露天矿坑岩质边坡浸润线及稳定性研究分析

浸润线是露天矿坑岩质边坡的生命线。针对山东三山岛露天矿坑尾矿库高陡岩质边坡非恒定渗流问题,依据同一条浸润线不同渗流截面的渗流量相等以及不同浸润线同一截面的渗流量差值为库水位的增量建立平衡方程,求解浸润线方程的解,运用Seep/W进行模拟,将理论计算结果与模拟值进行对比,验证浸润线方程的正确性;同时将浸润线方程应用到工程实际中,将库水位监测数据进行曲线拟合,与观测孔数据结合分析浸润线位置的变化,运用ABAQUS流固耦合模型对尾矿库边坡的塑性区和安全系数进行分析。研究结果表明:浸润线方程的解与模拟值最大误差为0.01%,满足实际要求;浸润线观测孔数据与理论计算数据基本吻合,误差最大为0.75m,进一步证明理论可靠性;尾矿库水位的上升增加了塑性区范围,安全系数与尾矿库水位变化曲线为"V"字形,库水位为100m时,安全系数最低为1.06,处于极限平衡状态,同时应将库水位设定在-45m以下,为后期库水位设计提供依据。

A study on the infiltration line and stability of rock slopes in open pit mines

The infiltration line is the lifeline of rock slopes in open-pit mines. This work focuses on the non-constant seepage problem of the highly-steep rock slope of the Sanshandao open pit mine in Shandong Province. Considering the seepage of the same section is different from that of the same infiltration line, the equilibrium equation is used to solve the solution of the infiltration line equation. The simulation is carried out by using Seep/W. The theoretical calculation results are compared with the simulated values to verify the correctness of the infiltration line equation. At the same time, the infiltration line equation is applied to the engineering practice, fitting observed water level of the reservoir, and analyzing variation of the infiltration line in combination with data of observational wells. Then using the ABAQUS fluid-solid coupling model, we analyze the plastic zone and safety factor of the tailings slope. The results show that the maximum error of the solution of the infiltration line equation to the simulated value is 0.01%, which satisfies the actual requirement. The data of the observation well of the infiltration line is basically consistent with the theoretical calculation data with the maximum error 0.75m, which proves the theoretical reliability. The rise of the water level of the tailings increases the plastic zone, and the safety factor and the water level change curve of the tailings is of "V" shape. When the water level is 100m, the safety factor is 1.06, which is in the limit equilibrium state. At the same time the water level should set to be below -45m. These data provide a basis for the later establishment of water level of the reservoir.