基于线岩溶率的隧道围岩分级方法研究  

Study on Classification Method of Tunnel Surrounding Rock Based on Linear Karst Rate

作　　者：范晓岭[1] 安静 Fan Xiaoling;An Jing(Jiaoke Transport Consultants Ltd.,Beijing,100191,P.R.China;China Construction Industry Association,Beijing,100055,P.R.China)

机构地区：[1]北京交科公路勘察设计研究院有限公司,北京100191 [2]中国建筑业协会,北京100055

出　　处：《地下空间与工程学报》2023年第5期1462-1470,共9页Chinese Journal of Underground Space and Engineering

摘　　要：孤峰平原区作为岩溶地区常见的一种地貌形态,因地形陡峻,一般情况下不具备实施勘察实物工作量的条件。在基于岩石强度、岩体完整性为主要判别指标,以地下水、软弱结构面产状和初试应力状态为修正指标的隧道围岩基本等级分级方法中存在缺乏判定依据。通过对现有勘察数据的分析,以线岩溶率为基础,综合考虑区域岩溶发育情况及孤峰位置的特殊性,建立以线岩溶率、岩溶发育形态和规模、岩溶充填物、地下水径流及溶洞分层特征等为主要计算参数的体岩溶率计算模型,结合体岩溶率同隧道围岩分级的对应关系调查,对隧道围岩进行初步分级,可较好地为设计、施工和建设单位控制工程造价。As a common geomorphic form in karst areas,isolated peak plain area generally does not have the physical workload of investigation due to its steep terrain,so it is impossible to obtain parameters such as uniaxial compression strength of rock,rock mass integrity,groundwater and weak structural plane.The classification of tunnel surrounding rock is mainly based on the rock strength and rock integrity as the main discrimination indicators,and the groundwater,the occurrence of weak structural planes and the initial test stress state as the correction indicators.Due to the lack of corresponding judgment basis,the basic classification of tunnel surrounding rock cannot be carried out,which is mainly based on experience.Through the analysis of the existing survey data,based on the liner karst ratio exposed by the drilling of the bridge construction site near the tunnel,and taking into account the regional karst development and the particularity of the location of the solitary peak,a calculation model of the volume karst ratio is established,and the tunnel surrounding rock is preliminarily classified in combination with volume karst ratio,karst development form and scale,karst filling,groundwater runoff and karst cave stratification characteristics as the main calculation parameters.According to the existing tunnel excavation experience in karst area,the relationship between volume karst ratio and the proportion of tunnel surrounding rock classification is established,which can better control the project cost for the design,construction and construction units.

关 键 词：孤峰平原 线岩溶率 体岩溶率 围岩分级 岩溶发育程度修正系数 

分 类 号：U45[建筑科学—桥梁与隧道工程]