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Guangxi
Curie point depth estimates based on spectrum analysis from aeromagnetic data in Guangxi Province, China
Zhi, Jianli (Hubei Subsurface Multi-scale Imaging Key Laboratory, Institute of Geophysics and Geomatics, China University of Geosciences) | Liang, Qing (Hubei Subsurface Multi-scale Imaging Key Laboratory, Institute of Geophysics and Geomatics, China University of Geosciences) | Liu, Yiming (Hubei Subsurface Multi-scale Imaging Key Laboratory, Institute of Geophysics and Geomatics, China University of Geosciences) | Chen, Chao (Hubei Subsurface Multi-scale Imaging Key Laboratory, Institute of Geophysics and Geomatics, China University of Geosciences) | Li, Hailong (Guangxi Academy of Geophysical Exploration, China) | Du, Jinsong (Hubei Subsurface Multi-scale Imaging Key Laboratory, Institute of Geophysics and Geomatics, China University of Geosciences)
ABSTRACT The Guangxi province is considered as a unique region in southeastern China due to its geographical location, tectonic and thermal activities. It is located geographically at the crossroads of Yangtze plate and Cathaysia landmass constituting a collision zone between the two blocks. In this study, we aim to further understand the lithospheric magnetic structure, thermal activity, and seismicity through mapping the Curie point depth (CPD) for Guangxi. The CPD are obtained by the method of power-density spectrum analysis based on the aeromagnetic anomaly data. Results of this study indicate that the CPD of Guangxi at a depth of 19~40 km (indicate that the CPD over the study region ranges from 19 km to 40 km). We found a weakly negative nonlinear correlation between the CPD and heat flow. The Curie isotherm generally lies above the Moho in this region but deepens into the mantle in some locations, notably beneath the middle of Guangxi. Earthquakes concentrated in the concave field and transition band of the CPD. The distribution of faults and igneous rocks have significant influences on the CPD. Presentation Date: Monday, October 15, 2018 Start Time: 1:50:00 PM Location: Poster Station 9 Presentation Type: Poster
SEG-2018-2998449
Country:
- Asia > Middle East > Saudi Arabia (1.00)
- Africa > Middle East > Egypt (1.00)
- Asia > Middle East > Yemen (0.93)
- (2 more...)
Geologic Time:
- Phanerozoic > Cenozoic (0.47)
- Phanerozoic > Mesozoic (0.47)
SPE Disciplines: Reservoir Description and Dynamics > Reservoir Characterization > Exploration, development, structural geology (1.00)
ABSTRACT Sedimentary phase in Nanning, Guangxi, P.R. China were formed in paleoclimatic sequence of arid, semiarid, humid, semi-humid, semiarid, and semi-humid, etc.As a result of ancient atmosphere circumstance evolution, weak consolidation becomes an important property of the gray lagoon deposited mudstone layers in the Nanning Basin. On the other hand, it is difficult to divide the categories for a weathered soft rock, which may be affected by the sedimentary formation of soft and hard interbed alternately. Categorizing weathered soft rock largely depends on the experiences of engineers. There is a significant lack of knowledge in categorizing soft rock during site investigation because soft rock cannot be kept intact during drilling borehole. Mudstone is considered as a typical soft rockwhich is in an intergradation between rock and soil. It is very important to find a simple, convenient and feasible method to judge the borderline of distinguishing between ‘rock’ and ‘soil’ for mudstone. In this study, mudstone stability subject to water will be taken as the standard evaluation method of the borderline between rock and soil, the experimental results show that the method is applicable in practical engineering. 1 INTRODUCTION 1.1 History of depositional evolution Area of the Nanning basin is approximately 948 square kilometers. It is the system of Gary's fold in the southeast of China located on the compound upheaval belt, namely, a raising belt of the earth's crust, of the early Paleozoic era and the late Paleozoic era in the DaMing mountain-Kunlun Mountains. It has an asymmetrical wedge-shape. The Nanning basin is separated as NW-SE NaLong hollow and NE-EW BeiHu hollow by Yangmei basin protuberance in the middle of basin. BeiHu hollow is an irregular diamond shaped fault basin, which is steeply inclined along the north plane of the fault and is sloped gently along the south plane. The basin subsidence had controlled by the fault in the northern margins of the basin, the southern plane of the fault is a flat belt of a slope. The majority of materials of the Cainozoic era sedimentary origin in the Nanning basin comes from the northern and western direction of the basin, while the secondary sedimentary origin were provided by the northern and southern direction in the basin. The two directions to the north and west are the far sedimentary origin rivers delta sedimentary phase, the down-throw side of the fault in the northern margin of the basin is a fan-shaped delta sedimentary phase and that in the southern margin of basin is nearly a sedimentary origin river delta sedimentary phase. The BeiHu hollow is divided into six large sedimentary phases, i.e.,Dry alluvial fan-shaped sedimentary phase, Wet alluvial fan-shaped sedimentary phase, Fan-shaped delta sedimentary phase, Delta sedimentary phase, Normal lacustrine sedimentary phase. Salty lacustrine sedimentary phase. The depositional phases were influenced by the palaeo-structure topography, palaeoclimatology, sedimentary origin and palaeo-hydrology, etc., which indicates obviously regional, inheritable and gradual characteristics.
Industry:
- Energy > Oil & Gas > Upstream (0.48)
- Construction & Engineering (0.47)
Acoustic Emission of Limestone In Uniaxial Compression Test
Qiang, Xie (Faculty of civil Engineering, Chongqing University) | Yong-Xing, Zhang (Faculty of civil Engineering, Chongqing University) | Xian-Bin, Yu (Department of Resource Exploitation Engineering, Kunming University of Science and Technology) | Jian-Hua, Zhang (Faculty of Civil Engineering. Chongqing University) | Chao, Guo (Faculty of Civil Engineering. Chongqing University) | Tai-Liang, Du (Faculty of Civil Engineering. Chongqing University)
ABSTRACT In order to study the acoustic emission of rock when subjected to compressive loads, some uniaxial compression tests on a kind of limestone of Guangxi Province were carried out by means of the Rock Acoustic Parameter Dynamic Testing System (RAPDTS). It was concluded that the formations of new micro clefts generated in the rock and the enlargements of existing clefts are the principal factors that cause the acoustic emission. INSTRUCTIONS Acoustic Emission Technique has been widely used in Geotechnical Engineering. It plays an important role in Rock Mechanics research. Acoustic Emission Technique is a testing method to inspect inner status and to grip the mechanical behaviors of rock by means of rock acoustic emission. When rock is under compressive stress, stress concentrates around the pre-existing or new-produced micro clefs, and the strain energy also increases. When outside force increases to a certain value, microcosmic yielding and distortion occur in the region with flaws in rock. Clefts expand and the Stress relaxes. Some strain energy releases as an elastic wave (Sound wave). That calls rock's Acoustic Emission (AE). The inner status of rock can be found out by observation and analysis of rock acoustic emission. It is an inverse problem to probe the changes of rock property and status with Acoustic Emission Technique. so study on acoustic emission of rock in laboratory is essential for inverse analysis of rock's properties in nature. As a kind of elastic wave, the signal of Acoustic Emission not only can reveal rock's properties, but also reflect properties of spreading and receiving easily. So monitoring system with AE has the advantages of high -speed, large-scale of monitoring, long-term and dynamic monitoring. Early in the end of 20 century, engineers of bureau of mines of USA, Obert and Duvall detected the AE activity in rock when to load on rock structure. And a series of indoor tests and field tests indicate that AE is a measurement of rock and it's stability of mechanical structure. At the present time, AE technique has been widely adopted for stability monitoring in underground stope, goaf, slope in the open air and foundation of the dam, and also used in petroleum engineering, seismological engineering, underground engineering and etc. STUDIES ON AE PROPERTIES OF ROCK Rock Acoustic Parameter Dynamic Testing System (RAPDTS) The rock AE is a signal of transient random wave whose rise time is just scores of or several hundreds of millimicroseconds and whose repetition frequency is also high. The transient vertical displacement is about 10 ~ 10 m. The frequency distributes in the range from infrasound to ultrasonic, i.e. from several HZ to scores of HZ. It demands that the AE monitoring system has properties of high speed of response, high sensitivity, high gain, wide dynamic scope, resumption from high block and choosing the frequency in the monitoring windows.
SPE Disciplines:
ABSTRACT: Based on centrifugal model tests on expansive soil railway embankments in Nanning-Kunming railway in south China•this paper studied varied stress and formation states of the embankment under different physical conditions, the centrifugal tests show that it is most important to control the compactness of embankment; considering the maximum settlement of the embankments cannot exceed 30 centermeter, limit height of embankment made of expansive soil is 15 meter. In road embankment design, 34°can be the slope angle. Compactness should be controlled at 90%. Safety measure must be taken to protect the slope from rain. INTRODUCTION In civil engineering, stress caused by soil gravity is the most important, mechanical characteristic varies with stress condition. Normal small-scale model cannot represent specialty of prototype due to small deadweight; to settle the problem, enhance the deadweight is the only approach. Laboratory test could describe the complexity of soil, if combined with field observation, centrifugal test can be a useful tool in civil engineering. Since 1980's, much effort has been put in this field in China. More attention is attracted in Geotechnical centrifugal model testing, its research results promote basic theories of soil mechanics, and are used in dock engineering, nuclear power station, high dam construction, high road embankment and high retaining wall. EXPANSIVE SOIL IN NANNING-KUNMING RAILWAY IN SOUTH CHINA There are almost 100 km2 expansive rock areas in Nanning-Kunming railway. It is forced to use this material to fill embankments. But the strength of the expansive rock is low, the average cohesion of triaxial shear test is 32.3 kpa, and inner friction angle is 8.1°with high swelling potential, the expansive rocks have a free expansion ratio of 75%—93%, expansion force is 367.5 kpa. Centrifuge model tests are carried on three different stress-strain conditions.
centrifugal test, compactness, displacement, embankment, embankment slope, engineering property, expansive rock, expansive soil, fissure, friction angle, gravitational stress, ground transportation, kPa, moisture content, nanning-kunming railway, rail transportation, rainfall, settlement, slope angle, southwest jiaotong university, strength
Industry:
- Transportation > Ground > Rail (0.98)
- Energy > Power Industry > Utilities > Nuclear (0.54)
ABSTRACT This paper presents an application of a patent technique (the patent number is ZL94 20404.2 in China) called Fan Weathervane Multi-point Counterweight Mooring (FWMCM). The feature of the technique is to apply the weathervane effect of the single point mooring system and additionally install the counterweight to conventional multi-point mooring system to reduce the mooring load and the occupied water-area. This new system may be utilized even in severely limited water-area for discharging of product oil and liquid goods economically. The FWMCM system technique had been utilized in a engineering project at Long Men Harbor in Qinzhou Bay, Guangxi province, China, which was an ideal selection for this project. There were two oil transfer terminals that adopted the type of FWMCM system in this project; one is for 50,000-ton terminal with 4 million-ton annual transfer capacity, and the other is 20,000-ton terminal with 3 million-ton annual transfer capacity. Computer simulation and tank model tests had been carried out, the results had shown that the FWMCM system was a novel and advanced mooring system. INTRODUCTION The traditional fix jetty dock were mostly utilized to handling oil storage before the appearance of the single point mooring system in late 1950s in the field of large terminal of oil storage and handling in the sea. Nevertheless, the conventional multi-point mooring system technique is still an choice for mooring systems in the sea. The Traditional fix jetty scheme has the advantages of being direct connection between the jetty and the tanker, convenience in transportation and operation, but it suffers from the defects of being large investment, long construction period and poor stand capability to environment loads. The single point mooring system has the characteristic of weathervane, which always keeps the moored oil tanker at the least combined load position in wind, waves and current.
SPE Disciplines: Facilities Design, Construction and Operation > Offshore Facilities and Subsea Systems > Mooring systems (1.00)
The Brittle Failure of Rock Around Underground Openings
Jiayou, Lu (Institute of water Conservancy and Hydroelectric Power Research, Beijing, People's Republic of China) | Lihui, Du (Institute of water Conservancy and Hydroelectric Power Research, Beijing, People's Republic of China) | Chengjie, Zou (Surveying and Designing Institute, Guiyang Ministry of Water Conservancy and Hydroelectric Power, Guiyang, People's Republic of China) | Zebin, Wang (Surveying and Designing Institute, Guiyang Ministry of Water Conservancy and Hydroelectric Power, Guiyang, People's Republic of China)
ABSTRACT: This paper describes the rockburst phenomena around circular tunnels excavated in limestone formation; analyses the failure mechanism of surrounding rock of the tunnel caused by rockburst, the stress condition leading to rockburst and the relation between rockburst intensity and stress state; indicates the possibility of predicting the occurrence and intensity of rockbursts using FEM on the basis of the above analysis and gives an engineering case. 1 INTRODUCTION The Tianshengqiao two stage hydropower station is situated in the lower reaches of the Nanpanjiang River at the juncture of Guizhou and Guangxi provinces in the Southwest of China. It has a low dam, long headrace tunnels and an installed capacity of 1.32 million kilowatts. The three tunnels are straight, each has a length of 10 km, and run parallel to one another in the river bend area on the right bank (Fig. 1). The tunnels are excavated by TBM and drilling-and-blasting method. Three construction adits are excavated among which the adit no. 2 is located at the transitional part of Nila anticline and Zhongshanbao syncline with its axis subparallel to the fold and has a length of about 1.3 km. The adit no. 2 and a part of the tunnel in limestone formation upstream from it are constructed by TBM while the others by drilling-and- blasting method. The adit no. 2 constructed by TBM is circular in cross section and 10m in diameter, just like the tunnels. The average buried depth is about 400m, with a maximum of 760m. The tunnel line runs through an area of limestone and dolomitic limestone in the upper reaches of Yachagou Brook (Fig. 2). The compressive strength of limestones ranges from 60 to 100 MPa. This segment of tunnel line is about 7 km long and is rockburst prone. In the lower reaches of Yachagou Brook, the formation consists of sandy shale which is fractured and no rockburst occurred there. The main geological structure is the Nila anticline with its trend turning from NWW to NE in this area. Palaeotectonic stress field in this area is perpendicular to the anticline axis while the present one acts in NW-SE direction. In the valley area of Nila anticline and the edit no. 2, geostresses are measured at the points shown in Fig.l. 2 ROCKBURST PHENOMENA OBSERVED IN-SITU Rockburst occurred first at the roof and floor of edit no. 2 at a buried depth of about 200–250m, and then in the major tunnel in limestone many times. In edit no. 2, the extent and depth of failure in the surrounding rock and burst intensity increase with increasing buried depth of the edit. The observed data show that the initial stress in rock mass is not necessarily the gravitational stress field. Therefore, the dip angle of principal stress in the rock mass in edit no. 2 can be inferred from the location of surrounding rock failure caused by rcckburst. Moreover, it is known that the rockburst intensity is related to the magnitude of stress.
adit, boundary, Computation, criterion, failure zone, fracture, Griffith criterion, intensity, low stress, mechanism, microcrack, propagation, Reservoir Characterization, rock fracture, rock mass, rock specimen, rockburst, stress state, structural geology, tunnel, ultimate failure, Upstream Oil & Gas
SPE Disciplines: Reservoir Description and Dynamics > Reservoir Characterization > Exploration, development, structural geology (1.00)
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