关山隧道围岩变形破坏机理及稳定性研究
发布时间：2019-03-25 21:00
【摘要】：本文依托于天平铁路关山隧道围岩变形破坏机理的科研项目,研究区的隧道围岩以硬脆性岩体闪长岩为主,隧道最大埋深831m,属于典型的大埋深、高地应力隧道围岩变形破坏问题。目前针对这种大埋深高地应力隧道,开挖卸荷之后围岩变形破坏机理及稳定性的研究资料尚少,因此,本文旨在对大埋深高地应力特殊工程地质条件下围岩变形破坏机理及稳定性进行研究,对实际工程的指导以及科学研究具有重要意义。本文在前人研究的基础上,以现场工程地质资料、现场实测的岩体结构面统计资料、钻孔电视实验数据、岩石力学实验数据为基础,采用定性解释和定量分析相结合的思路对硬脆性岩体围岩变形破坏机理及稳定性进行研究。详细探讨高埋深高地应力隧道围岩变形破坏模式,建立一套适用于高地应力隧道围岩分级方法,进而对其稳定性进行分析评价。主要做了以下几方面研究:(1)详细分析研究区域隧道围岩赋存环境的工程地质条件,对隧道围岩赋存环境条件有整体把握,为后续研究提供相关资料。(2)对隧道掌子面进行岩体结构面统计,通过空间RQD值以及模量比随荷载夹角变化的关系图反应岩体强烈的各向异性,岩体的各向异性导致应力释放后围岩变形破坏模式不同。(3)块体理论分析结构面切割出的不稳定块体,分析围岩变形破坏模式。(4)先后两次观测同一孔裂隙变化,分析应力调整后围岩变形破坏机理。(5)变围压试验分析应力卸荷以及重新调整后的围岩变形破坏机理。(6)利用Phase2有限元程序模拟不同支护条件下隧道的开挖效应,利用强度折减法计算SRF,从而对隧道围岩稳定性进行综合评价。通过以上几方面的研究,我们认识到大埋深、高地应力隧道,开挖卸荷之后硬脆性岩体变疏松,之前被锁固的结构面张开,围岩块体沿张开的结构面发生滑移坍塌破坏,导致部分洞段混凝土开裂,钢拱架变形较为严重,但是经过较强的初期支护后,隧道围岩稳定性较好,能够满足二次衬砌的要求,围岩稳定。
[Abstract]:This paper relies on the research project of deformation and failure mechanism of surrounding rock of Guanshan Tunnel of balance Railway. The surrounding rock of tunnel in the study area is mainly diorite of hard brittle rock, and the maximum buried depth of tunnel is 831m, which belongs to the typical large buried depth. Deformation and failure of surrounding rock of high in-situ stress tunnel. At present, there are few research data on deformation and failure mechanism and stability of surrounding rock after excavation and unloading for this kind of tunnel with large buried depth and high in-situ stress. The purpose of this paper is to study the deformation and failure mechanism and stability of surrounding rock under the special engineering geological conditions of large buried depth and high in-situ stress, which is of great significance to the guidance of practical engineering and scientific research. On the basis of previous research, this paper is based on the on-site engineering geological data, the statistical data of rock mass structure plane measured on the spot, the television experiment data of drilling holes, and the data of rock mechanics experiments. The mechanism and stability of deformation and failure of the surrounding rock mass of hard and brittle rock mass are studied by means of qualitative interpretation and quantitative analysis. The deformation and failure mode of surrounding rock of high buried depth and high ground stress tunnel is discussed in detail, and a set of classification methods for surrounding rock of high ground stress tunnel is established, and then the stability of surrounding rock is analyzed and evaluated. The main contents are as follows: (1) the engineering geological conditions of the surrounding rock of regional tunnel are analyzed in detail, and the environmental conditions of the surrounding rock of the tunnel are grasped as a whole. (2) the rock mass structure surface statistics are carried out, and the strong anisotropy of the rock mass is reflected by the spatial RQD value and the relationship diagram of the modulus ratio with the load angle. The anisotropy of rock mass leads to different modes of deformation and failure of surrounding rock after stress release. (3) the block theory is used to analyze the unstable block cut by structural plane, and the deformation and failure pattern of surrounding rock is analyzed. (4) the variation of the same hole crack is observed twice. The mechanism of deformation and failure of surrounding rock after stress adjustment is analyzed. (5) the deformation and failure mechanism of surrounding rock after stress unloading and re-adjustment is analyzed by variable confining pressure test. (6) the excavation effect of tunnel under different supporting conditions is simulated by Phase2 finite element program. The strength reduction method is used to calculate SRF, to evaluate the stability of surrounding rock of tunnel. Through the above research, we realize that the tunnel with large buried depth and high in-situ stress becomes looser after excavation and unloading, the previously locked structural plane opens, and the surrounding rock mass slips and collapses along the open structural plane. The steel arch frame deformation is serious, but after the strong initial support, the surrounding rock stability of the tunnel is better, which can meet the requirements of secondary lining, and the surrounding rock is stable.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U451.2
本文编号：2447313
[Abstract]:This paper relies on the research project of deformation and failure mechanism of surrounding rock of Guanshan Tunnel of balance Railway. The surrounding rock of tunnel in the study area is mainly diorite of hard brittle rock, and the maximum buried depth of tunnel is 831m, which belongs to the typical large buried depth. Deformation and failure of surrounding rock of high in-situ stress tunnel. At present, there are few research data on deformation and failure mechanism and stability of surrounding rock after excavation and unloading for this kind of tunnel with large buried depth and high in-situ stress. The purpose of this paper is to study the deformation and failure mechanism and stability of surrounding rock under the special engineering geological conditions of large buried depth and high in-situ stress, which is of great significance to the guidance of practical engineering and scientific research. On the basis of previous research, this paper is based on the on-site engineering geological data, the statistical data of rock mass structure plane measured on the spot, the television experiment data of drilling holes, and the data of rock mechanics experiments. The mechanism and stability of deformation and failure of the surrounding rock mass of hard and brittle rock mass are studied by means of qualitative interpretation and quantitative analysis. The deformation and failure mode of surrounding rock of high buried depth and high ground stress tunnel is discussed in detail, and a set of classification methods for surrounding rock of high ground stress tunnel is established, and then the stability of surrounding rock is analyzed and evaluated. The main contents are as follows: (1) the engineering geological conditions of the surrounding rock of regional tunnel are analyzed in detail, and the environmental conditions of the surrounding rock of the tunnel are grasped as a whole. (2) the rock mass structure surface statistics are carried out, and the strong anisotropy of the rock mass is reflected by the spatial RQD value and the relationship diagram of the modulus ratio with the load angle. The anisotropy of rock mass leads to different modes of deformation and failure of surrounding rock after stress release. (3) the block theory is used to analyze the unstable block cut by structural plane, and the deformation and failure pattern of surrounding rock is analyzed. (4) the variation of the same hole crack is observed twice. The mechanism of deformation and failure of surrounding rock after stress adjustment is analyzed. (5) the deformation and failure mechanism of surrounding rock after stress unloading and re-adjustment is analyzed by variable confining pressure test. (6) the excavation effect of tunnel under different supporting conditions is simulated by Phase2 finite element program. The strength reduction method is used to calculate SRF, to evaluate the stability of surrounding rock of tunnel. Through the above research, we realize that the tunnel with large buried depth and high in-situ stress becomes looser after excavation and unloading, the previously locked structural plane opens, and the surrounding rock mass slips and collapses along the open structural plane. The steel arch frame deformation is serious, but after the strong initial support, the surrounding rock stability of the tunnel is better, which can meet the requirements of secondary lining, and the surrounding rock is stable.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U451.2
【参考文献】
相关期刊论文 前8条
1 曹运江;黄润秋;郑海君;冯涛;杨绪波;吕回;;岷江上游某水电站工程边坡软岩的崩解特性研究[J];工程地质学报;2006年01期
2 陈新瑜;310国道宝鸡-天水二级公路隧道围岩类别变更分析[J];公路交通科技;2005年S2期
3 田华;;浅议小坡山隧道渗流施工控制技术[J];科技风;2010年07期
4 李菊兵;;龙溪隧道初期支护变形机理及处治对策研究[J];路基工程;2009年04期
5 岳英龙;兰传波;李新永;;某隧道施工支护技术研究[J];黑龙江交通科技;2010年09期
6 徐书雷;肖松涛;;浅埋、破碎、涌水段围岩的隧道设计[J];西部探矿工程;2009年04期
7 谭罗荣;关于粘土岩崩解、泥化机理的讨论[J];岩土力学;2001年01期
8 高江,吕宏胜;易风化崩解砂质页岩基础的处理[J];西部探矿工程;2002年S1期
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