基坑局部超挖对周边支护结构的影响机理  

Influence mechanism of foundation pit partial over-excavation on surrounding supporting structure

作　　者：黄天明[1] 程雪松[1] 郑刚[1] 聂东清 刘杰[1] 邓楚涵[1] 

机构地区：[1]天津大学滨海土木工程结构与安全教育部重点实验室天津大学土木工程系,天津300072

出　　处：《中国港湾建设》2016年第4期1-5,共5页China Harbour Engineering

基　　金：国家自然科学基金(51508382);国家科技支撑计划课题(2012BAJ01B02-03);中国博士后科学基金资助项目(2014M561186)

摘　　要：虽然已有很多由局部超挖引起基坑大范围破坏的工程案例,但局部超挖对支护结构整体的影响却较少有深入研究。文中采用显式有限差分法,对不同条件下的基坑局部开挖进行了模拟。结果表明,局部开挖不仅会导致开挖范围内支护桩内力大幅增长,还会导致周边一定范围内支护桩内力增长。研究成果为坑中坑设计及基坑分区开挖等基坑局部深挖问题提供了参考。Although there are many extensive collapse cases of foundation pit that caused by partial excavation, deep study on the influence of partial over-excavation on supporting structure is less. We used the finite difference method to analyze the partial excavation in foundation pit in different condition. The results show that partial excavation can lead to significant increments of the internal forces of the piles in the excavation range, and can lead to increment of the internal forces of the adjacent piles. The result can offer some reference for the foundation pit partial over-excavation problems, which include the pits in foundation-pit design and partition excavation, etc.

关 键 词：基坑 局部超挖 基坑事故 有限差分法 

分 类 号：U655[交通运输工程—港口、海岸及近海工程] TU463[交通运输工程—船舶与海洋工程]