摘要
为探明溜砂坡在不同含水率状态下的运动状态以及数值模拟方法的适用性问题,通过对典型溜砂坡的土样进行工程特性测试,发现溜砂坡的内摩擦角和黏聚力分别在含水率为3%和13%时达到峰值,结合野外调查,将两个含水率作为溜砂坡散粒体状、团状以及流体状的划分界限,当含水率为0和3%时用PFC软件模拟,含水率为7%和11%时用FLAC软件模拟,含水率为15%和19%时采用GeoStudio软件模拟。研究表明:在含水率逐渐增大的情况下,溜砂坡的运动状态是颗粒滚动-局部滑动-表面流动的过程。当溜砂坡颗粒呈散粒体状态时,用PFC进行模拟效果较好;颗粒呈团状时,用FLAC进行模拟效果较好;溜砂坡表面呈流动状态时,用GeoStudio模拟效果较好。研究结论可为该类碎屑斜坡的治理研究提供参考。
In order to study the sand-sliding slope movement status and the applicability of the numerical simulation method under the different water content conditions,the engineering characteristic test of the typical sandsliding slope was carried out.Based on the test,it is found that the internal friction angle and cohesion of the slope reach the maximum when the water content is 3%and 13%,respectively.Combined with field investigation,these two water contents are then used as the dividing line between loose granule,cluster and fluid.And different software were used to conduct numerical simulation of the sand-sliding slope for different water content,i.e.using PFC,FLAC,and GeoStudio software for water content of 0,3%;7%,11%;and 15%,19%,respectively.Our results show that the movement state of the sand-slope varies from particle rolling to local sliding and to surface flow when the water content increases gradually.Moreover,it is also found that when the sand-sliding slop particles are in the granular state,the simulation of PFC performs better,when the Sand-sliding slop particles are in the cluster state,the simulation of FLAC performs better,and when the sand-sliding slop particles are in the flow state,the simulation of GeoStudio performs better.Our results can provides a reference for the numerical simulation of such slope disasters.
作者
叶唐进
李豪
路昊天
舒涛
YE Tangjin;LI Hao;LU Haotian;SHU Tao(School of Engineering,Tibet University Lhasa 850000,China;Faculty of Infrastructure Engineering,School of Hydraulic Engineering,Dalian University of Technology,Dalian 116024,China)
出处
《高原科学研究》
CSCD
2020年第3期96-104,共9页
Plateau Science Research
基金
国家自然科学基金项目(41662020,51769033)
大学生创新实验项目(201710694013,201810694014).
