摘要
当露天采矿边坡存在软弱夹层时,其在降雨作用下的变形破坏机制尤其复杂。文章在现场地质调查基础上分析了滑塌机理,并通过数值模拟手段,明确了本次滑坡为降雨条件下软弱夹层的蠕变滑移所引起的上部岩土体牵引式剪切破坏,作为隔水层的软弱泥岩在降雨入渗以及边坡春季解冻的情况下,含水量持续增大且蠕变作用逐渐加强,对本次滑塌起到控制作用。通过研究在不同降雨条件下边坡的渗流场、位移场及边坡稳定性的演化发展规律,结果表明当降雨量为50 mm/d并持续超过5 d或降雨量为100 mm/d并持续超过3 d时,坡体内部孔隙水压力及位移将快速增长,边坡迅速失稳并发生滑坡。
When there are weak interlayers in the slope of open-pit mining,the deformation and failure mechanism under rainfall is particularly complex.On the basis of on-site geological investigation,the landslide mechanism was analyzed.By using numerical simulation methods,it was determined that the landslide was caused by the creep and sliding of the weak interlayer under rainfall conditions,resulting in the traction shear failure of the upper rock and soil mass.Soft mudstone,as an aquitard,continuously increases its water content and gradually strengthens its creep effect under the conditions of rainfall infiltration and slope thawing in spring,playing a decisive role in this landslide.The evolutionary development laws of the seepage field,displacement field,and slope stability under different rainfall conditions were investigated.The results show that when the precipitation is 50 mm/d and lasts for more than 5 days or 100 mm/d and lasts for more than 3 days,the pore water pressure and displacement inside the slope will rapidly increase,and the slope will quickly become unstable and landslide will occur.
作者
何万通
姜晓谋
申晨鹏
丁阔
HE Wan-tong;JIANG Xiao-mou;SHEN Chen-peng;DING Kuo
出处
《山西水利科技》
2025年第2期56-62,共7页
Shanxi Hydrotechnics
基金
2022年国家自然科学基金青年基金项目“滨海基岩矿床开采隔水结构微裂隙渗流特性及突水机理研究”(No.42202315)。
关键词
关键弱层
降雨
牵引式滑坡
机理分析
critical weak layer
rainfall
traction-type landslide
mechanism analysis
