基于HSS模型预测基坑开挖影响下的管线安全性分析

Safety Analysis for Excavation-induced Impact on Surrounding Pipelines Based on an HSS Model

随着城市建设发展的加速,基坑工程朝着深基坑的方向发展,工程面临的周围环境也变得越来越复杂。结合常州地区某地铁基坑工程,基于Plaxis2D采用小应变土体硬化(HSS)模型对基坑开挖过程进行数值模拟,同时分析了基坑开挖对基坑周围地下管线的影响。通过对基坑支护体系的墙后位移数值结果与实测结果的对比,验证了模型的适用性。最后采用数值模拟的管线沉降,对受影响的管线安全性预测进行简化分析。

With the rapid development urban construction,foundation engineering is heading towards deep foundation engineering.The surrounding environment of deep foundation thus becomes increasingly complex.Base on the Plaxis 2D, the hardening soil small（HSS） model was used in simulation of a deep foundation in Changzhou subway construction to study the transformation of underground pipeline influenced by the excavation.By comparing simulation results with the actual measurement, the modal＇ s applicability was verified.At last,based on simulated results of pipelines settlement,a simplified analytical method was put forward for safety analysis for excavation-induced impact on surrounding pipelines.