对水平增强体复合地基设计中几个问题的探讨  

Discussion on the issues in the design of horizontal reinforced composite oundation

作　　者：彭良泉 PENG Liangquan(Changjiang Surveying,Planning,Design and Research Co.,Ltd.,Wuhan 430010,Hubei,China;National Dam Safety Engineering Technology Research Center,Wuhan 430010,Hubei,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 [2]国家大坝安全工程技术研究中心,湖北武汉430010

出　　处：《地基处理》2024年第5期469-474,487,共7页Journal of Ground Improvement

基　　金：国家大坝中心自主创新项目(CX2022Z01-1)。

摘　　要：针对目前水平增强体复合地基在承载力、沉降以及稳定计算中存在的问题进行了研究。算例结果表明:考虑筋材水平拉力和垂直拉力的作用,对于底层加筋软土,其地基极限承载力提高幅度约为10.32%,对于铺设3层土工织物的软土,其地基极限承载力提高幅度约为84%;考虑筋材受拉产生的垂直向上的拉力对减小基底附加应力的有利作用,同时考虑筋材受拉产生的水平拉力均化地基表面附加应力,从而减小不均匀沉降的有利影响,双层土工织物加筋地基沉降较无筋地基减小幅度为59.6%。本文提出的拟黏聚力分析模型舍弃了加筋路堤仅考虑筋材抗滑力矩的常规稳定分析方法,将筋材加固作用转化为加筋土体抗剪强度的提高,能够充分反映加筋路堤的实际工作状态,算例表明,边坡稳定安全系数比不考虑拟黏聚力时提高53.36%。This paper investigates the issues in the calculation of bearing capacity,settlement and stability of horizontal reinforced composite foundation.The results show that considering the effects of horizontal and vertical tension of reinforcement,the ultimate bearing capacity of the foundation increases by 10.32%for the soft soil foundation with bottom reinforcement,and 84%for the foundation with three layers of geotextile.Considering the beneficial effect of the vertical tension generated by the reinforcement on reducing the additional stress of the foundation,and the beneficial effect of the horizontal tension generated by the reinforcement on reducing the additional stress on the surface of the foundation to reduce the uneven settlement,the settlement of the double-layer geotextile reinforced foundation decreases by 59.6%compared with that of the non-reinforced foundation.The proposed pseudo-cohesive force analysis model abandons the conventional method which only unilaterally consider the anti-sliding moment of the reinforcement material,but converts the reinforcement effect into the improvement of the shear strength of the reinforced soil body,which can fully reflect the actual working state of the reinforced embankment.Case studies indicate that the safety factor is 53.36%higher than that without considering pseudo-cohesive force.

关 键 词：水平增强体复合地基 拟黏聚力 极限承载力 沉降 加筋路堤稳定性 

分 类 号：TU470[建筑科学—结构工程]