断层破碎带隧道涌水特征试验研究

发布时间：2018-12-18 19:14

【摘要】：近年来,随着我国交通建设事业的快速发展和隧道建设技术的不断提高,隧道工程向大埋深、长洞线、地质复杂、灾害频发等特点发展。其中,穿越断层破碎带隧道的涌水灾害已成为隧道施工过程中的最主要地质灾害之一,其所造成的人员伤亡及经济损失也在各类隧道地质灾害中居于前列。因此,对穿越断层破碎带隧道的掌子面防突层安全厚度和隧道发生涌水时的涌水量、水压力的变化特征进行试验研究与分析具有重要意义。本文依托岑(溪)水(汶)高速公路岑溪大隧道工程,以穿越断层破碎带的隧道为研究对象,采用模型试验和数值模拟相结合的方法,在自重应力场作用下,对无地表水补给无注浆、有地表水补给无注浆和有地表水补给预注浆的三种工况下,隧道开挖过程中的涌水特征进行研究。其主要研究内容及结论如下:1.基于相似理论,对模型试验进行设计。以几何相似常数(lC=80)、重度相似常数(?C=1)和渗透系数相似常数(kC=1)为基础,推导模型试验中其余各物理力学参数的相似常数,并配制围岩及衬砌结构的相似材料。2.在自重应力场作用下,对无地表水补给无注浆、有地表水补给无注浆和有地表水补给预注浆的三种工况下的隧道开挖进行模型试验,研究穿越断层破碎带隧道施工时的涌水特征,得出了三种工况下隧道涌水时的涌水量、水压力的变化规律及隧道发生涌水的掌子面防突层的安全厚度。3.采用有限元分析软件Midas/GTS对室内模型试验中的三种工况进行数值模拟,并将数值分析结果与模型试验结果进行对比分析,得出穿越断层破碎带隧道的涌水特征,该结论将为类似隧道施工过程中的涌水防治与处治提供一定的参考依据。
[Abstract]:In recent years, with the rapid development of traffic construction in China and the continuous improvement of tunnel construction technology, tunnel engineering has developed to the characteristics of large buried depth, long tunnel line, complex geology, frequent disasters, and so on. Among them, the water gushing disaster through the fault broken zone tunnel has become one of the most important geological disasters in the tunnel construction process, and the casualties and economic losses caused by it are also in the forefront of all kinds of tunnel geological disasters. Therefore, it is of great significance to test and analyze the safety thickness of the outburst layer on the face of the tunnel through the fault broken zone and the characteristics of the water inflow and the variation of the water pressure when the tunnel inrush occurs. Based on the Cen (Xi) Water (Wen) Expressway Cengxi large Tunnel Project, this paper takes the tunnel crossing the fault fracture zone as the research object, adopts the method of combining model test and numerical simulation, under the action of self-gravity stress field. The characteristics of water gushing during tunnel excavation were studied under three conditions of no surface water recharge without grouting and surface water recharge without grouting. The main contents and conclusions are as follows: 1. Based on the similarity theory, the model test is designed. Based on geometric similarity constant (lC=80), severe similarity constant (? Cn1) and permeability coefficient similarity constant (kC=1), the similarity constants of other physical and mechanical parameters in model tests are derived, and the similar materials of surrounding rock and lining structure are prepared. 2. Under the action of gravity stress field, the tunnel excavation under three conditions of no surface water recharge without grouting, surface water recharge without grouting and surface water recharge with pre-grouting is tested. In this paper, the characteristics of water gushing in tunnel construction through fault broken zone are studied. The water inflow, the variation of water pressure and the safety thickness of anti-outburst layer on the face of tunnel under three working conditions are obtained. The finite element analysis software Midas/GTS is used to simulate the three working conditions in the indoor model test, and the results of numerical analysis are compared with the results of the model test, and the characteristics of water gushing through the tunnel in the broken fault zone are obtained. This conclusion will provide some reference for prevention and treatment of water gushing in similar tunnel construction.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U453.61

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