研山铁矿边坡稳定性影响因素分析及控制技术

Affecting Factor Analysis and Control Technique of Open-pit Slope Stability in Sijiaying Iron Mine

露天边坡的稳定是决定矿山安全生产的关键因素。基于研山铁矿边坡工程地质特征现场调查结果,得出边坡岩性、水以及开采扰动是影响矿区边坡稳定性的三大主要因素。综合考虑边坡岩土体破碎情况将边坡自西向东划分为3个分区,根据各区边坡实际状况,分别采用了全长黏结锚杆支护、预应力锚索、挂网喷射混凝土等防护治理措施。基于预裂爆破技术原理,对研山铁矿进行了预裂爆破参数设计及现场试验,结果表明,设计的爆破参数不仅大幅度降低了爆破震动,减小了对台阶损伤破坏,极大地增强了边坡的稳定性,为矿山安全生产奠定了基础。

The stability of open pit slope is the key factor affecting the mine production security. Based on the results of field investigation,it shows that slope lithology,water,and mining disturbance are the main three factors affecting the stability of Mine. The slope is divided to three areas by comprehensively considering the slope stability of rock and earth mass and the re-inforcement measures of whole-length bonding bolt,anchor wire technology,steel mesh＋spray anchor net are taken to strengthen the slope stability. Based on the actual situation of the slope,some treatment measures are taken,such as full-length grouted bolt,pre-stressed cable,hanging shotcrete. Based on the pre-blasting technology theory,the pre-blasting parameter of the Yans-han Iron Mine was designed and brought into the field operations. The results show that the parameters greatly reduced blasting vibration and damage to the slope step,and then significantly improve the slope stability. The research lays a good foundation for the safety production of the mine.