摘要
通过重塑素土与草根加筋土的三轴渗透剪切试验,分析草根对土体渗透性和强度的影响。结果表明:渗透对素土和草根加筋土的强度均具有弱化效应,弱化幅度随水力比降的增大而提高,但围压的增大可以缓解该弱化作用;重塑素土和草根加筋土的内摩擦角随水力比降的增大变化规律不明显,而粘聚力随水力比降的增大呈明显的降低趋势;通过渗透工况下重塑素土和草根加筋土粘聚力及破坏强度的对比,得出根系的存在可以有效提高土体抵抗渗透破坏的能力;考虑渗透对草根加筋土强度破坏的临界深度随水力比降的变化关系为幂函数形式。
The seepage caused by water level change is one of the important factors that cause slope instability.In order to prevent instability,based on the principle of environmental protection,vegetation planting is applied to slope protection engineering.Through triaxial seepage shear tests of remolded soil and remolded grassroots-reinforced soil（RS and RGRS）,the influence of grassroots on permeability and strength were analyzed.The laboratory test results show that：（1）The seepage can weaken the strength of RS and RGRS.The weakening extent increases with increasing hydraulic gradient.However,with the increase of confining pressure,the weakening extent reduces.（2）The internal friction angles of RS and RGRS don＇t change obviously with increasing hydraulic gradient,while the cohesions reduce.（3）By comparing the cohesion as well as failure strength of RS and those of RGRS,it can be concluded that the roots can improve the ability of soil resisting seepage damage.（4）The power function is presented to characterize the depth of considering the seepage damage to the strength of grassroots reinforced soil with hydraulic gradient change.
出处
《防灾减灾工程学报》
CSCD
北大核心
2017年第1期140-147,共8页
Journal of Disaster Prevention and Mitigation Engineering
基金
国家自然科学基金项目(51279128)
国家自然科学基金创新研究群体科学基金项目(51321065)
交通运输部交通建设科技项目(2013328224070)资助
关键词
草根
加筋土
渗透
强度
grassroots
reinforced soil
seepage
strength
