基于Terzaghi极限承载力理论的PLT边载效应分析  

Analysis of side load effect on PLT based on Terzaghi ultimate bearing capacity theory

作　　者：刘天云[1] 朱幸科 林佑高[2] LIU Tian-yun;ZHU Xing-ke;LIN You-gao(CCCC Fourth Harbor Engineering Co.,Ltd.,Guangzhou 510290,China;CCCC-FHDI Engineering Co.,Ltd.,Guangzhou 510230,China)

机构地区：[1]中交第四航务工程局有限公司,广东广州510290 [2]中交第四航务工程勘察设计院有限公司,广东广州510230

出　　处：《水运工程》2018年第7期143-147,171,共6页Port & Waterway Engineering

摘　　要：浅层平板载荷试验(PLT)广泛应用于土木工程中浅部地基土层承载力的评定,试验过程中承压板周围覆土边载有可能对地基承载力评定造成影响。基于极限平衡理论,推导出广义边载分布条件下Terzaghi极限承载力公式,通过调整浅层平板载荷试验(PLT)承压板周围边载的范围和大小,分别针对砂土和黏性土地基,分析边载效应对地基极限承载力的影响大小和变化规律。结合工程实例,指出在工程应用中最终边载效应对处理后地基土的影响程度须结合PLT试验过程中土体最终达到的应力状态做出综合判断。Shallow plate loading test（ PLT） is widely applied in civil engineering for evaluation of subsoil bearing capacity.Side load due to soil around loading plate may influence the judgment of subsoil bearing capacity.Based on limit equilibrium theory,we derive Terzaghi ultimate bearing capacity formula under a more generalized side load distribution condition.By adjusting magnitude and distribution of side load around loading plate in PLT,we analyze side load effect on ultimate subsoil bearing capacity respectively for sand and cohesive soil foundation.Combined with an engineering case,we point out that side load effect on determination of wether allowed subsoil bearing capacity should be judged on fully consideration of soil stress state reached in the process of PLT.

关 键 词：TERZAGHI 极限平衡 边载 极限承载力 PLT 

分 类 号：U655.54[交通运输工程—港口、海岸及近海工程]