水厂铁矿河西渣土场雨季滑移变形规律研究

Study on Slip Deformation Laws of Hexi Slag Soil Field in Shuichang Iron Mine During Rainy Season

渣土场属于松散堆积体,遇水后易诱发坍塌和泥石流,研究不同降雨强度对渣土场边坡稳定性的影响具有现实意义。以首钢水厂铁矿河西渣土场B-B剖面为研究对象,通过数值模拟对渣土场滑移变形规律进行研究,模拟分析自然、小雨、中雨、大雨、暴雨、大暴雨和特大暴雨7种不同工况下的边坡稳定性。系统分析边坡内部土体水平应力、垂直应力;根据有关规范,采用3种评价方法确定不同工况下边坡的安全系数。评价结果表明,渣土场边坡整体处于稳定状态,但边坡局部在暴雨、大暴雨和特大暴雨3种工况下处于失稳状态,在其余4种工况下处于临界状态,说明边坡局部易诱发坍塌破坏,应当对+175 m平台和+220 m平台边坡进行加固。

The slag soil field is a loose accumulation body,which is easy to induce collapse and debris flow after encountering water.It is of practical significance to study the impacts of different rainfall intensities on the slope stability of the slag soil field.Taking the B-B section of Hexi slag soil field in the Shuichang Iron mine of Shougang as the research object,the slip deformation laws of the slag soil field was studied through numerical simulation,and the slope stability was simulated and analyzed under seven different working conditions including nature,light rain,moderate rain,heavy rain,rainstorm,heavy rainstorm and extraordinary rainstorm.The horizontal stress and vertical stress of the soil mass inside the slope were systematically analyzed.According to relevant specifications,three evaluation methods were used to determine the safety factor of slope under different working conditions.The evaluation results show that the overall slope of slag soil field is generally stable,but the slope is partially unstable under three working conditions of rainstorm,heavy rainstorm and extraordinary rainstorm,and is in a critical state under the other four working conditions.It is indicated that the local area is prone to collapse and damage,and the slope at+175 m platform and+220 m platform should be reinforced.