淤泥区狭长基坑抗隆起稳定性分析  

Study on Anti-heave Stability of Narrow-long Foundation Pit in Silt Area

作　　者：卢瀚 LU Han

机构地区：[1]上海市政工程设计研究总院(集团)有限公司,上海市200092

出　　处：《城市道桥与防洪》2022年第12期248-251,I0021,共5页Urban Roads Bridges & Flood Control

摘　　要：针对珠三角某综合管廊工程坑底土层为深厚淤泥的情况,采用有限元软件进行数值模拟,基于强度折减法对基坑破坏模式进行分析。计算结果表明:狭长类基坑破坏时,依旧表现为坑底产生较大的隆起变形,但呈现的滑动面会受到对侧支护桩约束影响,计算得到安全系数明显高于半无限体假定下的圆弧滑动结果,也更符合实际情况。现进一步分析了坑底加固深度、基坑宽度等对深厚淤泥类软土中狭长基坑坑底抗隆起稳定性的影响。其研究结果可为类似工程提供参考。Aiming at the situation that the soil layer at the bottom of the foundation pit in a utility tunnel project in Pearl River Delta is the deep and thick silt, the finite element software is used to carry out the numerical simulation. The failure mode of the foundation pit is analyzed by the strength reduction method.The calculation results show that the narrow-long foundation pit is still manifested as the greater heave deformation at bottom when damaged. But the sliding surface presented will be affected by the constraints of the opposite side supporting pile. The safety coefficient calculated is obviously higher than the circular slide result under the semi-infinite body assumption, and is also more realistic. The influences of the reinforcing depth of pit bottom and the width of foundation pit on the anti-heave stability at the bottom of narrow-long foundation pit are further analyzed. The study result can be referenced for the similar projects.

关 键 词：狭长基坑 深厚淤泥 抗隆起稳定性 强度折减法 HS模型 

分 类 号：TU753[建筑科学—建筑技术科学]