【作者】 吴海真； 顾冲时； 张文捷； 傅琼华；

【Author】 Wu Haizhen, GuChongshi, Zhang Wenjie, Fu Qionghua (College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing, 210098, China; Jiangxi Water Conservancy Scientific Research Institute, Nanchang 330029, China)

【机构】 河海大学水利水电工程学院； 江西省水利科学研究院；

【摘要】 在对降雨入渗及其引发边坡失稳机制的研究基础上,对影响边坡降雨入渗过程的条件进行了分析研究, 建立了降雨入渗条件下的三维非稳定饱和-非饱和渗流数学模型和有限元求解格式。运用延伸的摩尔库仑强度理论,对某堆积体高边坡进行了降雨过程的饱和-非饱和渗流场计算和稳定分析。表明采用实际可能降雨特征时,边坡的最小安全系数发生在雨后一定时间内,与多数自然边坡在雨后一段时间产生滑动失稳的实际情况相吻合。研究指出了在模拟因降雨入渗引发边坡失稳过程时,应优先采用实际可能降雨强度和雨型,拓展了降雨入渗时边坡稳定分析的范畴,可更合理地解释因降雨引发的边坡失稳问题。更多还原

【Abstract】 The percolation process and some influencing factors of rainfall infiltration are studied based on mechanism of rock sliding due to rainfall infiltration. A 3D unsteady saturated and unsaturated seepage mathematical model and its FEM resolution under the condition of rainfall infiltration are established. The saturated and unsaturated seepage field of a stack slope and its stability are calculated based on extended Mohr-Coulomb strength law. Calculated results show that the minimum safety factor of the slope appears within certain duration of time after rainfall cessation, and that this phenomenon is in accordance with the reality. Research indicates that possible rainfall characteristics should take precedence when the slope instability induced by rainfall process is simulated. This study extends slope stability analysis category and could give a reasonable explanation about slope instability due to rainfall infiltration.更多还原