软基加筋设计中的不当与改进  

Discussion on impropriety and improvement in design of geosynthetic-reinforced soft foundation

作　　者：彭良泉 PENG Liangquan(Changjiang Survey,Planning,Design and Research Co.,Ltd.,Wuhan 430010,China)

机构地区：[1]长江勘测规划设计研究有限责任公司,湖北武汉430010

出　　处：《人民长江》2022年第2期124-131,共8页Yangtze River

摘　　要：针对目前软基加筋设计在极限承载力、有限厚度软基抗侧向挤出计算以及深厚软基稳定分析中存在的问题,采用塑性极限分析方法对加筋软基极限承载力进行了探讨。利用极限平衡理论对有限厚度加筋软基抗侧向挤出安全系数进行了研究。提出利用“拟黏聚力”模型分析深厚软基加筋堤坝稳定计算。研究成果表明:对于软基加筋设计,考虑到筋材的作用,建议将加筋地基极限承载力提高7.4%;当地基软土层具有有限深度时,采用提出的坡趾处侧向挤出分析安全系数计算公式更加准确;利用“拟黏聚力”模型分析加筋堤坝稳定,既充分考虑了筋材对稳定的有利影响,又避免了常规分析方法的缺陷,值得推广。In view of the existing problems in reinforcing design of soft foundations,such as ultimate bearing capacity,calculation of lateral extrusion of soft foundation of finite thickness and stability analysis of deep soft foundation,we study the ultimate bearing capacity of geosynthetic-reinforced soft foundation by plastic limit analysis method,and the safety factor of lateral extrusion of reinforced soft foundation of finite thickness by using limit equilibrium theory.It is proposed to use the quasi cohesive force model to calculate stability of geosynthetic-reinforced embankment on deep soft foundation.The results show that for the geosynthetic reinforcing design of soft foundation,due to the role of geosynthetics,it is recommended to increase the ultimate bearing capacity of reinforced foundations by 7.4%;when the soft soil has finite depth,a formula for calculating the safety factor of the lateral extrusion at the slope toe is proposed.The model of quasi cohesive force not only considers favorable influence of geosynthetics on stability,but also avoids defects of conventional analysis methods.

关 键 词：土工合成材料 软弱地基 地基极限承载力 侧向挤出分析 堤坝稳定 

分 类 号：TU447[建筑科学—岩土工程]