特大断面立井初支优化研究  

Optimization Research on Primary Support of Shaft with Large Section

作　　者：张赞[1] 苏学贵[1] 王堂[1] 杨宗一 张锁[1] 

机构地区：[1]太原理工大学矿业工程学院,山西太原030024

出　　处：《煤矿安全》2017年第11期53-56,共4页Safety in Coal Mines

基　　金：国家自然科学基金资助项目(51274145);山西省自然科学基金资助项目(2015011066)

摘　　要：结合典型工程实例,针对井筒初支出现裂缝、混凝土喷层剥落的现象,研究初支体系的变形机理和破坏特征,并提出了2种初支优化方案,运用数值模拟的方法,对优化方案的支护效果进行比较。结果表明:锚杆是井筒初支的主体,但是遇到围岩强度较低、岩体较为破碎的情况,锚杆的支护作用被削弱,需要强化钢拱架来控制井壁围岩的稳定;增加锚杆的长度和密度,减小了16%的井壁位移量;而增强钢拱架型号和增加钢拱架密度可以使井壁位移量减小47%、塑性屈服范围减小了50%以上。In this paper, combined with the typical engineering examples, aiming at the phenomenon of shotcrete spalling of concrete and cracks, we study deformation mechanism and failure characteristics of the primary support system, and propose two kinds of primary support optimization schemes. Using numerical simulation, we compare the supporting effect of optimization schemes. The results show that the anchor is the main initial support of shaft, but, in the case of low strength and relatively broken rock mass, the supporting role of the bolt is weakened, the steel arch is needed to control the stability of the wall surrounding rock. The displacement of the well wall is reduced by 16% through the increase of the length and density of the bolt.Enhance steel arch type and increase the density of steel arch can reduce the displacement of shaft wall by 47%, the plastic yield range is reduced by more than 50%.

关 键 词：特大断面立井 不良岩体地质 初期支护 井筒稳定性控制 变形机理 破坏特征 

分 类 号：TD352[矿业工程—矿井建设]