基于地基实际应力状态的堤防极限平衡分析  

Ultimate equilibrium analysis of embankment based on actual stress states of soil foundation

作　　者：李春意 曾甄 温晓贵[1,2] 蒋熠诚 邢恩达 周建[1,2] LI Chun-yi;ZENG Zhen;WEN Xiao-gui;JIANG Yi-cheng;XING En-da;ZHOU Jian(Research Center of Coastal and Urban Geotechnical Engineering,Zhejiang University,Hangzhou 310058,Zhejiang,China;Engineering Research Center of Urban Underground Development of Zhejiang Province,Zhejiang University,Hangzhou 310058,Zhejiang,China;Zhejiang Design Institute of Water Conservancy&Hydro-Electric Power Co.,Ltd.,Hangzhou 310002,Zhejiang,China)

机构地区：[1]浙江大学滨海和城市岩土工程研究中心,浙江杭州310058 [2]浙江大学浙江省城市地下空间开发工程技术研究中心,浙江杭州310058 [3]浙江省水利水电勘测设计院有限责任公司,浙江杭州310002

出　　处：《地基处理》2024年第2期107-115,共9页Journal of Ground Improvement

基　　金：浙江省水利厅科技项目(RA2012)。

摘　　要：基于软土地基上筑堤对土体强度的影响,有效固结应力法以竖向附加应力计算土体的抗剪强度增量,因其简单实用已较多应用于软土地基稳定性分析中。该方法假设堤防荷载下土体处于K_(0)应力状态,与土体实际所受单向应力状态不符;基于该法的稳定性计算方法还忽略了剪应力变化及坡脚外侧区域对稳定性的影响。本文从土体抗剪强度和堤防稳定性分析两个层面改进有效固结应力法:通过应力状态分析得到基于实际应力状态的剪应力和抗剪强度变化,进而将各个区域的抗滑力矩和滑动力矩纳入稳定性分析体系。假想算例与工程实例分析表明,改进方法得到的安全系数大于有效固结应力法,更加符合工程实际。Based on the influence of embankment construction on soil strength on soft soil foundation,the effective consolidation stress method calculates the increase in shear strength of soil using vertical superimposed stress.Due to its simplicity and practicality,it has been widely used in stability analysis of soft soil foundation.This method assumes that the soil is in the 0K condition stress state under the embankment load,which is inconsistent with the actual stress state of the soil.The stability calculation method based on it also ignores the influence of shear stress changes and the outer area of the slope foot on stability.In this work,the effective consolidation stress method was improved from two aspects:shear strength and stability safety factor calculation.Initially,changes in shear stress and shear strength based on the actual stress state are determined through stress state analysis.Subsequently,the anti-sliding moment and sliding moment of each area were integrated into the stability analysis system.The case analysis shows that the results of the improved method surpass those of the effective consolidation stress method and align more closely with the engineering reality.

关 键 词：软土地基 堤防 附加应力 稳定性分析 有效固结应力法 不等向固结 

分 类 号：TU447[建筑科学—岩土工程]