湿陷性黄土基坑施工风险预测与应用研究  

Risk Prediction and Application Research of Collapsible Loess Foundation Excavation Construction

作　　者：王迪 邓洪亮[1] 马岩 李萌萌 WANG Di;DENG Hongliang;MA Yan;LI Mengmeng(School of Architecture Engineering,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学建筑工程学院,北京100124

出　　处：《施工技术》2020年第1期7-10,15,共5页Construction Technology

基　　金：国家自然基金重点项目:城市地铁施工安全风险动态分析与控制(12004014201501);北京市自然基金重点项目:城市地铁施工关键技术基础研究(Z1004014201601)。

摘　　要：以某工程为例,采用有限元数值分析方法,对黄土湿陷前后两种状态进行数值计算和对比分析,结果表明,天然状态黄土具有较高的抗剪强度和承载力,地表沉降和水平位移较小,当浸水湿陷后,黄土结构产生破坏,承载力快速衰减,边坡产生较大的沉降和位移,严重影响基坑安全。根据现场监测数据与计算结果对比分析,说明采用数值计算方法可以有效预测湿陷性黄土基坑施工中的风险。This paper takes a project as an example and adopts the method of finite element numerical analysis. The numerical calculation and comparative analysis of the two states before and after the loess collapsing show that the natural loess has high shear strength and bearing capacity,and the surface settlement and horizontal displacement are small. When the immersion water collides, the loess structure is destroyed. The bearing capacity is rapidly attenuated, and the slope produces large settlement and displacement,which seriously affects the safety of the foundation excavation. According to the comparison of on-site monitoring data and calculation results,it is shown that the numerical calculation method can effectively predict the risk in the construction of collapsible loess foundation excavation.

关 键 词：基坑 湿陷性黄土 数值分析 监测 风险预测 

分 类 号：TU753[建筑科学—建筑技术科学]