基于围岩参数反演的隧道稳定性研究
发布时间：2018-08-12 12:20
【摘要】：随着我国交通建设不断发展,公路隧道的数量与日俱增,而隧道的稳定性成为备受关注的问题。鉴于隧道岩体的高度复杂性,很难一蹴而就地获得准确的围岩参数进行评价隧道的稳定性,因此就必须充分利用施工中获取的监控量测数据反演计算所需要的围岩参数。在这个思路指导下,论文以在建的汶马高速公路鹧鸪山隧道工程为工程依托,根据施工期间的现场监控量测数据,借助岩土工程有限差分软件FLAC 3D建立正演模型和计算,建立和优化反演模型,运用大型计算软件MATLAB反演计算隧道围岩参数,利用反演计算获得的围岩参数分析隧道的稳定性。研究的主要内容包括以下几个方面：(1)监测数据的回归分析和隧道的施工管理根据工程的实际情况以及新奥法施工的理念,制定隧道的监控量测方案,实施施工期间的监控量测,对现场监控量测数据进行整理、处理和回归分析,分析围岩的变形规律,并建立了鹧鸪山隧道的信息反馈与施工管理机制。(2)正演模型的建立和计算根据鹧鸪山隧道的地质资料、地质勘查、地质预报等相关资料,确定隧道围岩的物理力学参数取值范围,采用正交试验和均匀试验原理设计围岩的物理力学参数组合,利用功能强大的岩土工程软件FLAC 3D建立三维隧道正演分析模型,计算相应位置的拱顶沉降和水平收敛,作为BP神经网络的训练样本和测试样本。在此基础上,采用正交试验的矩阵分析法分析了各个围岩参数影响隧道变形的主次顺序。(3)反演模型的建立和参数计算建立并优化BP神经网络的结构,采用“后验差法”判定其预测能力,建立适合该隧道围岩物理力学参数的反演计算模型,结合施工期间现场实际监控量测的结果,运用MATLAB进行反演计算隧道围岩的物理力学参数。根据反演计算获得的围岩物理力学参数,计算对应断面的拱顶沉降值和水平收敛值,及其与实测值之间的误差,进一步验证了围岩参数反演的科学性和可行性。(4)反演结果在隧道施工中的应用基于反演计算获得的围岩物理力学参数,建立隧道施工的三维计算模型,采用强度折减法进一步分析了隧道围岩的稳定性、埋深对隧道围岩稳定性的影响和衬砌结构的安全性,同时分析和研究了提高隧道稳定性的措施。
[Abstract]:With the continuous development of traffic construction in China, the number of highway tunnels is increasing day by day, and the stability of tunnels has become a matter of great concern. In view of the high complexity of the tunnel rock mass, it is difficult to obtain accurate surrounding rock parameters to evaluate the stability of the tunnel overnight. Therefore, it is necessary to make full use of the monitoring and measurement data obtained in construction to inverse the surrounding rock parameters required for the calculation. Under the guidance of this idea, based on the construction of the Partridge Mountain Tunnel of Wenma Expressway, the forward modeling and calculation are established by the help of the geotechnical engineering finite difference software FLAC 3D, according to the field monitoring and measuring data during the construction. The inversion model is established and optimized, and the parameters of surrounding rock of tunnel are inversed by MATLAB software, and the stability of tunnel is analyzed by the parameters of surrounding rock obtained by inversion calculation. The main contents of the study include the following aspects: (1) regression analysis of monitoring data and tunnel construction management, according to the actual situation of the project and the concept of the construction of the New Austrian method, the monitoring and measurement scheme of the tunnel is formulated. During the construction, the monitoring and measuring data are arranged, processed and regressed, and the deformation law of surrounding rock is analyzed. The information feedback and construction management mechanism of Partridge Mountain Tunnel are established. (2) the forward modeling is established and calculated according to the geological data, geological exploration, geological forecast and other related data. The range of the physical and mechanical parameters of the surrounding rock is determined, the combination of the physical and mechanical parameters of the surrounding rock is designed by orthogonal test and uniform test principle, and the 3D forward analysis model of tunnel is established by using the powerful geotechnical engineering software FLAC 3D. The dome settlement and horizontal convergence of the corresponding position are calculated as the training and test samples of BP neural network. On this basis, the primary and secondary order of the influence of surrounding rock parameters on tunnel deformation is analyzed by using the matrix analysis method of orthogonal test. (3) the establishment of inversion model and parameter calculation are used to optimize the structure of BP neural network. The prediction ability of the tunnel is determined by "posteriori difference method", and the inversion calculation model suitable for the physical and mechanical parameters of surrounding rock of the tunnel is established, and the results of actual monitoring and measurement during construction are combined. The physical and mechanical parameters of surrounding rock of tunnel are inversed by MATLAB. According to the physical and mechanical parameters of surrounding rock obtained by inverse calculation, the settlement value and horizontal convergence value of the arch roof of the corresponding section are calculated, and the errors between them and the measured values are calculated. Further verify the scientific and feasibility of parameter inversion of surrounding rock. (4) the application of inversion results in tunnel construction based on the physical and mechanical parameters of surrounding rock obtained by inversion calculation, a three-dimensional calculation model of tunnel construction is established. The stability of tunnel surrounding rock, the influence of buried depth on the stability of tunnel surrounding rock and the safety of lining structure are further analyzed by the strength reduction method. The measures to improve the stability of tunnel are also analyzed and studied.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U451
本文编号：2179037
[Abstract]:With the continuous development of traffic construction in China, the number of highway tunnels is increasing day by day, and the stability of tunnels has become a matter of great concern. In view of the high complexity of the tunnel rock mass, it is difficult to obtain accurate surrounding rock parameters to evaluate the stability of the tunnel overnight. Therefore, it is necessary to make full use of the monitoring and measurement data obtained in construction to inverse the surrounding rock parameters required for the calculation. Under the guidance of this idea, based on the construction of the Partridge Mountain Tunnel of Wenma Expressway, the forward modeling and calculation are established by the help of the geotechnical engineering finite difference software FLAC 3D, according to the field monitoring and measuring data during the construction. The inversion model is established and optimized, and the parameters of surrounding rock of tunnel are inversed by MATLAB software, and the stability of tunnel is analyzed by the parameters of surrounding rock obtained by inversion calculation. The main contents of the study include the following aspects: (1) regression analysis of monitoring data and tunnel construction management, according to the actual situation of the project and the concept of the construction of the New Austrian method, the monitoring and measurement scheme of the tunnel is formulated. During the construction, the monitoring and measuring data are arranged, processed and regressed, and the deformation law of surrounding rock is analyzed. The information feedback and construction management mechanism of Partridge Mountain Tunnel are established. (2) the forward modeling is established and calculated according to the geological data, geological exploration, geological forecast and other related data. The range of the physical and mechanical parameters of the surrounding rock is determined, the combination of the physical and mechanical parameters of the surrounding rock is designed by orthogonal test and uniform test principle, and the 3D forward analysis model of tunnel is established by using the powerful geotechnical engineering software FLAC 3D. The dome settlement and horizontal convergence of the corresponding position are calculated as the training and test samples of BP neural network. On this basis, the primary and secondary order of the influence of surrounding rock parameters on tunnel deformation is analyzed by using the matrix analysis method of orthogonal test. (3) the establishment of inversion model and parameter calculation are used to optimize the structure of BP neural network. The prediction ability of the tunnel is determined by "posteriori difference method", and the inversion calculation model suitable for the physical and mechanical parameters of surrounding rock of the tunnel is established, and the results of actual monitoring and measurement during construction are combined. The physical and mechanical parameters of surrounding rock of tunnel are inversed by MATLAB. According to the physical and mechanical parameters of surrounding rock obtained by inverse calculation, the settlement value and horizontal convergence value of the arch roof of the corresponding section are calculated, and the errors between them and the measured values are calculated. Further verify the scientific and feasibility of parameter inversion of surrounding rock. (4) the application of inversion results in tunnel construction based on the physical and mechanical parameters of surrounding rock obtained by inversion calculation, a three-dimensional calculation model of tunnel construction is established. The stability of tunnel surrounding rock, the influence of buried depth on the stability of tunnel surrounding rock and the safety of lining structure are further analyzed by the strength reduction method. The measures to improve the stability of tunnel are also analyzed and studied.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U451
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