双碑隧道富水段开挖渗流特征分析

发布时间：2018-01-06 03:08

本文关键词：双碑隧道富水段开挖渗流特征分析　出处：《重庆交通大学》2014年硕士论文　论文类型：学位论文

【摘要】：重庆双碑隧道所穿越山脉为中梁山，，中梁山为沙坪坝区最高山，山上鱼塘、水库数量众多，地下水储量丰富，并且地表水与地下水联系密切；中梁山以泥质岩、泥岩夹粉沙岩、石英粉沙岩分布为主。本文以重庆市在建双碑隧道工程为背景，进行了以下几个方面的研究： ①对裂隙岩体富水数学模型作了系统分析，包括等效连续介质模型、双重介质模型、裂隙网络模型等，同时提出了与裂隙岩体地下水渗流相适应的耦合数学模型。通过耦合效应分析，建立起岩体中地下水与固体骨架之间的力学特征关系，从而真实地反映围岩实际工作状态。 ②运用镜像法求解了隧道工程中几种比较常见的不良地质条件下的稳定渗流问题。其中包括：隧道下卧隔水层、隧道附近存在断层、隧道附近存在溶洞。同时利用复变函数保角变换原则，推导了重力场作用下均质连续围岩中隧道渗流场分布方程。 ③利用有限差分软件FLAC3D建立双碑隧道三维数值分析模型，通过计算分析，揭示了隧道开挖过程地下水压分布规律，以及渗流作用对围岩应力和变形的影响。同时对影响裂隙岩体流固耦合效应的主要因素，包括不同围岩级别、不同埋深、不同地下水位等，分别进行了数值模拟分析，揭示了围岩受力及变形在单一因素影响下的变化规律。 ④对现场监控量测数据进行了分析，同时与处在三种不同地下水位下的数值模拟结果进行了对比分析，对模拟结果的合理性作出判定。
[Abstract]:Chongqing Shuangbei tunnel through mountains in Liangshan, in Liangshan for the Shapingba mountain area, Hill ponds, reservoirs are numerous, groundwater reserves are abundant, and closely contact surface water and groundwater in Liangshan; mud rock, mudstone and siltstone, sandstone and quartz powder distribution. This paper takes Chongqing city construction Shuangbei tunnel project as background, focuses on the following aspects:
As the system analysis of the fractured rock rich water mathematical model, including the equivalent continuous medium model and double medium model, fracture network model, and puts forward to adapt with the coupled mathematical model of groundwater seepage in fractured rock. Through coupling effect analysis, establish the relationship between groundwater and solid mechanics characteristic of rock mass, so true to reflect the actual working state of the surrounding rock.
Using the image method to solve the seepage problem of adverse geological conditions of tunnel engineering in some of the more common conditions. Including: tunnel underlying aquiclude, faults near the tunnel, karst cave near the tunnel. At the same time using conformal transformation principle, homogeneous rock derived gravity field in tunnel seepage distribution equation.
The establishment of the Shuangbei tunnel using finite difference numerical analysis model of software FLAC3D, through calculation and analysis, reveals the tunnel excavation process of underground water distribution, seepage and stress and deformation of surrounding rock. At the same time, the main factors affecting the coupling effect of fractured rock, including different rock mass, different depth. Different underground water level, numerical simulations were carried out analysis, reveals the surrounding rock stress and deformation variation in a single factor.
Fourth, the field monitoring data are analyzed, and the numerical simulation results are compared with those under three different groundwater levels, and the rationality of the simulation results is determined.

【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.49

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