工作面切眼顶板冒顶危险区预测体系研究  

On danger-area forecast system of working face opening roof caving

作　　者：李季[1] 樊龙[1] 赵希栋 王飞[1] 杨光荣[1] 

机构地区：[1]中国矿业大学(北京)资源与安全工程学院,北京100083

出　　处：《采矿与安全工程学报》2014年第3期390-398,共9页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(51234005;51204187)

摘　　要：为了解决单指标巷道顶板冒顶危险区预测方法在进行切眼顶板冒顶危险区预测时预测精度不足和预测结果不准确的问题,利用RFPA数值模拟和层次分析法,研究了切眼顶板冒顶机理和冒顶影响因素。结果揭示了切眼冒顶机理:岩层强度和刚度大小的不同会对岩层间的离层大小产生重要影响,离层量的大小决定了冒顶的程度。同时发现切眼顶板冒顶的2个主要因素为锚杆(索)支护质量和顶板岩层结构。以这2个影响因素为预测指标,建立了切眼顶板冒顶危险区预测体系。利用预测体系对12018工作面切眼顶板冒顶危险区进行了预测,预测结果显示超过50%面积的切眼顶板存在冒顶危险,危险区主要分布在切眼的上下端头位置和切眼中部位置,据此对危险区域进行了补强支护设计。补强支护后的顶板平均离层量仅为12 mm,顶板下沉速率为0.2mm/d,保证了切眼的安全。In order to improve the precision and accuracy in forecasting the risk level of opening roof only applying single index, affecting factors and mechanism of roof caving in opening area are studied with methods of RFPA numerical simulation and analysis hierarchy process. The mechanism shows that the difference in rock strength and stiffness leads to a dramatic variation in the separation size between roof strata, which has a direct impact on the degree of roof carving. Also, it points out that the anchor bolt （cable） supporting quality and the structure of roof strata are two main factors affecting roof caving in opening area. Taking these two factors as forecast indexes, the danger-area forecast system of open-ing roof was built up, and forecast of the danger-area is made in opening area of 12018 working face basing on this system. The forecast result illustrates that roof caving danger exists in more than 50%ar-ea of the roof in opening area, and the danger-areas distribute in the upper and lower end position and in the central position. According to this forecast result, reinforcing supported the danger-area to ensure the safety and reliability of mining operation, with a separate minor average size of 12 mm and a gradual falling rate of 0.2 mm/d.

关 键 词：切眼 冒顶机理 冒顶影响因素 冒顶危险区预测 

分 类 号：TD353[矿业工程—矿井建设]