长江科学院院报Issue(4)：101-108,8.DOI:10.3969/j.issn.1001-5485.2015.04.020
外坑支护结构转动时坑间被动区土拱效应分析
Soil Arching Effect in the Passive Zone Between Internal Pit and External Pit When the Outer Supporting Structure Rotates
摘要
Abstract
The soil arching effect in the passive zone between the internal pit and external foundation pit was ana-lysed based on the stress and deformation features of supporting structure.A formula of passive soil pressure is es-tablished by using the theory of soil arching effect when the supporting structure of the external pit rotates around the bottom.A conception of the relative displacement ratio is put forward to describe the change of earth pressure in the external pit when the structure of the internal pit has displacement.The calculated earth pressure is nonlinear. The calculation results of engineering example prove that the method in this research could better reflect the impact of soil arching effect and pit-to-pit distance on earth pressure than classical methods.It also shows that this new method is safer than Coulomb’s earth theory when designing the supporting structures.When there is no displace-ment of the internal pit supporting,the smaller distance between two pits,the bigger relative displacement ratio of supporting structures and the bigger passive earth pressure will be,which means that improving the interior support-ing stiffness is beneficial to controlling the deformation of the external pit supporting.关键词
坑中坑/土拱效应/基坑/被动土压力/相对位移比Key words
pit in foundation pit/soil arching effect/foundation pit/passive soil pressure/relative displacement ratio分类
建筑与水利引用本文复制引用
胡辉,汤连生,林兴立,匡飞..外坑支护结构转动时坑间被动区土拱效应分析[J].长江科学院院报,2015,(4):101-108,8.基金项目
国家自然科学基金项目（41472279，40872205）；全国高等学校博士学科专项科研基金项目（20120171110031）；广东省自然科学基金项目（07003738，S2012040007331）；广东省科技计划联合资助项目 （）
