植被须根护坡力学效应的三轴试验研究  

TRIAXIAL EXPERIMENTAL STUDY OF MECHANICAL EFFECT OF SLOPE PROTECTION WITH VEGETATION FIBRIL

作　　者：张锋[1,2] 凌贤长[1,2] 吴李泉[3] 王立娜[1,2] 朱占元[1,2,4] 吴昊[1,2] 

机构地区：[1]哈尔滨工业大学路基与防护工程研究所,黑龙江哈尔滨150090 [2]哈尔滨工业大学土木工程学院,黑龙江哈尔滨150090 [3]浙江科技学院建筑工程学院,浙江杭州310023 [4]四川农业大学城乡建设学院,四川都江堰611830

出　　处：《岩石力学与工程学报》2010年第A02期3979-3985,共7页Chinese Journal of Rock Mechanics and Engineering

基　　金：浙江省科技支撑与引导计划项目(2008C23019);四川省教育厅资助科研项目(08ZA065)

摘　　要：依托浙江省武义县平头村山体高边坡,基于常规三轴固结不排水试验,探究植被须根含量和含水量对重塑非饱和粉质黏土抗剪强度指标的影响规律。试验结果表明:(1)土样的主应力差–轴向应变关系曲线中,主应力差随轴向应变的增加而增大,试验曲线基本表现为硬化型,且随着围压的增加,土体强度增加。(2)含水量对土的抗剪强度指标影响很大,黏聚力与含水量的变化关系呈抛物线型,存在一个界限含水量19%,高于或低于此含水量时,土样黏聚力较小;随含水量的增加,内摩擦角减小,二者近线性递减。(3)植被须根可以提高土体抗剪强度,但与土的含水量和须根含量大小有关,含水量为19%时,植被须根可以显著提高素土的黏聚力,且须根体积含量5%时土体黏聚力较大,但对内摩擦角影响较小。以上研究结果为浙江武义平头村山体高边坡的失稳预警与滑坡防治提供量化资料,同时也为其他植被护坡工程设计准备必要的参考。To investigate the shear strength parameters of silty clay influenced by the water content and vegetation fibril content,the conventional triaxial consolidated undrained（CU） experiments on the soil sampled from Pingtou Village slope at Wuyi County in Zhejiang Province were carried out through. The experimental results show as follows：（1） With the increase in axial strain,the deviatoric stress increases,and the relation curves of deviatoric stress and axial strain present as hardening type. With the increase in confining pressure,the shear strength increases. （2） The water content of soil has great impacts on shear strength of the silty clay. The relationships between cohesion and water content present as parabola type. The cohesion would approach the maximum value when the water content is 19%;whereas with the increase in water content,the internal friction angle decreases linearly. （3） The vegetation fibril could improve the shear strength of silty clay,but it is related to the values of water content and vegetation fibril content. When the water content is 19%,the cohesion is improved greatly;and when the vegetation fibril is 5%,the cohesion approaches the maximum value. The internal friction angle is less influenced by the vegetation fibril. All results are meaningful to providing the quantitative information for prevention and treatment of Pingtou Village slope,as well as providing the necessary engineering design reference for protection of other slopes with vegetation fibril.

关 键 词：边坡工程 植被须根护坡 力学效应 抗剪强度 含水量 三轴压缩试验 

分 类 号：P642.22[天文地球—工程地质学]