特大断面隧道开挖方法优化分析及施工响应研究

发布时间：2018-05-06 12:10

本文选题：特大断面隧道 + 开挖方法　；参考：《福建工程学院》2017年硕士论文

【摘要】：论文以我国在大规模修建的城市地铁隧道为背景,采用了技术调研、理论分析、数值模拟、监控量测等多种手段,对特大断面隧道开挖方法优化、特大断面隧道施工过程力学性态仿真、特大断面隧道施工围岩稳定监控量测等进行了深入系统地研究,主要研究工作和成果如下:(1)通过分析台阶法的原理,并依此构建了统一的水平分层模型。该模型可以通过调整分层数和台阶高度有效地解释比如三台阶法等分层类施工方法,并进行基于AHP方法的方案优化比选举例,在考虑地表沉降、掌子面挤出、施工难度和开挖尺寸四个准则情况下,选出了最优开挖方案。(2)通过分析常见施工方法CD法和CRD法等,类比水平分层模型构建了统一的横向分块模型,该模型可以通过调整横向分块数和分块宽度有效地解释和优化各类横向分块类的施工方法。(3)通过综合水平分层模型和横向分块模型构建了统一的平面分区模型,该模型可以通过水平分层数、横向分快数、台阶高度、分块宽度等四个参数解释平面优化的所有问题,同时对并进行了当i=2,j=2时平面分区模型利用动态规划理论(DP)进行了方案优化举例。(4)通过分析开挖进尺问题,类比平分层模型和横向分块模型构建了统一的纵向分段模型,主要确定参数分段数和分段长度,同时也基于AHP进行了分析优化方案。(5)通过综合平面分区模型和纵向分段优化模型可以得到三维分体模型,该模型可以解释和用于所有隧道开挖方法和优化问题。通过调整水平分层数、横向分快数、台阶高度、分块宽度、分段数和分段长度等六个参数可以解释所有施工方法并能够依此进行隧道开挖方法的优化。(6)综合了动态规划理论(DP)和层次分析法(AHP)的各自优点,在特大断面隧道开挖方法优化中,将隧道开挖多目标多过程的问题,通过DP_AHP法能够有效进行优化和决策,从而有效解决,最终提出最优的施工方案。(7)本文对重庆地铁十号线中央公园东站大断面隧道开挖进行了优化前后方案数值仿真计算。分别从位移场、应力场和塑性区的分析了优化前后围岩稳定变形破坏规律。发现对于施工方法的优化,满足施工要求。(8)对重庆轨道交通十号线中央公园东站特大断面隧道采用9步开挖工艺方法施工进行监控量测,对监控量测结果与数值模拟结果进行对比分析。结果表明前面做的9部开挖法优化方案有效,变形规律相同和变形量处于同一数量水平。
[Abstract]:Based on the large-scale construction of urban subway tunnel in our country, this paper optimizes the excavation method of the tunnel with large cross-section by means of technical investigation, theoretical analysis, numerical simulation, monitoring and measurement, etc. The mechanical behavior simulation of the construction process of the large section tunnel and the monitoring and measurement of the surrounding rock stability in the construction of the large section tunnel are deeply and systematically studied. The main research work and results are as follows: 1) through the analysis of the principle of the step method, Based on this, a unified horizontal stratification model is constructed. The model can effectively explain the layered construction methods such as three class method by adjusting the number of layers and the height of step, and compare and select the scheme optimization based on AHP method, considering the ground subsidence and the extrusion of palm surface. Under four criteria of construction difficulty and excavation size, the optimal excavation scheme is selected. By analyzing the common construction methods CD method and CRD method, a unified horizontal block model is constructed by analogy with horizontal stratification model. The model can effectively explain and optimize the construction method of all kinds of transverse block classes by adjusting the number and width of transverse blocks. The unified plane partition model is constructed by synthesizing the horizontal stratification model and the horizontal block model. The model can explain all the problems of plane optimization by four parameters, such as horizontal stratification number, lateral fast number, step height, block width, etc. At the same time, the paper gives an example of scheme optimization by using dynamic programming theory to optimize the plan of the plane partition model with the help of dynamic programming theory (DP2). By analyzing the problem of the excavation scale, a unified longitudinal segmenting model is constructed by analogy with the horizontal stratification model and the horizontal block model, and is compared with the horizontal stratification model and the horizontal block model. This paper mainly determines the number of segments and the length of the segments, and also analyzes the optimization scheme based on AHP. (5) by synthesizing the planar partition model and the longitudinal segmented optimization model, the three-dimensional split-body model can be obtained. The model can be interpreted and applied to all tunnel excavation methods and optimization problems. By adjusting the number of horizontal layers, the number of transversal splitters, the height of steps, the width of blocks, The six parameters, such as segment number and segment length, can explain all construction methods and can be used to optimize tunnel excavation method. It integrates the respective advantages of dynamic programming theory (DPDP) and analytic hierarchy process (AHP). In the optimization of tunnel excavation method with large section, the problem of multi-objective and multi-process of tunnel excavation can be solved effectively by DP_AHP method. Finally, the optimal construction plan is put forward.) in this paper, the numerical simulation of the large section tunnel excavation of the Central Park East Station of Chongqing Metro Line 10 is carried out before and after optimization. According to the displacement field, stress field and plastic zone, the stable deformation and failure law of surrounding rock before and after optimization are analyzed. It is found that for the optimization of the construction method to meet the construction requirements, the monitoring and measurement of the construction of the extraordinarily large section tunnel of the Central Park East Station of Chongqing Rail Transit Line 10 using the 9-step excavation technology method is carried out. The results of monitoring measurement and numerical simulation are compared and analyzed. The results show that the nine excavation methods are effective, the deformation law is the same and the deformation quantity is at the same level.
【学位授予单位】：福建工程学院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U456.3

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