建筑荷载下土质洞室地基稳定性的数值分析

随着地面与地下空间的综合开发利用日趋增多,地面建筑与地下工程的冲突及由此所引发的灾害也日益增多。如在既有洞室上修建建筑(开洞地基)或在既有建筑下开挖地下洞室(地基开洞)所引起的地下洞室有害变形及地基破坏,已成为地面与地下工程建设中亟待解决的突出问题。为此,本文结合工程实例,基于大型有限元软件ABAQU S,采用加载系数法和强度折减法,分别对开洞地基与地基开洞后建筑物下土质洞室地基的破坏过程与整体稳定性进行了有限元数值模拟;在此基础上,针对不同的地面加载方式与洞室埋深,采用强度折减法与加载系数法对开洞地基开展了弹塑性有限元数值计算与分析,得出了一些规律性认识,以期为相关工程建设及地下工程防灾减灾提供参考。

Numerical Analysis of Stability of Soil Cave Ground below Building

With the rapid increase of comprehensive exploitation of ground and underground engineering,the conflict between ground building and underground engineering and the corresponding disasters are becoming more and more obvious,which has been widely concerned.For instance,the deformation and failure of foundation with caverns including the digging holes in ground and construction after digging holes have become an urgent and troublesome issue.In this paper,a case study is presented,in which the commercial FEM software ABAQUS combined with strength reduction factor approach and loading coefficient method is employed to simulate the failure process and analyze the overall stability of soil cave ground under building loads.Furthermore,numerical computation considering different ground loading modes and tunneling depths is carried out to investigate the stability of construction after digging of holes.Various curves are obtained and some laws are discussed to offer references for the pertinent engineering constructions and disaster prevention and mitigation in underground engineering.