地基强度随固结度增长的原理在垃圾填埋场地基承载力评估中的应用  

Application of the principle of ground strength increasing with degree of consolidation in the evaluation of bearing capacity of solid waste sanitary landfill

作　　者：薛祥[1] 李军[1] 侯东利[1] 李根义 

机构地区：[1]北京市勘察设计研究院有限公司,北京100038 [2]北京市市政工程设计研究总院有限公司,北京100082

出　　处：《工程勘察》2017年第10期24-28,45,共6页Geotechnical Investigation & Surveying

摘　　要：按常规建筑结构地基承载力评价的方法给出的垃圾填埋场的地基承载力特征值一般远小于垃圾填埋场的基底压力,而目前国内外规范对柔性基础(如垃圾填埋场、高填方路基)下地基承载力没有相应的理论依据和确定方法,因此急需研究在所建大型垃圾填埋场不进行地基处理的情况下如何评价场区地基承载力的方法。本文利用建筑结构按等效抗剪强度原理确定地基承载力的方法,基于地基土在垃圾体填埋过程中其承载力随地基固结度的提高而增大的基本原理,对大型垃圾填埋场地基的地基承载力的提高进行了研究,以在勘察阶段更好地评价大型垃圾填埋场的地基承载力。研究结果表明:在考虑地基承载力随固结度提高的情况下,各垃圾场填埋阶段的地基承载力特征值均满足要求,反之,若不考虑地基承载力随固结度的提高,垃圾填埋场在部分填埋阶段的地基承载力特征值不满足要求。实践证明,采用本文方法对垃圾填埋场的地基承载力进行评估是一种实用、有效和可靠的评估方法,可供同行参考和借鉴。The characteristic values of subsoil bearing capacity can be far less than that of the landfill base pressure according to the conventional building structure foundation bearing capacity evaluation method for the landfill foundation,and for the domestic and international norms of the flexible foundation（ such as a landfill,high fill subgrade） there is no corresponding theoretical basis and method for determining bearing capacity at present. Therefore,it is an urgent research and resolution topic to study how to evaluate the field area foundation bearing capacity in the construction of landfill without ground treatment. The increase of the bearing capacity for large-scale landfill is studied,which based on the principle of soil strength growth with consolidation degree and the method of equivalent shear strength for building structure foundation bearing capacity determination. The results show that,in considering the bearing capacity increase of the foundation with the consolidation degree,the landfill foundation characteristic values of the subsoil bearing capacity in all stages could meet the requirements. Conversely,the values in each stage couldn＇t meet the requirements of the relevant codes or designer. The practice shows that the method for the bearing capacity evaluation of landfill foundation is a practical,effective and reliable assessment method,which could be used for the reference in practice.

关 键 词：垃圾填埋场 固结度 等效抗剪强度 地基承载力 评价 

分 类 号：TU441[建筑科学—岩土工程]