本文结合某煤矿倒渣场地，对复合介质边坡进行了地质、水文、煤矸石堆积等全面分析，对场地边坡的破坏机理进行了研究，确定了常见的三种倒渣场破坏模式：沿倒渣场地基软弱层滑坡、倒渣场内部滑坡和沿地基接触面滑坡；分析了倒渣场的稳定机制，在特定的条件下推导了倒渣场的堆高计算公式。采用Sarma法计算了边坡的稳定安全系数，并和先进的数值计算软件FLAC计算出的倒渣场安全系数进行了比较。比较结果表明，该边坡在日常状态下是基本稳定的，但在遭受长时间降雨或较大震动的时候仍会滑动，是不安全的，对1#拦渣坝下方的居民区和厂矿区的安全形成潜在威胁。只有对其进行处理才能保证拦渣坝下方的安全。同时，考虑到美化倒渣场周围的自然环境，本文采取了国际流行的边坡加固方法：植物固坡技术。介绍了植物固坡的优点，分析了植物根系加固边坡的力学机理，建立了植物根系加固边坡的力学模型，根据现场植物根系拉拔试验总结出植物根系在土壤中的分布规律，计算出植物根系对土层抗剪强度的贡献，得出摩擦型根（浅层侧根系）对土层的加筋作用，锚固型根（深层垂直根系）对土层的加锚杆的作用，还根据实际情况得出植物固坡会对边坡产生的影响以及植物固坡的局限性和负面影响，最后根据当地气候环境决定采取刺槐和沙棘混交来加固边坡。

This paper combining one waste-dump, comprehensively analyze the compound medium in geology, hydrology and the coal mine waste deposit. Study the breakage mechanism of the slope and ensure 3 kinds of breakage modes: slide along the weak layer of the groundsill; slide inside the waste-dump; slide along the interface of the groundsill. Analyze the stability mechanism of the waste-dump, deduce the height formula of the waste-dump under certain conditions. Calculate the safety factor of the slope in the way of Sarma, and compare with that of using FLAC. The result is that the slope is stable under daily conditions. But it will be dangerous if the rain is heavy and lasts long or suffer big earthquakes. It will threaten the residential area and part of the coal mine in the foot of 1# dam. We have to deal with the dam in order to protect the residential area and part of the coal mine. In order to beautify the environment around the waste-dump, biotechnique, popular in international in strengthen slope, is adopted. The advantages of biotechnique have been introduced. Analyze the mechanics mechanism of plants root series strengthen the slope, found the mechanics model of plants’ root series strengthen the slope, summarize the distributing rule of plant root series in the soil, work out the plant root series contribution in soil shear strength, draw a conclusion that reinforce effect is considered that the root series act onto the soil; the anchor effect is considered that the main root act onto the soil. The localization and negative infection the plant will produce are educed. Lastly proper plants are chosen to strengthen the slope according to the local surroundings.