李健军
摘要:富水地层隧道施工易引发涌水、涌泥地质灾害,威胁施工人员生命安全,阻碍工程的顺利进行。单一的超前地质预报方法难以准确、全面的对掌子面前方地质情况进行预报,本文根据四川省南充~大竹~梁平高速公路铜锣山隧道工程地质条件,科学地运用瞬变电磁仪法与超前水平钻孔法来综合分析并预测前方地质状况,经实践检验分析和预测的结果可以有效规避工程地质灾害提供可靠的地质参考依据。
Abstract: The construction of water-rich stratum tunnel is easy to cause gushing water, mud flushing and other geological disasters, threatening the safety of construction personnel and hindering the smooth progress of the project. The advanced geological prediction method only is difficult to accurately and comprehensively predict the geological situation. According to the engineering geological conditions of the Tonggongshan tunnel of Nanchong-Dazhu-Liangping Expressway in Sichuan Province, this paper scientifically uses the transient electromagnetic method and the advanced horizontal drilling method to comprehensively analyze and predict the geological status of the front. The results of practical test analysis and prediction can provide a reliable basis to effectively avoid the geological hazards in contraction.
關键词:富水地层;涌水、涌泥;瞬变电磁仪法;超前水平钻孔法
Key words: water-rich stratum;gushing water, mud flushing;transient electromagnetic method;advanced horizontal drilling method
中图分类号:U452.1+1 文献标识码:A 文章编号:1006-4311(2017)32-0118-03
0 引言
目前隧道常用的超前地质预报方法多种多样,如地质雷达(GPR)、红外探水(infrared ray detector)法、长距离预报有地震反射层析成像(TRT)、超前水平钻探、地震反射波法(TSP)等[1-5]。单一的预报方法精准度较差,也无法对开挖面前方围岩和地下水变化情况进行系统地预报[6-7]。本文将科学地运用瞬变电磁仪法与超前水平钻孔法进行地质条件的分析和预测,以改善现状,切实提高地质灾害超前预测水平。
1 工程概况
铜锣山隧道位于四川台拗褶皱带东北部,属新华系的次级沉降带。隧道处于铜锣山背斜北段,主体构造为铜锣山背斜、区域断层(F2)和各种次级褶皱、节理裂隙等。
工程地质概况:
铜锣山隧道位于南充~大竹~梁平(川渝界)高速公路,横穿大竹县余家镇之间铜锣山背斜中背斜灰岩出露区,山体多呈孤立的贝壳状浑圆形山峰;两翼主要为砂、泥岩出露,山体多呈不规则状连成片状的浑圆山体。……