主動支護體系效用性研究

——以天天高速大路山隧道為例

打開文本圖片集

關鍵詞：主動支護；被動支護；圍巖；數(shù)值模擬

中圖分類號：U455.7 文獻標志碼：A 文章編號：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，一大批重點交通基礎設施正在修建或即將建設，在皖南山區(qū)與大別山山區(qū)出現(xiàn)了大量穿越復雜地質環(huán)境條件下的長大山嶺隧道，由此帶來的隧道工程支護需求與災害防治問題也日益突出。（剩余5758字）