摘要
地下连续墙槽壁稳定是确保成槽安全及成槽质量的关键前提,为从理论上分析其整体失稳机制,建立了槽壁整体破坏滑动体模型,基于土体相关联流动法则及塑性极限破坏理论,采用极限平衡分析法,得到槽壁整体失稳的最小泥浆重度及安全系数计算方法,并从安全系数角度对比分析两种计算方法的参数敏感性,最后结合工程实例对两种泥浆重度计算方法进行对比分析和验证。研究结果表明:本文方法相较于常用方法更适用于黏土地层槽壁稳定性分析,且安全系数主要受槽段长度、泥浆重度、土体内摩擦角及泥浆水液面相对高差影响。实际成槽泥浆重度介于理论计算的控制范围之内,理论分析得到现场超声波检测验证,其结果可为今后地下连续墙成槽施工提供理论参考。
The stability of the trench of diaphragm wall is the key prerequisite to ensure the safety and quality of trenching construction.In order to analyze its overall instability mechanism theoretically,the overall failure sliding body model of the trench was established.Based on the soil-related flow law and the plastic limit failure theory,the limit equilibrium analysis method was used to obtain the calculation method of the minimum mud weight and safety factor of the overall instability of the trench.The parameter sensitivity of the two calculation methods was compared and analyzed from the point of view of safety factor.Finally,the two mud weight calculation methods were compared and verified with an engineering example.The results show that:compared with the co mmon methods,this method fully considers the cohesion on the vertical side of the sliding body,and the value of safety factor is relatively large,which is more suitable for the stability analysis of clay trench,and safety factor is mainly affected by the length of the trench,the friction angle of soil,mud weight and the relative height difference between the mud and water level.The actual slotted mud weight is within the control range of theoretical calculation,and the theoretical analysis is verified by field ultrasonic testing,and the results can provide theoretical reference for the trenching construction of diaphragm wall in the future.
作者
路乾
胡长明
王晓华
贾文彪
杜逸璞
Lu Qian;Hu Changming;Wang Xiaohua;Jia Wenbiao;Du Yipu(School of Civil Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,P.R.China;Shaanxi Key Laboratory of Geotechnical and Underground Space Engineering,XAUAT,Xi'an 710055,P.R.China;China Railway first Group Construction&Installation Engineering Co.,Ltd.,Xi'an 710055,P.R.China)
出处
《地下空间与工程学报》
CSCD
北大核心
2021年第3期864-871,共8页
Chinese Journal of Underground Space and Engineering
基金
国家自然科学基金(51408463)
陕西省教育厅专项科研计划(17JK0424)。
关键词
地下连续墙
槽壁整体失稳
极限平衡
泥浆重度
安全系数
diaphragm wall
overall failure of the trench
limit equilibrium method
mud weight
safety factor
