福建某排土场边坡降雨作用下渗流稳定时变分析

目前对排土场渗流稳定多以单台阶单因素进行分析,较难分析其全面情况。以某矿区排土边坡工程为例,在已获取其工程地质条件的基础上,分析在不同雨型影响下该多台阶排土场渗流特征及稳定性。结果表明:依据当地降雨实际情况,在总雨量相同情况下短时间高强度降雨对排土边坡稳定性影响更大,低台阶的安全系数变化幅值较高台阶更大,排土边坡最小安全系数出现在降雨结束后。合理控制排土边坡坡高和坡度,修建截水沟等排水设施可有效维护排土边坡的稳定性。

Time-dependent Analysis on Seepage Stability of a Refuse-dump Slope under Rainfall in Fujian

At present, the seepage stability of waste dump is analyzed depending on single bench and single factor mostly, thus the comprehensive situation thereof is difficult to study. Taking dump slope in a mining area as an example, the paper, on the basis of the geological conditions acquired, analyzed the seepage characteristics and stability of this multi-bench waste dump under the action of different types of precipitation. The result shows that, according to the actual situation of rainfall in the region, and on condition of the same total amount of precipitation, short-time high-intensity rainfall has larger impact on the stability of dump slope, and the change amplitude of low-bench dump slope’s safety factor is greater than that of high-bench one, the min. safety factor thereof comes into being at the end of rainfall. Proper control of dump slope’s height and gradient and construction of intercepting ditch and other drainage facilities may maintain the stability of dump slope effectively.