主动支护体系效用性研究

——以天天高速大路山隧道为例

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关键词：主动支护；被动支护；围岩；数值模拟

中图分类号：U455.7 文献标志码：A 文章编号：1003-5168（2025）08-0063-06

DOI： 10.19968/j.cnki.hnkj.1003-5168.2025.08.011

Abstract： [Purposes] With the guiding principle of "active support" that fully "enhances and mobilizes "the self-bearing capacity of rock mass，this study aims to investigate the efectiveness of an active support system based on prestressed anchorage system.[Methods] This article adopts numerical simulation method to evaluate the effectiveness and superiority of active support by comparing and analyzing the deformation and stress characteristics of the support structure and surrounding rock under active and passive support in the engineering test section.[Findings] The change from passive support to active support reduces rock deformation around the tunnel by 3 2 . 2 % ， rock stress state by 3 9 . 8 % ， the number of plastic zone elements by 2 8 % ，and the maximum principal tensile stress value by 2 4 . 8 % .[Conclusions] Active support can effectively reduce the tensile stress around the tunnel，thereby suppressing the expansion and penetration of cracks and the formation of macroscopic fracture surfaces，and improving the mechanical properties of the rock mass after tunnel excavation; the distribution area of principal compressive stress under active support extends and penetrates from the shallow part of the surrounding rock to the deep part of the surrounding rock，eectively mobilizing the bearing capacity of the deep surrounding rock，expanding the main bearing area of the surrounding rock，and thereby achieving coordination and optimization of the stress states of the deep and shallow surrounding rocks;active support can improve the distribution of plastic zones in the surrounding rock of the support area，optimize the stress state of the support structure，ensure the safety and reliability of the initial support structure，and retain a large safety margin.

Keywords： active support; passive support; surrounding rock; numerical simulation

0 引言

目前，一大批重点交通基础设施正在修建或即将建设，在皖南山区与大别山山区出现了大量穿越复杂地质环境条件下的长大山岭隧道，由此带来的隧道工程支护需求与灾害防治问题也日益突出。（剩余5758字）