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通过详细分析隧道址区水文地质资料,认为石炭系灰岩、三叠系中统河湾组白云质灰岩和上统大水塘组下段安山玄武岩为强含水层组,大量的岩溶发育于石炭系灰岩和三叠系中统河湾组白云质灰岩中。以井水断层及太元背斜为界,将研究区分为太元背斜和街子坡复式向斜2个水文地质单元,并对各单元中水量、水质与地下水的补给、径流及排泄条件等进行了说明。采取并测试了13组地下水同位素样品,结果发现,区内地下水均来源于大气降水。应用地下水动力学和降水系数法对隧道洞身的涌水量进行了预测,推断隧道的正常涌水量为56 880m3/d,最大涌水量为68 300m3/d。为防止隧道塌方,提出了“短进尺、快循环、弱爆破、少扰动、紧封闭、超前注浆”的施工方法,并要求在施工中做好超前地质预测工作。
Through detailed analysis of hydrogeological data in the tunnel area, it is concluded that the Carboniferous limestone, Triassic Zhonghewanwan dolomitic limestone and the Anchabas basalt in the lower part of the Upper Dashuitang Formation are strong aquifer formations. Carboniferous limestone and Triassic Zhonghewan Formation dolomitic limestone. Based on the well-water fault and Taiyuan anticline, the study is divided into two hydrogeological units, Taiyuan anticline and Jiezipo complex syncline, and the recharge, runoff and discharge of water, water and groundwater in each unit Etc. are described. Taken and tested 13 samples of groundwater isotopes, it was found that all the groundwater in the area came from atmospheric precipitation. The water inflow of the tunnel tunnel body was predicted by using the method of groundwater dynamics and precipitation coefficient. It was deduced that the normal water inflow was 56 880m3 / d and the maximum water inflow was 68 300m3 / d. In order to prevent the landslide of the tunnel, the construction method of “short footage, fast circulation, weak blasting, less perturbation, tight sealing and advanced grouting” was put forward and advanced geological prediction work was required in the construction.