不同环境下滨海公路侵蚀性粉质土力学性质试验研究  

Test and Research on Mechanical Properties of Silty Soil of Coastal Road under Different Environment

作　　者：于德海[1,2] 张涛[1,2] 

机构地区：[1]大连海事大学道路与桥梁工程研究所,大连市116026 [2]大连海事大学辽宁省公路工程重点实验室,大连市116026

出　　处：《公路》2015年第8期206-209,共4页Highway

基　　金：国家自然科学基金资助项目;项目编号40902075;中央高校基本科研业务费资助;项目编号3132014326;3132014074

摘　　要：为了解不同环境下滨海公路侵蚀性粉质土的力学特性,利用SLB-1型三轴剪切渗透试验仪,分别对干燥状态、淡水饱和、海水饱和的粉质土进行三轴剪切试验。基于试验过程,比较试样在不同物理环境及不同围压作用下的力学性质,详细分析水对试样力学特性的影响作用,重点研究峰值强度、黏聚力、内摩擦角、有效应力、孔隙水压力等力学指标的变化规律,探讨三向应力状态下侵蚀性粉质土的力学机制。结果表明,水对侵蚀性粉质土力学性质的弱化是显著的,干燥试样的围压效应要比饱水试样的明显,峰值强度、有效应力随围压呈线性升高趋势,孔隙水压力以指数规律呈非线性变化,尤其是海水饱和试样由于围压效应较弱,最易破坏。In order to understand the mechanical properties of silty soil of coastal road under different environment,tri-axial shear test is carried out to investigate dry and saturated specimens by mechanics test equipment SLB-1.Based on the experimental process,mechanical properties of specimen are compared under different physical environment or confining pressure,and the effect of water on mechanical characteristics of silty soil is analyzed in detail.The variation law on mechanical parameters,including peak strength,cohesive force,internal friction angle,effective stress and pore water pressure,are mainly studied.In addition,mechanical mechanism of silty soil under three-dimensional stress condition is discussed.The results show that the weakening effect of water on mechanical properties of silty soil is obvious,and confining pressure effect of dry sample is more notable than saturated sample.Peak strength and effective stress are linear increase relation with confining pressure,and pore water pressure has the nonlinear law of negative exponent.As the effect of confining pressure is smaller to sea-saturated sample,it is more easily destructed.

关 键 词：道路工程 粉质土 围压 饱水 力学性质 

分 类 号：U414.01[交通运输工程—道路与铁道工程]