刚性桩复合地基下伏溶洞安全性评估方法研究  

Research on the Safety of Karst Cave Roof under Rigid Pile Composite Foundation

作　　者：韩小雷[1,2] 陈岳川[1] 李耀琨[3] 季静[1,2] 贺锐波 

机构地区：[1]华南理工大学土木与交通学院,广州510640 [2]华南理工大学亚热带建筑科学国家重点实验室,广州510640 [3]中国国际工程咨询公司,北京100048 [4]广东名都设计有限公司,广州510640

出　　处：《广东土木与建筑》2017年第4期39-43,共5页Guangdong Architecture Civil Engineering

基　　金：华南理工大学亚热带建筑科学国家重点实验室重点研究项目(2015ZA05)

摘　　要：基于摩尔-库伦强度理论,提出通过比较平均附加竖向应力来评估溶洞顶板安全性的方法,即在施工阶段对局部桩基施加竖向荷载,使得溶洞顶板一定范围内产生的平均附加竖向应力大于等于建筑物建成后该范围内产生的平均附加竖向应力,得到需要施加的单位面积竖向荷载为建筑物正常状态下平均重量的倍数,据此评估溶洞顶板的安全性。文中给出了单位面积荷载倍数的定义,再通过计算和回归分析得到不同因素对其影响程度。Based on the Mohr-Coulomb criterion,a method of evaluating the safety of the karst cave roof by comparing the average additional vertical stress is proposed. The vertical load is applied to the local pile in the construction period,so that the average additional vertical stress is greater than or equal to the average additional vertical stress generated in a certain range after the completion of the building,the vertical load per unit area required to be applied is obtained as a multiple of the normal load of the building,to assess the roof safety. The definition of load multiple per unit area is given, and the influence of different factors on the load multiple is obtained by calculation and regression analysis.

关 键 词：刚性桩复合地基 溶洞安全性评估 静载试验 平均附加竖向应力 荷载倍数 

分 类 号：TU473.1[建筑科学—结构工程]