基于模糊层次分析法的单线铁路隧道Ⅳ级围岩段全断面法的适用性研究

Study on the Applicability of the Full-Section Method in Class Ⅳ Surrounding Rock Section of Single-Line Railway Tunnel Based on Fuzzy Analytic Hierarchy Process

为探究全断面工法在单线铁路隧道Ⅳ级围岩段的适宜性,依托大瑞铁路老尖山隧道,通过分析Ⅳ级围岩施工方法选择的影响因素,综合考虑现场实用性,选用岩石单轴抗压强度、岩体完整性系数、动态杨氏弹性模量和泊松比4种影响因素,建立Ⅳ级围岩全断面工法适用性评价体系。采用模糊层次分析法,计算得到老尖山隧道Ⅳ级围岩区段全断面工法的适用性综合评价值,确定评价标准为:单线铁路隧道Ⅳ级围岩段若按本文采用的模糊层次分析法计算得到的全断面工法的适用性评价值大于3,则可采用全断面法施工。

In order to investigate the suitability of the full-section method in the Class Ⅳ section of single-line railway tunnels, based on the Lao Jianshan Tunnel of the Dali-Ruili Railway, analyzing the factors influencing the selection of construction methods for Class Ⅳ surrounding rocks and considering the practicality of the site, four influencing factors, namely uniaxial compressive strength, rock integrity coefficient, dynamic Young’s modulus of elasticity and Poisson’s ratio, were selected to establish a system for evaluating the applicability of the full-section method for Class Ⅳ surrounding rocks. Fuzzy hierarchical analysis method was used to calculate the applicability of the full-section method in the Class Ⅳ section of the Lao Jianshan Tunnel, and the evaluation criteria were determined as follows: if the applicability value of the full-section method calculated by the fuzzy hierarchical analysis method is greater than 3, then the full-section method can be used.