CSAMT深埋长大隧道破碎岩体靶向勘察研究  

Research on Targeted Survey of Fractured Rock Mass in Deep and Long Tunnels Using CSAMT

作　　者：尹小康[1] 罗威 赵思为[1,2] 王仕兴[1] 杨开明[2] YIN Xiaokang;LUO Wei;ZHAO Siwei;WANG Shixing;YANG Kaiming(Geological Survey and Geotechnical Engineering Design and Research Institute,China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu Sichuan 610031,China;Chengdu University of Technology,Chengdu Sichuan 610059,China)

机构地区：[1]中铁二院工程集团有限责任公司地勘岩土工程设计研究院,四川成都610031 [2]成都理工大学,四川成都610059

出　　处：《中国铁路》2024年第6期57-67,共11页China Railway

基　　金：中铁二院工程集团有限责任公司科技研究开发计划项目(KDNQ203001)。

摘　　要：铁路深埋长大隧道因其埋深大、里程长,同时伴随复杂多变的地质问题,致使地质勘察难以查明、查细,特别是对深埋长大隧道破碎岩体空间分布的精准定位一直是工程勘察中的难题。基于CSAMT三维正反演理论,研究建立了针对深埋长大隧道中破碎岩体靶向勘察模式,从而实现“点-线-面”的精准勘察。通过开展基于四面体网格的CSAMT三维正演和有限内存拟牛顿法的三维反演研究,以及二、三维模型分析对比,验证三维CSAMT在铁路隧道勘察中的优势。在滇西地区某深埋长大隧道TBM掘进工区开展三维“点-线-面”靶向勘察试验,结果表明该勘察体系可靠且精度高,精准探明了TBM卡机工区段前方的花岗岩蚀变带影响范围及其空间展布形态,确定了断层破碎带的影响范围及其空间展布形态,有效提高深埋长大隧道勘察精度。布置靶向测线从“点-线-面”进行三维CSAMT勘察这一思路,对深埋长大隧道的勘察工作提供一定的应用参考价值。Due to the large depth,extended length,and complicated and varying geological conditions of deep and long railway tunnels,it is difficult to achieve a clear and detailed geological survey.In particular,the precise location of the spatial distribution of fractured rock mass in deep and long tunnels always remains a challenge in engineering surveys.Based on the CSAMT 3D forward modeling and inversion theory,a targeted survey approach for fractured rock mass in deep and long tunnels was established to achieve precise“point-line-plane”surveys.The study verified the benefits of utilizing 3D CSAMT for railway tunnel surveys by conducting research on CSAMT 3D forward modeling based on tetrahedral mesh and 3D inversion employing the limited-memory quasi-Newton method,as well as analyses and comparisons between 2D and 3D models.A 3D“point-line-plane”targeted survey test was carried out in the TBM tunneling work area of a deep and long tunnel in western Yunnan.The results show that this survey system is reliable and can achieve high precision.It ascertained the influence range and spatial distribution pattern of the granite alteration zone in front of the work area where the TBM was stuck and determined the influence range and spatial distribution pattern of the fractured fault zone,thereby effectively improving the survey precision of the deep and long tunnel.The concept of arranging targeted survey lines to carry out 3D CSAMT“point-line-plane”surveys provides practical significance for surveys of deep and long tunnels.

关 键 词：CSAMT 深埋长大隧道 破碎岩体 靶向勘察体系 

分 类 号：U452[建筑科学—桥梁与隧道工程]