坑中坑基坑支护的整体稳定性数值分析

发布时间：2018-03-12 18:29

本文选题：强度折减法　切入点：有限元　出处：《扬州大学学报(自然科学版)》2014年04期 　论文类型：期刊论文

【摘要】：采用强度折减与有限元相结合的方法对内外坑相互间的影响及因素进行弹塑性分析,研究了坑中坑的破坏失稳机制.结果表明:1)如果存在坑中坑,被动土压力则会减小,是被动区土体卸载和部分土体转变为主动区而造成的.2)外坑支护计算时必须考虑内坑对外坑的影响,若内坑处于2.0~2.7倍内坑开挖深度范围内,基坑设计时须对外坑的被动土压力进行折减;若在4.5~5.0倍内坑开挖深度范围内,仍须考虑内坑对整体安全系数的影响;若在4.5~5.0倍内坑开挖深度范围外,则可对内、外坑单独设计.3)严格控制内坑的开挖深度,内外坑深度比大于0.5时,应予以重视.
[Abstract]:By using the method of strength reduction and finite element analysis, the influence of internal and external pits and the factors affecting each other are analyzed. The failure and instability mechanism of the craters in the pits is studied. The results show that the passive earth pressure will be reduced if there is a hole in the pit. It is caused by the unloading of soil in passive zone and the transformation of part of soil into active zone. 2) the influence of the external pit of the inner pit must be taken into account in the calculation of external pit support, if the inside pit is within the range of 2.0 or 2.7 times the depth of the excavation of the inner pit, The passive earth pressure of the external pit must be reduced in the design of the foundation pit; if the excavation depth of the inner pit is 4.550 times, the influence of the inner pit on the overall safety factor should still be considered; if the excavation depth of the pit is 4.55 times greater than that of the inner pit, the pit can be excavated internally. The excavation depth of the inner pit is strictly controlled. When the depth ratio of the inside and outside pit is greater than 0.5, attention should be paid to it.
【作者单位】：扬州大学建筑科学与工程学院;江苏省地质矿产局第一地质大队;
【基金】：国家自然科学基金资助项目(50908198)
【分类号】：TU470

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