抗承压水基坑底板的临界厚度计算方法  

CALCULATING METHOD OF CRITICAL THICKNESS OF WATER-RESISTING LAYER IN ABRUPT GUSH PROBLEM OF FOUNDATION PIT

作　　者：朱朝辉[1] 吴平[1] 刘金龙[2] 姚华彦[1] 纪伟[1] 

机构地区：[1]合肥工业大学土木与水利工程学院,合肥230009 [2]合肥学院建筑工程系,合肥230022

出　　处：《工业建筑》2013年第S1期438-441,共4页Industrial Construction

基　　金：安徽省自然科学基金资助项目(No.1208085QE89)资助;高等学校博士学科点专项科研基金新教师基金(20100111120002);考虑空间效应的地基承载力理论与试验研究(51078123)

摘　　要：规范中的突涌分析方法仅考虑隔水层土重的影响,忽略了隔水层的土体抗剪强度对抵抗突涌的作用,计算结果往往与实际偏差较大.许多学者对此进行了改进,但大多假定基坑底部隔水层为均质线弹性梁(板)单元,这与实际有偏差.通过对基坑底板的受力平衡分析,考虑底板破坏时四周破坏面上土体抗剪强度的贡献,提出一种可以考虑土体抗剪强度的基坑突涌隔水层临界厚度简便计算公式。多个实例计算表明,根据该公式所得的计算结论与实际相符。In the correlative technical codes of China,only gravity of water-resisting layer of foundation pit has been considered in abrupt gush problem analysis,which ignored the effect of shear strength of soil,the result of this method is always disagree with reality.Some scholars try to amend this shortcoming,while the water-resisting layer of foundation pit is always assumed as a beam or plate which is a homogeneous element with linear elasticity,which is disagree with reality too.Based on force equilibrium analysis of water-resisting layer,a new simple formula for calculating critical thickness of water-resisting layer have been proposed in this article,the shear strength of soil has been calculated around failure surface.Some cases have been studied with the new formula,which indicated that the result of the new formula is coincident with realities.

关 键 词：基坑 隔水层 突涌 临界厚度 土体强度 

分 类 号：TU46[建筑科学—结构工程]