【摘要】：高地應力巷道支護問題是巖石力學領域比較復雜的世界性研究課題之一。長期以來國內外從事采礦、隧道工程及巖石力學理論研究與實踐的工作者,在高應力巷道破壞機理和支護技術方面進行了大量研究。但由于高地應力巷道工程地質條件通常比較復雜,因此對該問題的研究有一定的困難。金川礦區(qū)由于圍巖破碎,構造應力突出,在基建和開采過程中,許多巷道發(fā)生嚴重變形和破壞。礦區(qū)現(xiàn)用的普通砂漿錨桿+金屬網+噴射混凝土的支護方式雖能在一定程度上控制巷道變形,但支護效果并不理想。許多巷道多次修復,巷道支護成本居高不下。多年來,公司一直在尋求新的支護方式,希望能夠在一定程度上解決不良巷道的支護問題。本文以金川三礦1438試驗段為研究對象,進行了一系列研究。首先,通過現(xiàn)場調查及相關資料來分析巷道的變形破壞特征;其次分析了高地應力巷道的破壞原因與目前支護中存在的問題;并結合該巷道試驗段的實際情況提出相應的改進措施,擬定了改進后的支護方案,并用數(shù)值模擬手段對改進后的支護方案與現(xiàn)用的支護方案進行比較;最后,通過現(xiàn)場支護試驗的數(shù)據監(jiān)測結果對采用的支護方案進行評價。通過金川1438分段巷道支護試驗研究,得出以下結論。巷道直墻腳處容易發(fā)生剪切破壞,需加強支護�，F(xiàn)行噴錨網支護效果不佳的關鍵因素是水泥砂漿錨桿的桿體長度偏短和錨固力不足,不能提供徑向應力,同時金屬網、噴漿都存在缺陷。當系統(tǒng)布置多根預應力錨桿時,相鄰桿體的錐形壓縮區(qū)便互相重疊,在巷道周邊會形成連續(xù)的巖體承載環(huán)。改進后的預應力中空注漿錨桿+TECCO網+噴射混凝土的支護效果要好于現(xiàn)行的普通砂漿錨桿噴錨網支護。
[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.
【學位授予單位】：西南科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TD353

【參考文獻】

相關期刊論文 前2條

1 董方庭，宋宏偉，郭志宏，鹿守敏，，梁士杰;巷道圍巖松動圈支護理論[J];煤炭學報;1994年01期

2 于學馥;喬端;;軸變論和圍巖穩(wěn)定軸比三規(guī)律[J];有色金屬;1981年03期

相關碩士學位論文 前1條

1 郭守泉;礦井深部開采礦壓與支護技術研究[D];遼寧工程技術大學;2005年

本文編號：2141539