基于岩石矿物光谱原位测试的隧道内蚀变带快速识别方法  

Rapid Identification of Alteration Zone Based on In-situ Spectral Testing of Rock Mineral in Tunnelling

作　　者：林鹏[1] 许广璐 许振浩[1,2] 余腾飞 邵瑞琦 LIN Peng;XU Guanglu;XU Zhenhao;YU Tengfei;SHAO Ruiqi(Geotechnical and Structural Engineering Research Center,Shandong University,Jinan 250061,China;China School of Qilu Transportation,Shandong University,Jinan 250061,China)

机构地区：[1]山东大学岩土与结构工程研究中心,山东济南250061 [2]山东大学齐鲁交通学院,山东济南250061

出　　处：《应用基础与工程科学学报》2021年第5期1093-1107,共15页Journal of Basic Science and Engineering

基　　金：国家自然科学基金优秀青年科学基金项目(52022053);国家自然科学基金青年科学基金项目(52009073);山东省自然科学基金杰出青年科学基金项目(ZR201910270116)。

摘　　要：隧道施工遭遇蚀变带时容易发生塌方、大变形、突水突泥等地质灾害,蚀变带原位快速判识对隧道施工风险控制与灾害防控等具有重要的理论研究意义和工程应用价值.本文基于岩石矿物光谱测试技术提出了一种隧道内蚀变带原位快速判识方法:基于宏观地质特征分析,建立隧址区光谱库;在隧道内进行原位光谱数据采集,采用包络线去除法进行预处理;采用光谱角匹配法(SAM)识别蚀变矿物成分,采用全约束最小二乘法(FCLS)提取蚀变矿物含量信息,并利用所提取的蚀变矿物信息判识蚀变带类型和蚀变程度.方法成功应用于新疆YE工程,有效判识了隧道内绿帘石化和浊沸石化蚀变带.Alteration zones often cause disasters, such as collapse, large deformations, water and mud inrush during tunnel construction.Rapid in-situ identification of alteration zones has an important role in risk control and disaster prevention for theory research and engineering application.A rapid identification of alteration zone was proposed based on in-situ spectral testing of rock mineral in tunnelling.A spectra library for the tunnel site was established based on analysis of macro-geological characteristics.The rock spectrum data was collected in tunnelling and preprocessed by continuum removal.Altered mineral composition was identified by the Spectral Angle Matching(SAM) and altered mineral content information was obtained by the Fully Constrained Least Square(FCLS).The type and degree of alteration zone were identified based on the obtained alteration mineral information.The proposed method was applied in the tunnel of Xinjiang YE project.Two alteration zones of epidote and laumontite were successfully identified, which verifies the feasibility of this method.

关 键 词：隧道 蚀变带 识别方法 岩石矿物 原位测试 光谱分析 

分 类 号：TU42[建筑科学—岩土工程]