金川三矿采场分段巷道支护方式改进研究

发布时间：2018-07-24 13:32

【摘要】：高地应力巷道支护问题是岩石力学领域比较复杂的世界性研究课题之一。长期以来国内外从事采矿、隧道工程及岩石力学理论研究与实践的工作者,在高应力巷道破坏机理和支护技术方面进行了大量研究。但由于高地应力巷道工程地质条件通常比较复杂,因此对该问题的研究有一定的困难。金川矿区由于围岩破碎,构造应力突出,在基建和开采过程中,许多巷道发生严重变形和破坏。矿区现用的普通砂浆锚杆+金属网+喷射混凝土的支护方式虽能在一定程度上控制巷道变形,但支护效果并不理想。许多巷道多次修复,巷道支护成本居高不下。多年来,公司一直在寻求新的支护方式,希望能够在一定程度上解决不良巷道的支护问题。本文以金川三矿1438试验段为研究对象,进行了一系列研究。首先,通过现场调查及相关资料来分析巷道的变形破坏特征;其次分析了高地应力巷道的破坏原因与目前支护中存在的问题;并结合该巷道试验段的实际情况提出相应的改进措施,拟定了改进后的支护方案,并用数值模拟手段对改进后的支护方案与现用的支护方案进行比较;最后,通过现场支护试验的数据监测结果对采用的支护方案进行评价。通过金川1438分段巷道支护试验研究,得出以下结论。巷道直墙脚处容易发生剪切破坏,需加强支护。现行喷锚网支护效果不佳的关键因素是水泥砂浆锚杆的杆体长度偏短和锚固力不足,不能提供径向应力,同时金属网、喷浆都存在缺陷。当系统布置多根预应力锚杆时,相邻杆体的锥形压缩区便互相重叠,在巷道周边会形成连续的岩体承载环。改进后的预应力中空注浆锚杆+TECCO网+喷射混凝土的支护效果要好于现行的普通砂浆锚杆喷锚网支护。
[Abstract]:The problem of roadway support with high ground stress is one of the more complicated research topics in the field of rock mechanics. For a long time, domestic and foreign workers engaged in mining, tunnel engineering and rock mechanics theory research and practice, in the high-stress roadway failure mechanism and support technology has carried out a lot of research. However, the engineering geological conditions of high ground stress roadway are usually complicated, so it is difficult to study this problem. Due to the breakage of surrounding rock and the prominent tectonic stress, many roadways in Jinchuan mining area have serious deformation and destruction in the process of construction and mining. Although the support method of ordinary mortar bolt metal mesh shotcrete used in mining area can control the deformation of roadway to a certain extent, the supporting effect is not ideal. Many roadways have been repaired many times, and the support cost of roadway is high. For many years, the company has been looking for a new way of supporting, hoping to solve the problem of bad roadway support to some extent. In this paper, a series of research has been carried out on the experimental section 1438 of Jinchuan No.3 Mine. Firstly, the deformation and failure characteristics of roadway are analyzed by field investigation and related data, and the reasons of failure of roadway with high ground stress and the existing problems in supporting are analyzed. Combined with the actual situation of the roadway test section, the corresponding improvement measures are put forward, and the improved support scheme is drawn up, and the improved support scheme is compared with the existing support scheme by numerical simulation. The support scheme is evaluated by the data monitoring results of the field support test. Based on the experimental study of 1438 section roadway support in Jinchuan, the following conclusions are drawn. Shear damage is easy to occur at the foot of the straight wall of the roadway, so it is necessary to strengthen the support. The key factors of poor supporting effect of shotcrete anchor mesh are short length of cement mortar bolt and insufficient anchoring force, which can not provide radial stress. At the same time, there are defects in metal mesh and jet grouting. When several prestressed anchors are arranged in the system, the conical compression zone of adjacent rods overlaps with each other, and a continuous rock bearing ring is formed around the roadway. The improved TECCO mesh shotcrete support of prestressed hollow grouting bolt is better than that of common mortar anchor bolt.
【学位授予单位】：西南科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD353

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