试验分析掺砂量对水泥砂浆桩Duncan-Chang模型参数影响  

Experimental analysis of the influence of sand content on the Duncan-Changmodel parameters of cement mortar pile

作　　者：李昉 LI Fang(China Railway Siyuan Survey and Design Group Co.Ltd,Wuhan 430063,China)

机构地区：[1]中铁第四勘察设计院集团有限公司,湖北武汉430063

出　　处：《铁道科学与工程学报》2018年第3期645-650,共6页Journal of Railway Science and Engineering

摘　　要：通过三轴固结排水试验,研究掺砂量对水泥砂浆桩邓肯-张模型参数的影响。研究结果表明:水泥砂浆桩应力应变曲线呈双曲线型,计算获得邓肯-张模型8大参数初始弹性模量和初始泊松比。淤泥质土中水泥掺入比为17.1%时,掺砂量从30%增加到50%,水泥砂浆桩内摩擦角从34.6°增加到36.1°,而黏聚力则从46.8 k Pa降低到28.8 k Pa,初始弹性模量在10.0~65.0 MPa之间,初始泊松比在0.2~0.35之间。掺入水泥使淤泥质土由塑性破坏转为脆性破坏,随着掺砂量的增大,试样的脆性进一步增强。The influence of sand content on the parameters of Duncan-Chang model of cement mortar pile was studied by triaxial consolidation drainage test.The results showed that the stress strain curve of cement mortar pile was hyperbolic,and the eight parameters of Duncan-Chang model,the initial elastic modulus and the initial poisson ratio are obtained.For mucky soil,as the cement content was 17.1%,when the sand content was increased from 30%to 50%,the internal friction angle of cement mortar pile increased from 34.6°to 36.1°,while the cohesion decreased from 46.8kPa to 28.8 kPa,the initial elastic modulus was between 10.0 MPa and 65.0 MPa,the initial poisson ratio was between 0.2 and 0.35.When cement was mixed in mucky soil,its failure mode converted from plastic failure to brittle failure.When sand content increased,it became brittler.

关 键 词：水泥砂浆桩 邓肯-张模型 初始弹性模量 初始泊松比 黏聚力 内摩擦角 掺砂量 

分 类 号：TU447[建筑科学—岩土工程]