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Reliving Forecasting Theory to the "key Position" of a Huge Ancient Landslide Body
Manchao, He (China University Of Geosciences (Beijing),Beijing Campus, China University Of Mining And Technology) | Xiong, Wu (Beijing Campus,China University Of Mining And Technology) | Xiaoming, Sun (Beijing Campus,China University Of Mining And Technology) | Zhaoyang, Heng (Beijing Campus,China University Of Mining And Technology)
ABSTRACT: This paper aims at reliving essential of huge ancient landslide bodies ill the reservoir area of the Three Gorge and puts forward a new concept of the "Key Position" or huge ancient landslide bodies. On the basis or the study on macro, micromesh, and microcosmic geology characters of deforming cracks, the authors present the reliving forecasting theory and method of the "Key Position" of huge ancient landslide bodies and predicts the reliving the "Key Position" of the HUANGTUPO huge ancient landslide body from spatial and temporal view. I. PREFACE "The successful key of the Three Gorge Project is emigration project". Because or peculiar geological envlronment, there are lots of huge ancient landslide bodies in the reservoir area of the Three Gorge, for example, the volume of SHANGXINGPING huge ancient landslide body In WUSHAN County reaches one hundred and twenty millions m, the volume of HUANGTUPO huge ancient landslide body in BADONG County reaches forty millions m. These huge ancient landslide bodies have always been used to construct the new towns, and their reliving disturbed by various factors bring a difficult problem to the emigration project, for instance, it brought great losses to the people' lives and properties in BADONG County that the height section from 150m-210m of the second ditch and below eIevation 170m of the third ditch in HUANGTUPO new site failed in 1995. So how to forecast the reliving of huge ancient landslide bodies from spatial and temporal view is concerned of success or failure of the Three Gorge Project. 2. THE CONCEPT OF THE "KEY POSITION" Because its volume is huge and its formed age is ancient, a huge ancient landslide body has "super-stability" and "stress restoring" effect which cause mechanics parameters of the sliding zone increasing, so, the total landslide body is not able to relive. But the partial area of a huge ancient landslide body caused by natural and man-made factors (earthquake, rainfall, excavating, loading, reservoir impounding,) begins to deform, break primarily and it can conduce to more area of the huge ancient landslide body to fail. This kind of area is called as "Key Position" of a huge ancient landslide body (He Manchao, 1997). If this area is not able to fail, the other parts of the huge ancient landslide body will be limited to be stable. This is also the reliving essential of a huge ancient landslide body. Hence, the reliving forecasting research to of a huge ancient landslide body in the reservoir area of the Three Gorge, is scientific, reasonable and feasible, focus on the "Key Position". 3. THE RELIVING FORECASTING THEORY OF THE "KEY POSITION" According to the words above the "Key Position" always lies on the place where the damaged degree of rock mass is high and joints and cracks are more developed in a huge ancient landslide body. So, forms the basis and precondition of the reliving forecasting theory of the "Key Position" of a huge ancient landslide body. (The research focuses on the joints.)
Study of Models of Stability Reliability For Surrounding-rock In Underground Roadway
Manchao, He (Beijing Campus, Geotechnical engineering research institute of china university of mining & technology) | Yonghua, Su (Beijing Campus, Geotechnical engineering research institute of china university of mining & technology) | Xiaoming, Sun (Beijing Campus, Geotechnical engineering research institute of china university of mining & technology) | Aijun, Yao (Beijing Campus, Geotechnical engineering research institute of china university of mining & technology)
ABSTRACT: Due to complexity of soil rock itself and an environment in which soil rock lies, there are a lot of stochastic elements concerning with stability of surrounding rock for underground roadway that lies in soil rock. It is necessary to study stability reliability degree for surrounding rock of the roadway in soft rock based on design methods of safety coefficient. A key issue that must be solved is how to establish a model to calculate reliability degree while reliability analysis was done. Based on stress distributing mechanics of surrounding rock of underground roadway and characteristics of soft rock in itself, calculation methods for resistance force and load of surrounding rock of underground roadway lied in soft rock that was supported by shotcrete and rockbolt were researched while mechanical media of the son rock were belonging to layered structure mechanical media and approximately continuous media respectively. One model was verified by an example. I. INTRODUCTION Research on son rock issue always is one focus in geotechnic engineering area. Due to complexity of various physics and mechanics characteristics of soft rock, there are a lot of arguments on definition and classification of soft rock since a long time ago. Based on synthetically researched results on various definition and physical & mechanical characteristics, especially the mechanics of deformation of soil rock, kinds of soft rock was classified into geological and engineering soft rock after essential characteristics of soft rock was grasped in literature[¹] in the later of 90s'. The engineering soft is a engineering rock mass that can arises large plastic deformation while a engineering force was acted on it. There is uncertain in their physical and mechanical parameters. Mechanical behaviors of surrounding rock of underground engineering in soft rock are more complex than in ordinary rock-mass. Mechanical behaviors of the former arise non - linear characteristic. Non-linear mechanical design methods must be adopted in their design theory. While the underground engineering is devised, besides carrying out certainty analysis, it is necessary to adopt reliability analysis methods that will express stability degree by probability to take into the randomness of mechanical parameters and behaviors. 2. BASIC STOCHASTIC ELEMENTS OF UNDER-GROUND ENGINEERING IN SOFT ROCK Stochastic elements of underground engineering in soft rock radically have two kinds, namely components, physical & mechanical parameters and deformation principle of soil rock. 2.1 Randomness of physical and mechanical parameters The component of soft rock concerns with slime. Its main components are slimy minerals, including Kaolinite, Montmorillonite, Illite. Based on engineering experience in a coal mine, variability of contents for slime in soft rock is very much remarkable at different area in the same project and strata. Slimy mineral is main element that influences mechanical characteristic of soft rock. The variability of contents for slimy mineral is one element that results in the variability of mechanical characteristics for soft rock. For example, it is found that average content for slimy mineral of soft rock in different area of a project for one coal mine.
- Geology > Mineral > Silicate > Phyllosilicate (0.88)
- Geology > Rock Type > Sedimentary Rock (0.69)
- Materials > Metals & Mining (0.55)
- Energy > Oil & Gas > Upstream (0.54)