Experimental study on influences of local failure on steel-strutted pile retaining system of deep excavations
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摘要: 国内外基坑坍塌事故时有发生,其中不乏采用钢支撑排桩支护结构体系的基坑。由于该类基坑支护结构受力特征较为复杂,其支护结构局部破坏对基坑整体安全性能及其引发连续破坏机理尚缺乏研究。设计了带水平支撑的排桩支护基坑局部破坏模型试验,研究了支护桩或支撑局部变形过大或局部破坏对土压力、支撑轴力和桩身内力等的影响。结果表明基坑排桩发生局部变形过大和局部破坏时,引起的土压力重分布对支护结构内力的影响规律与悬臂式排桩支护结构的影响有较大区别,可引起邻近初始破坏区域的支护桩产生更大的附加内力;当支撑发生失效后,失效支撑释放的荷载无法相对均衡的转移至邻近多根未失效支撑上,而是集中作用在最近的某几根支撑上,可引发支撑的连续破坏。Abstract: Excavation collapses occur frequently, including the excavations supported by steel-braced retaining system. Due to the complex mechanics characteristics of the retaining structures, the influences of partial failures on the overall safety performance and progressive collapse mechanism of the retaining structures have not been studied. The model tests on the partial collapses caused by the breakage of retaining piles or struts are designed in this study, and the influences of partial failure or excessive large deformation of piles or struts on the earth pressures and internal forces in piles and struts are studied. When the partial failure or large deformation occurs in retaining piles, the influences of consequent soil pressure redistribution on the internal forces of the retaining structures in braced retaining system are different from those in cantilever retaining system, which causes greater additional internal force in braced retaining structures. When the struts are failed, the released loads will be intensively transferred to most adjacent struts rather than uniformly transferred to a large number of struts, which will easily trigger the progressive failure in struts.
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Keywords:
- excavation /
- horizontal strut /
- partial failure /
- large deformation /
- load transfer
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