【作者】 马建超；

【导师】 丁卫华；

【作者基本信息】 西安理工大学 ， 岩土工程， 2008， 硕士

【摘要】 渗水和涌水是公路隧道施工中常见的主要地质灾害,也是运营中的主要病害。在深埋隧道中,隧道通过的地质条件复杂,揭示的水文地质单元较多。隧道的开挖,引起周围岩体应力重分布,同时也破坏了地下水的排泄通道。因此对隧道裂隙岩体渗流场进行观测与分析,在设计、施工中采取相应的防、排水措施对隧道施工和运行有着重要的意义。本文以蓝商高速公路李家河隧道为研究对象,进行的主要研究工作有:(1)分析了裂隙岩体渗流研究现状,明确了李家河隧道渗流分析的主要目标是正确估计水库蓄水后隧道的渗流量,为防、排水设计提供依据;(2)在隧道区域地质调查基础上,进行了隧道与水库之间裂隙调查与统计、断层调查。重点进行了隧道开挖期间渗流量的观测与分析;(3)结合现场钻孔压水实验、钻孔放水试验,初步确定了岩体的渗透系数;(4)建立了李家河隧道渗流数值模型,依据隧道开挖施工期间渗流量的现场观测结果,基于软件GEO-SLOPE的模拟分析反演得到分区渗流参数分布;(5)根据求得的渗流参数分布场,模拟了李家河水库蓄水后隧道的渗漏量,为隧道的防、排水设计提供了依据。在渗流分析过程中,对考虑耦合与不考虑耦合作用进行了比较。得出如下结论:(1)通过现场观察、实测,获得了隧道开挖状态下的渗漏状态和隧道总的渗漏量。(2)隧洞涌水预测中,考虑渗流场与应力场的耦合作用得到的渗漏量比不考虑耦合时大30%以上。(3)通过反复调整渗透系数,模拟天然渗流状态下隧道的渗流量使之与实测渗流量相符,从而得出准确的渗透系数。(4)根据反演得到的分区渗流参数分布,经模拟获得了水库蓄水后总的隧道渗水量。(5)根据模拟计算的隧道渗水量,提出隧道防渗设计依据的建议。分析现场的渗流状态,提出修改设计的建议:以排为主,渗流量较大部位增加灌浆措施,减小渗漏量,减轻排水设施的压力。更多还原

【Abstract】 Tunnel flooding is the common main geological disaster in the tunnel construction and operation. In deeply buried tunnel, geology condition is complex. Many geological units are opened out. Tunnel excavating, causes stress heavy distribution of rock mass in tunnel. Meanwhile destroyed the ground-water drainage channel.Therefore, It is very significant for observation and analysis of the rock mass infiltration flow fields in tunnel and adopting bailing technique in designation and construction of stress fields coupling.In this article, the research object is Li Jiahe tunnel on Xi’an-Hefei highway, The main research work:(1)Analysis the status of fractured rock flow ,nail down the main object of Li jiahe tunnel Seepage analysis is estimating tunnel seepage discharge after water level of reservoir reach 880m, provide the basis for the drainage design;(2) Basis on the regional geological survey In the tunnel, investigate and statistic the cranny and faultage between tunnel and reservoir, investigate hydrogeological background of Li jiahe tunnel, focusing on seepage discharge observation and record during the excavation of the tunnel.(3) Bored with the scene of the pressurised water, drilling water test, firstly determined the rock permeability coefficient; (4) Established a seepage numerical model of Li jiahe tunnel, based on the seepage discharge observations at the scene during the excavation of the tunnel, based GEO-SLOPE software simulation analysis get hold of district parameters of seepage;(5) According to achieve the flow parameters distribution, simulation the leakage of the tunnel after Water Level of Reservoir reach 880m, provide the basis for the drainage design. In the process of seepage analysis, compared consider coupling with not consider coupling. Reached the following conclusions:(1) Through field observation and measurement has obtained under the tunnel excavation condition leakage condition and the tunnel total leakage quantity.(2) Tunnel wells up in the water forecast, considered infiltrates the flow field and the stress field coupling function in a big way obtains the leakage quantity compares does not consider when the coupling above 30%.(3) Through adjusts the penetration coefficient repeatedly, under the simulation natural transfusion condition the tunnel seepage quantity causes it with the actual seepage quantity match case, thus obtains the accurate penetration coefficient.(4) According to the partition seepage parameter distribution in back analysis, obtained the tunnel’s leakage quantity after Li Jiahe reservoir storage by simulation.(5) Basis analog computation tunnel seep quantity, proposed the tunnel guards against infiltrates the design basis the suggestion. Analyzes the scene the transfusion condition, puts forward the revision design proposal: By the row primarily, the seepage quantity big spot increases the grouting measure, reduces the leakage quantity, reduces the draining water facility the pressure.更多还原