玄武岩隧道综合地质勘探经验及问题探讨  

Discussion on Comprehensive Geological Exploration for Basalt Tunnel

作　　者：李坚[1] 杨英[1] 

机构地区：[1]中铁二院工程集团有限责任公司,成都610031

出　　处：《铁道工程学报》2010年第10期1-7,共7页Journal of Railway Engineering Society

摘　　要：研究目的:以大理至丽江铁路禾洛山隧道为例,针对玄武岩差异风化特殊的工程地质性质,对综合地质勘探技术,特别是综合物探技术进行研究,目的是评价该隧道的整体工程地质条件、预测地质风险并指导隧道施工。研究结论:(1)根据物探资料,综合异常形态、视电阻率值及其梯度值大小,可以对低阻异常进行分类。(2)Ⅴ、Ⅳ和Ⅲ类物探异常分别对应Ⅴ级围岩、Ⅳ级围岩和Ⅲ级围岩;但是,开挖资料表明,仅依据物探资料难以区分Ⅳ级和Ⅴ级围岩,存在混判两种围岩级别的问题。(3)由于玄武岩的特殊工程地质条件,必须进行综合地质勘探,特别是进行物探,才能比较客观地评价隧道的工程地质条件,正确地指导施工。Research purposes： In order to evaluate the general engineering geological condition,forecast geological disaster in tunnel construction and instruct the tunnel construction,the study was done on the comprehensive geological exploration technology,especially on the comprehensive geophysical exploration technology for the Heluoshan Tunnel of Dali-Ruili Railway according to the special engineering geological characteristics of basalt like differential weathering.Research conclusions：（1） Based on the data of geophysical exploration,the anomaly of the lower resistivity can be sorted according to the anomaly shape and the value and the gradient of resistivity.（2） The Ⅴ,Ⅳ and Ⅲ anomaly gradations should correspond respectively with the Ⅴ,Ⅳ and Ⅲ surrounding rocks.On the other hand,the data of the tunnel excavation demonstrate that only with the data of the geophysical exploration it is difficult to distinguish Ⅴ surrounding rock and Ⅳ surrounding rock.（3） Due to special engineering geological character of basalt,the comprehensive geological exploration,especially the geophysical exploration must be conducted in order to objectively evaluate the general engineering geological condition for the tunnel and rightly instruct tunnel construction.

关 键 词：综合地质勘探 综合物探 玄武岩 围岩分级 经验及问题 

分 类 号：U452.13[建筑科学—桥梁与隧道工程]