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Fuzhou
ABSTRACT The strait section of second phase water supply project in Changxing Island Port Industrial Zone is the control section of the whole project. Since the waterline stretches across the Fuzhou Strait, cofferdam construction was employed in engineering. In this paper, the engineering situation and the geological conditions in situ were fully considered when analyzing. First, the form of cofferdam that should be adopted was specified by comparison, meanwhile, the construction technology was selected. Thus, a construction scheme was put forwarded which included the form of earth-rock fill cofferdam and the construction technology that used riprap material with layered rolling compaction. Second, on the basis of strength reduction method, the cofferdam cross sections of choice were analyzed in FLAC2D through comparing the one with a counter-weight platform and that without a platform. It turned out that the former can distinctly increase the security coefficient of the cofferdam; therefore the profile with a platform was adopted. Finally, the dam crest width and slope ratio and other section geometrical parameters were optimized in Ansys, in this way, the optimized cross-section dimensions were determined. Afterwards, import the result data into FLAC3D in order to verify the rationality and security of the plan. In addition, combined site construction and economy factors, some further rational suggestions were proposed.
changxing island port industrial zone, coefficient, cofferdam, construction technology, cross section, earth-rock fill cofferdam, Engineering, flow in porous media, Fluid Dynamics, layered rolling compaction, Midstream Oil & Gas, platform, renewable energy, stability, Strength Reduction Method, water level, water management
Industry:
- Construction & Engineering (1.00)
- Water & Waste Management > Water Management > Water Supplies & Services (0.49)
- Energy > Oil & Gas > Midstream (0.46)
SPE Disciplines:
ABSTRACT: The technique of a soil nailed wall in a soft soil area for deep excavation was developed in this paper. Soil nailed walls are generally used to reinforce clay, residual soil, sand and angular soil etc. In recent years, they have been adopted for deep excavations by reinforcing soft soil such as muck and mucky clay. The design method of a soil nailed wall on excavations in a soft soil area is presented. The mechanism of the structure and retaining effect is analyzed. A case history for a depth of excavation is 5.0m is presented. If the capacity of foundation pit basal soil is low, vertical strengthening needs to be introduced. These retaining structures can be used for the excavation in depths of 3m-7m soft soil areas. INTRODUCTION Fuzhou is a soft soil area that is located on the southeast coast of China. During this decade, many new high-rise buildings have been constructed. Generally 1 or 2 levels of basements are common for high-rise buildings, and excavation depth is 3.5m–10m. The retaining and protecting for excavations of deep foundation pit therefore becomes more important. The technique of a soil nailed wall (also named combined shotcrete-anchorage-netting reinforcement technique in local area) is the slope retaining technique that the soil nail is the main force structure and is installed across the potential failure surface. It consists of in-situ stabilized soil body, a shotcrete facing and necessary waterproof system. The retained soil mass is drilled and a steel bar or steel pipe is put into the drill hole and grouting is used 1 or 2 times. Steel mesh is then installed and concrete facing is sprayed to make the soil nail and shotcrete facing a bond. It was previously considered not suitable for use on soft soil ground.
ABSTRACT: This paper describes full-scale test on five large bored piles with grouted end in Fuzhou, southeast coast of China. Test program included site investigation, pile installation and end grouting. The piles were instrumented with strain gages and load cells to identify load distribution in the piles. The piles were tested under a vertical load of 9 MN that is limit load for shaft material. Test results showed that end grouting improves load-settlement performance of bored pile. The ultimate load of the test pile was estimated to be higher than the maximum test load. Pile shaft resistance carried the most portion of the applied load. Less than 10% of the applied load transferred to the end. End grouting significantly increases the shaft resistance near the pile end. INTRODUCTION Fuzhou is located on the southeast coast of China. Most areas of subgrade in this district are soft soil of resent fluvio-maring sediment. Large diameter bored piles are commonly used as foundation for multistory buildings in Fuzhou. These piles are normally founded on bedrock in order to guarantee high end bearing capacity and low settlement under working load. The rock socketed piles are mostly long shaft piles because bedrock lies deeply under the ground in Fuzhou. Such piles are not only difficult but also cost to be constructed. Furthermore, case studies showed that load-settlement behavior of such piles was often not satisfied the requirement of heavily loaded building. Research on load transfer behavior of bored piles in Fuzhou indicated those end faults sharply decrease the total bearing capacity of the piles. Grouting was always suggested to treat the end faults and to improve the end condition of large bored piles. This paper describes a case study of large bored pile with grouted end for an actual project in Fuzhou.
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