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中国地域辽阔,湿陷性黄土分布广泛,大厚度湿陷性黄土地基不仅关系到建筑物的安全、施工难易和工程造价,甚至还决定工程建设的可行性,其意义重大。然而,大厚度湿陷性黄土地基的处理经验仍然严重不足,规范也未对其作出相应的规定,因而该问题一直困扰着工程设计人员。该文基于湿陷性黄土的工程特性,针对现有湿陷性黄土地基处理方法所存在的缺陷,创新性地提出了灰土垫层与防渗膜相结合的联合地基处理方法,并对该复合地基进行深入探讨,不仅对复合地基力的相互作用、变形及效应做了研究,而且分析了防渗膜铺设深度对复合地基应力应变的影响。
China has a vast territory with a wide distribution of collapsible loess. The large thickness of collapsible loess foundation not only concerns the safety of buildings, construction difficulty and project cost, but also determines the feasibility of engineering construction. However, the treatment experience of large-thickness collapsible loess foundation is still seriously inadequate, and norms have not made corresponding provisions. Therefore, this problem has plagued the engineering designers. Based on the engineering characteristics of collapsible loess, aiming at the defects existing in the existing collapsible loess foundation treatment method, a new combined ground treatment method combining lime soil cushion and impermeable membrane was put forward. The foundation is studied in depth. Not only the interaction, deformation and effect of the composite foundation are studied, but also the influence of depth of impervious membrane on the stress and strain of the composite foundation is analyzed.