基于数值模拟的抚松隧道稳定性评价及因素敏感性分析
发布时间：2019-01-09 18:12
【摘要】：隧道工程建设中,关键问题之一就是如何评价和保证隧道的稳定性。本文以抚松隧道工程为背景,采用数值模拟法、强度折减法、正交试验设计法、极差分析法研究复杂条件下隧道稳定性评价方法,以此来完善隧道稳定性评价的理论方法体系,这对隧道的合理设计、安全施工、支护方案调整具有十分重要的指导意义。具体研究内容如下：(1)对抚松隧道左洞ZK275+203-ZK275+239段进行区域三维数值建模,依次分析隧道在超前小导管双侧壁导洞法和全断面法施工工艺下的稳定性、隧道在考虑渗流与不考虑渗流时的稳定性以及隧道在地震作用下的稳定性。研究结果表明,隧道开挖过程中,相比全断面法,采用双侧壁导洞法在控制围岩变形方面具有较好的优势；渗流存在对隧道稳定性的影响很大；横向水平地震作用下,隧道衬砌的连接部位特别是拱脚是隧道抗震的薄弱环节。(2)基于强度折减技术,研究隧道在不同工况作用下的稳定程度与破坏规律。研究结果表明,抚松隧道在不同工况作用下的最小安全系数有比较大的差异,其中水存在的工况隧道的安全系数最小,稳定性最差,更易导致隧道发生坍塌；锚杆支护的施加能大大提高隧道的稳定性,同时锚杆施加时的环向间距布设方案的不同也会导致隧道稳定性提高幅度的不同。(3)为了解决数值模拟锚杆的作用通常不能充分发挥,无法分析判断锚杆因素敏感性的强弱的问题,将锚杆效应模拟与强度折减法相结合进行锚杆参数敏感性分析,经过试算,本文将岩土剪切强度以折减系数2.5折减后,锚杆作用得到有效的发挥,进而能进行锚杆因素敏感性的判断。利用正交试验设计法对岩土因素和锚杆因素设定试验方案,采用极差分析法对正交设计方案的有限元结果进行敏感性分析。研究结果表明,岩土因素弹性模量和锚杆因素环向间距是敏感性强的因素,对隧道围岩稳定性影响很大。
[Abstract]:One of the key problems in tunnel construction is how to evaluate and ensure the stability of tunnel. Taking Fusong tunnel engineering as the background, this paper uses numerical simulation method, strength reduction method, orthogonal test design method and range analysis method to study the evaluation method of tunnel stability under complex conditions, so as to perfect the theoretical and methodological system of tunnel stability evaluation. This is of great significance to the reasonable design, safe construction and support scheme adjustment of the tunnel. The specific research contents are as follows: (1) Regional 3D numerical modeling of the ZK275 203-ZK275 239 section of the left tunnel of Fusong tunnel is carried out, and the stability of the tunnel under the construction technology of leading small ducts with double sidewall guide and full section method is analyzed in turn. The stability of tunnel considering seepage and not considering seepage, and the stability of tunnel under earthquake. The results show that, compared with the full-section method, the double-sidewall tunnel method has a good advantage in controlling the surrounding rock deformation, and the seepage has a great influence on the stability of the tunnel. Under the lateral horizontal earthquake, the connecting position of tunnel lining, especially the arch foot, is the weak link of the tunnel seismic resistance. (2) based on the strength reduction technique, the stability and failure law of the tunnel under different working conditions are studied. The results show that the minimum safety factor of Fusong tunnel under different working conditions is quite different. The tunnel with water has the lowest safety factor and the worst stability, which is more likely to cause the tunnel collapse. The application of bolting can greatly improve the stability of the tunnel. At the same time, the different arrangement schemes of the circumferential spacing when the anchor rod is applied will also lead to the different amplitude of the tunnel stability. (3) in order to solve the problem of numerical simulation, the role of the anchor rod is usually not fully played. It is impossible to analyze and judge the sensitivity of anchor rod factors. The anchor effect simulation is combined with strength reduction method to analyze the sensitivity of anchor parameters. After trial calculation, the shear strength of rock and soil is reduced by the reduction coefficient of 2.5, in this paper, the shear strength of rock and soil is reduced by the coefficient of 2.5. The role of anchor can be played effectively, and then the sensitivity of anchor can be judged. The orthogonal design method is used to set the test scheme for geotechnical factors and anchor elements. The sensitivity of the finite element results of the orthogonal design scheme is analyzed by using the range analysis method. The results show that the elastic modulus of rock and soil factors and the circumferential spacing of anchor elements are sensitive factors which have great influence on the stability of tunnel surrounding rock.
【学位授予单位】：大连海事大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U451
本文编号：2405926
[Abstract]:One of the key problems in tunnel construction is how to evaluate and ensure the stability of tunnel. Taking Fusong tunnel engineering as the background, this paper uses numerical simulation method, strength reduction method, orthogonal test design method and range analysis method to study the evaluation method of tunnel stability under complex conditions, so as to perfect the theoretical and methodological system of tunnel stability evaluation. This is of great significance to the reasonable design, safe construction and support scheme adjustment of the tunnel. The specific research contents are as follows: (1) Regional 3D numerical modeling of the ZK275 203-ZK275 239 section of the left tunnel of Fusong tunnel is carried out, and the stability of the tunnel under the construction technology of leading small ducts with double sidewall guide and full section method is analyzed in turn. The stability of tunnel considering seepage and not considering seepage, and the stability of tunnel under earthquake. The results show that, compared with the full-section method, the double-sidewall tunnel method has a good advantage in controlling the surrounding rock deformation, and the seepage has a great influence on the stability of the tunnel. Under the lateral horizontal earthquake, the connecting position of tunnel lining, especially the arch foot, is the weak link of the tunnel seismic resistance. (2) based on the strength reduction technique, the stability and failure law of the tunnel under different working conditions are studied. The results show that the minimum safety factor of Fusong tunnel under different working conditions is quite different. The tunnel with water has the lowest safety factor and the worst stability, which is more likely to cause the tunnel collapse. The application of bolting can greatly improve the stability of the tunnel. At the same time, the different arrangement schemes of the circumferential spacing when the anchor rod is applied will also lead to the different amplitude of the tunnel stability. (3) in order to solve the problem of numerical simulation, the role of the anchor rod is usually not fully played. It is impossible to analyze and judge the sensitivity of anchor rod factors. The anchor effect simulation is combined with strength reduction method to analyze the sensitivity of anchor parameters. After trial calculation, the shear strength of rock and soil is reduced by the reduction coefficient of 2.5, in this paper, the shear strength of rock and soil is reduced by the coefficient of 2.5. The role of anchor can be played effectively, and then the sensitivity of anchor can be judged. The orthogonal design method is used to set the test scheme for geotechnical factors and anchor elements. The sensitivity of the finite element results of the orthogonal design scheme is analyzed by using the range analysis method. The results show that the elastic modulus of rock and soil factors and the circumferential spacing of anchor elements are sensitive factors which have great influence on the stability of tunnel surrounding rock.
【学位授予单位】：大连海事大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U451
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