基于限量排放思想的隧道防排水理论技术研究

发布时间：2018-06-21 18:34

本文选题：隧道 + 限量排放　；参考：《重庆交通大学》2014年硕士论文

【摘要】：隧道渗漏水是已建隧道中普遍存在的病害。渗漏水使路面湿滑，威胁行车安全；渗漏水增加洞内湿度，降低洞内设施的工作效率；在寒区渗漏水还会引发各种冻害，进一步恶化隧道运营环境。隧道渗漏水是隧道设计、施工和运营中要解决的突出问题，隧道防排水和渗漏治理己经成为隧道工程建设的一大关键课题。目前，隧道建设己慢慢摒弃“以排为主”的理念，开始推行“以堵为主，限量排放”的新型防排水原则。本文以京广线大瑶山1号隧道为工程背景，主要对隧道限量排水技术进行以下方面的研究工作： ①岩体的力学特性和渗流特性不同于一般的均匀介质。岩体赋存于一定地质环境中，经过漫长的地质构造作用，，形成连续性状的岩石材料和非连续性状的各种地质结构面组成的复杂地质体。本文在分析研究各类裂隙岩体渗流理论及其基本方程的基础上，综合论述了裂隙岩体的渗流特征、结构特征以及渗流理论的发展与演变； ②在调研了流固耦合相关理论及其基本方程的基础上，介绍了裂隙岩体数值模拟常用的三类模型，综合论述了地下水对岩体的作用效应，主要包括地下水对岩体的力学作用、地下水对岩石强度的弱化作用、渗流对围岩应力场的影响等。 ③通过采用COMSOL多物理场耦合分析软件进行数值模拟分析，介绍了大瑶山1号隧道分析模型的建立过程，讨论了各参数取值及边界条件。研究地下水位、注浆与否、注浆厚度等渗流场控制因素对渗流场、围岩应力和位移分布的影响规律，为实际隧道堵水限排时的应力与变形控制提供相应的理论依据。 ④通过数值模拟得知：围岩的地下水位对渗流场影响较大，注浆与否对围岩的渗流场与应力场的影响均很大，如注浆前tresca应力值约比注浆后应力值大35%，而注浆厚度、系数的改变可以明显的从各场的数值变化判断注浆堵水的效果，从而选取最合理的注浆方案，如K=1E-5m/d提升到K=1E-4m/d，z向正位移减小0.61%；负位移增大1.34%。全文内容的研究重点在于对京广线大瑶山1号隧道近地表水库注浆工程用数值模拟进行工程实例模拟，为实际工程施工选取合理方案，对该工程的施工具有积极的指导意义。
[Abstract]:Tunnel leakage is a common disease in built tunnels. Leakage of water makes the road wet and slippery, threatens the safety of driving; increases the humidity in the tunnel and reduces the working efficiency of the facilities in the tunnel; leakage of water in the cold region will also cause all kinds of freezing damage and further worsen the tunnel operating environment. Tunnel leakage is a prominent problem to be solved in tunnel design, construction and operation. Tunnel waterproof, drainage and seepage treatment have become a key issue in tunnel construction. At present, tunnel construction has gradually abandoned the idea of "drainage as the main", and began to implement the new principle of "blockage, limited discharge". Taking Dayaoshan No.1 Tunnel of Jingguang Line as the engineering background, this paper mainly studies the limited drainage technology of the tunnel in the following aspects: (1) the mechanical properties and seepage characteristics of rock mass are different from those of general uniform medium. The rock mass exists in a certain geological environment, and through the long geological structure process, it forms a complex geological body composed of continuous rock materials and discontinuous geological structural planes. Based on the analysis and study of seepage theory and its basic equations of fractured rock mass, the seepage characteristics, structure characteristics and the development and evolution of seepage theory of fractured rock mass are comprehensively discussed in this paper. Based on the investigation of the fluid-solid coupling theory and its basic equations, three kinds of models used in numerical simulation of fractured rock mass are introduced, and the effect of groundwater on rock mass is discussed synthetically. It mainly includes the mechanical effect of groundwater on rock mass, the weakening effect of groundwater on rock strength, and the influence of seepage on stress field of surrounding rock. 3 numerical simulation analysis is carried out by using COMSOL multi-physical field coupling analysis software. This paper introduces the establishment of analytical model for Dayaoshan No. 1 Tunnel, and discusses the values of each parameter and boundary conditions. The influence of seepage field control factors such as groundwater level, grouting or not and grouting thickness on seepage field, stress and displacement distribution of surrounding rock are studied. It provides the corresponding theoretical basis for the stress and deformation control of the actual tunnel water shutoff and drainage. 4 through numerical simulation, it is found that the underground water level of surrounding rock has a great influence on the seepage field. The influence of grouting on the seepage field and stress field of surrounding rock is very great, for example, the stress value of tresca before grouting is about 35% larger than that after grouting, and the change of grouting thickness and coefficient can obviously judge the effect of water plugging by grouting according to the numerical change of each field. Thus, the most reasonable grouting scheme is selected, for example, the positive displacement decreases by 0.61m / d, the negative displacement increases by 1.34m / d, and the positive displacement decreases by 0.61g / d to 1E-4m / dndnd, and the negative displacement increases by 1.34m / d. This paper focuses on the numerical simulation of the grouting project of Dayaoshan No. 1 tunnel near the surface of the Jingguang Line, which is of positive guiding significance for the construction of the actual project by selecting a reasonable scheme for the actual construction.
【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】：U453.6

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