渝昆高速铁路彝良隧道高地温工程地质特性分析  

Analysis of Geological Characteristics of the High Geothermal Temperature of Yiliang Tunnel of Chongqing-Kunming High-speed Railway

作　　者：刘观龙 任金龙[1] 宋章[1] LIU Guanlong;REN Jinlong;SONG Zhang(China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China)

机构地区：[1]中铁二院工程集团有限责任公司,成都610031

出　　处：《高速铁路技术》2023年第3期107-111,共5页High Speed Railway Technology

摘　　要：拟建渝昆高速铁路通过云贵高原斜坡过渡带,地质条件复杂,深埋长大隧道多,其中彝良隧道存在高地温工程地质问题。本文根据彝良隧道水文地质调绘及深孔测试等成果,对该隧道高地温可能存在的热源进行了分析,根据隧道地温测试情况,对隧道高地温进行了危害性分级。研究结果表明:(1)拟建彝良隧道区地表无热泉出露,深孔最高实测井温为39.31℃;(2)彝良隧道地热热储层为志留系中统大路寨组(S_(2)d),地热增温类型为地温梯度增温,地下热能的赋存形式为热水型;(3)彝良隧道在接收大气降水和地表径流补给后,地下水自北东向南西,沿大路寨组(S_(2)d)地层中岩溶裂隙或局部的管道顺龙池背斜轴往倾伏端深部径流,受地温梯度增温作用,形成高温热水,赋存于热储层大路寨组(S_(2)d)中;(4)彝良隧道D4K 320+900~D4K321+300、D4K326+190~D4K327+500段属低高温带,热害轻微;D4K321+300~D4K326+190段属中高温带,热害中等。研究成果可为隧道设计和施工提供参考依据。The proposed Chongqing-Kunming High-speed Railway passes through the slope transition zone of the Yunnan-Guizhou Plateau,with complex geological conditions and many deep long tunnels,among which,Yiliang Tunnel has high geothermal problems.According to the results of hydrogeological mapping and deep hole testing of Yiliang Tunnel,the possible heat sources of high geothermal temperature in the tunnel are analyzed,and the hazard classification of high geothermal temperature in the tunnel is carried out according to the test results of tunnel geotemperature.The results of the study show that:(1)No hot springs are exposed on the surface of the proposed Yiliang Tunnel Area,and the maximum measured well temperature of deep holes is 39.31°C.(2)The geothermal reservoir of Yiliang Tunnel is Daluzhai Formation of Middle Silurian System(S_(2)d),the geothermal warming type is geothermal gradient warming,and the occurrence form of underground thermal energy is a hot water type.(3)After receiving atmospheric precipitation and surface runoff replenishment,the underground water of Yiliang Tunnel runs from northeast to southwest along the karst fissures in the stratum of Daluzhai Formation(S_(2)d)or local pipelines along the axis of Longchi anticline to the deep part of the dipping end.Under the action of geothermal gradient heating,high-temperature hot water is formed and stored in the geothermal reservoir Daluzhai Formation(S_(2)d).(4)D4K 320+900~D4K 321+300 and D4K 326+190~D4K 327+500 sections of Yiliang Tunnel belong to the low-high temperature zone,with slight heat damage.The section from D4K 321+300 to D4K 326+190 belongs to a medium-high temperature zone,with moderate heat damage.The conclusions can provide a reference basis for tunnel design and construction.

关 键 词：渝昆高速铁路 高原斜坡过渡带 深埋长大隧道 高地温 

分 类 号：U452.11[建筑科学—桥梁与隧道工程]