Application of excavation compensation method for enhancing stability and efficiency in shallow large-span rock tunnels  

开挖补偿法在提升浅埋大跨度硬岩隧道稳定性与施工效率方面的应用研究

作　　者：BIAN Wen-hui YANG Jun ZHU Chun WANG Ke-xue XU Dong-ming 边文辉;杨军;朱淳;王科学;徐东明(School of Mechanics and Civil Engineering,China University of Mining and Technology,Beijing 100083,China;State Key Laboratory for Tunnel Engineering,Beijing 100083,China;School of Earth Sciences and Engineering,Hohai University,Nanjing 210098,China)

机构地区：[1]School of Mechanics and Civil Engineering,China University of Mining and Technology,Beijing 100083,China [2]State Key Laboratory for Tunnel Engineering,Beijing 100083,China [3]School of Earth Sciences and Engineering,Hohai University,Nanjing 210098,China

出　　处：《Journal of Central South University》2024年第9期3242-3263,共22页中南大学学报（英文版）

基　　金：Projects(42377148,51674265)supported by the National Natural Science Foundation of China;Project(2018YFC0603705)supported by the National Key Research and Development Program of China。

摘　　要：Engineering shallow,large-span rock tunnels challenges deformation control and escalates construction costs.This study investigates the excavation compensation method(ECM)and its associated technologies to address these issues.Utilizing five key technologies,the ECM effectively modulates radial stress post-excavation,redistributes stress in the surrounding rock,and eliminates tensile stress at the excavation face.Pre-tensioning measures further enhance the rock’s residual strength,establishing a new stability equilibrium.Field tests corroborate the method’s effectiveness,demonstrating a crown settlement reduction of 3–8 mm,a nearly 50%decrease compared to conventional construction approaches.Additionally,material consumption and construction duration were reduced by approximately 30%–35%and 1.75 months per 100 m,respectively.Thus,the ECM represents a significant innovation in enhancing the stability and construction efficiency of large-span rock tunnels,marking a novel contribution to the engineering field.浅埋大跨度硬岩隧道工程在控制变形和降低施工成本方面面临着诸多挑战,本研究采用开挖补偿法及其相关技术来应对这些问题。文章系统阐述了开挖补偿法的理论框架,并介绍了五项自主研发的配套关键技术,得到的主要结论有:开挖补偿法可有效调节开挖后的径向应力,重新分配围岩中的应力,并消除了开挖面区域的拉应力。预张拉措施进一步增强了岩石的残余强度,实现了围岩新的稳定平衡。现场测试验证了这种方法的有效性,显示拱顶沉降量减少了3~8 mm,与传统施工设计方法相比,减少了近50%。此外,材料用量减少了约30%~35%,每100 m的施工时间缩短了1.75个月。开挖补偿法为提高大跨度岩石隧道的稳定性及施工效率提供了一种有效且可靠的策略。

关 键 词：excavation compensation method rocky tunnels shallow spanning tunnels tunnel support field test 

分 类 号：U451[建筑科学—桥梁与隧道工程] U455[交通运输工程—道路与铁道工程]