崩岗侵蚀区非饱和花岗岩残积土强度特性试验研究  

Experimental Study of Strength Characteristics of Unsaturated Granite Residual Soil in Collapsing Erosion Area

作　　者：罗小艳 扶名福[2] LUO Xiaoyan;FU Mingfu(School of Civil Engineering and Architecture,Jiangxi Science and Technology Normal University,Nanchang 330013, Jiangxi,China;School of Civil Engineering and Architecture,Nanchang University,Nanchang 330031,Jiangxi,China)

机构地区：[1]江西科技师范大学建筑工程学院,江西南昌330013 [2]南昌大学建筑工程学院,江西南昌330031

出　　处：《水力发电》2019年第1期107-111,共5页Water Power

基　　金：国家自然科学基金资助项目(51468041);江西省教育厅科学技术研究项目(GJJ170666);江西科技师范大学博士科研启动基金项目(2017BSQD010)

摘　　要：以崩岗侵蚀区花岗岩残积土为研究对象,应用非饱和土三轴仪对重塑花岗岩残积土进行强度特性试验,研究干密度、净围压和基质吸力对应力-应变关系和强度的影响规律,并分析重塑非饱和花岗岩残积土在控制吸力条件下的抗剪强度特性。结果表明,非饱和花岗岩残积土的应力-应变关系均呈硬化型;在干密度相同时,非饱和土强度随着基质吸力和净围压的增大而增大;在净围压相同条件下,非饱和土强度随着基质吸力和干密度的增大而增大;基质吸力对粘聚力影响较大,基本上呈线性增长关系,而有效内摩擦角受基质吸力的影响较小,几乎可以不计;非饱和重塑花岗岩残积土的强度随着基质吸力和干密度增大而增大,与基质吸力相关的摩擦角较大。The strength characteristics of unsaturated granite residual soil in collapsing erosion area are investigated by a series of triaxial tests with suction-controlled conditions. The influences of different initial dry density,net confining pressure and suction on stress-strain relationship and strength of unsaturated residual soils are studied and the shear strength characteristics of remolded unsaturated granite residual soil under suction-controlled conditions are analyzed. The results show that,( a) the stress-strain relationship of unsaturated granite residual soil exhibits a characteristics of strain-hardening;( b) under the condition of same dry density,the peak strength increases with the increase of suction and net confining pressure;( c) under same net confining pressure,the peak strength increases with the increase of suction and dry density;( d) the cohesion increases greatly with the increasing of suction with a linear growth to suction,but the suction has smaller effect on friction angle which can be nearly ignored;and( e) the increases of suction and dry densities have a positive effect on the strength of residual soil,and the triaxial shear coefficient is larger.

关 键 词：崩岗侵蚀区 非饱和土 花岗岩残积土 基质吸力 三轴试验 

分 类 号：TU411[建筑科学—岩土工程]