摘要
以陵川县某采动堆积层滑坡为例,通过理论计算推导出了考虑水力坡脚因素时的降雨入渗孔隙水压力差公式,并结合渗流-应力耦合模型进行分析论证。结果表明:渗流-应力耦合条件下,地下开采是该采动堆积层滑坡应力场调整的主导因素,渗流及降雨仅影响应力场调整范围,不影响趋势,这种影响具有"附加性";降雨通过形成随着降雨历时变化的暂态饱和区,影响堆积层有效应力分布,这一过程在雨后还会持续导致堆积层有效应力增加,且在考虑水力坡脚的条件下,增加程度更大;推断出了采动堆积层滑坡失稳的3个特征阶段:结构改造、塑流-拉裂、蠕滑-拉裂阶段。
A mining accumulation landslide in Lingchuan county is taken as an example, the theoretical calculation is used to deduce the water pressure difference formula of rainfall infiltration pore by considering the hydraulic slope foot factor, and the seepage-stress coupling models are used for analysis and demonstration. The results show that the underground mining is the dominant factors of the stress field adjustment of mining accumulation landslide under the condition of seepage-stress coupling, the seepage and rainfall only affects stress field adjustment range, does not affect the trend, and this kind of influence has the feature of"additivity". Rainfall affects the distribution of effective stress in the accumulation layer by forming a transient saturated zone that varies with rainfall duration, and this process will continue to lead to the increase of effective stress in the accumulation layer after rain. Three characteristic stages of landslide instability in mining accumulation are deduced, including structural transformation,plastic fluid-tension fracture, creep-tension fracture.
作者
樊辉
吕义清
郑劭铎
FAN Hui;LYU Yiqing;ZHENG Shaoduo(Department of Earth Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China;China Institute of Geotechnical Investigation and Surveying,Beijing 100007,China)
出处
《煤矿安全》
CAS
北大核心
2020年第11期281-285,289,共6页
Safety in Coal Mines
基金
山西省自然科学基金资助项目(201701D121015)。
关键词
堆积层滑坡
采空区
渗流-应力耦合
降雨入渗
变形分析
accumulation landslide
goaf
seepage-stress coupling
rainfall infiltration
deformation analysis
