含结构面深埋隧洞围岩分区破裂机理研究

胡新伟; 杨石扣; 孙宽; 陈冲平; 邓正定

doi:10.20174/j.JUSE.2025.S2.05

地下空间与工程学报 >

2025 , Vol. 21 >Issue S2: 572 - 580

DOI: https://doi.org/10.20174/j.JUSE.2025.S2.05

理论与试验研究

含结构面深埋隧洞围岩分区破裂机理研究

胡新伟 ,
杨石扣 ,
孙宽 ,
陈冲平 ,
邓正定

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1.江西理工大学土木与测绘工程学院,江西赣州 341000;
2.江西理工大学河流源头水生态保护江西省重点实验室,江西赣州 341000;
3.中国十七冶集团设计研究院,安徽马鞍山 243000

胡新伟(2000—),男,江西修水人,硕士,主要从事岩土工程稳定性方面的研究。E-mail: 2919223693@qq.com

杨石扣(1985—),男,江苏东台人,副教授,博士,主要从事水工地下结构工程研究。E-mail: yangshikou@126.com

收稿日期: 2025-01-11

网络出版日期: 2026-01-26

基金资助

国家自然科学基金(51739006, 52368048);江西省自然科学基金(20232BAB203079);江西省教育厅科学技术研究项目(GJJ190500)

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Research on Zonal Disintegration Mechanisms of Surrounding Rock in Deep-Buried Tunnels with Structural Planes

Hu Xinwei ,
Yang Shikou ,
Sun Kuan ,
Chen Chongping ,
Deng Zhengding

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1. School of Civil Engineering and Surveying & Mapping Engineering, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 341000, P. R. China;
2. Jiangxi Province Key Laboratory of Water Ecological Conservation in Headwater Regions, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 341000, P. R. China;
3. China Seventeenth Metallurgical Construction Group Design & Research Institute, Ma'anshan, Anhui 243000, P. R. China

Received date: 2025-01-11

Online published: 2026-01-26

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摘要

岩体内部存在大量的节理、裂隙、断层等不连续结构面,深埋隧洞开挖后,洞周围岩会发生分区破裂,与原结构面的交汇融合会导致隧洞出现大变形、涌水和大规模塌陷等灾害。为探究岩体内结构面对深埋隧洞围岩分区破裂的影响,以锦屏二级引水隧洞为研究背景,基于应变软化模型,建立含结构面隧洞数值模型,研究深埋隧洞开挖后围岩分区破裂形态、破裂带数目、破裂区体积随结构面分布位置、倾角、强弱等的变化规律。结果表明:当结构面位于隧洞两侧时,结构面与隧洞净距越小,围岩破裂程度越大,结构面抑制分区破裂向深部扩展效果越明显;结构面与隧洞相交后,结构面不能够有效抑制分区破裂,但会改变分区破裂形态;围岩分区破裂形态会随结构面倾角变化而发生旋转;结构面强度越小,围岩分区破裂越剧烈,结构面抑制分区破裂向深部扩展效果越明显。研究成果可为深埋隧洞开挖围岩支护结构设计提供理论支撑。

关键词： 深埋隧洞; 围岩; 结构面; 分区破裂; 应变软化

本文引用格式

胡新伟 , 杨石扣 , 孙宽 , 陈冲平 , 邓正定 . 含结构面深埋隧洞围岩分区破裂机理研究[J]. 地下空间与工程学报, 2025 , 21(S2) : 572 -580 . DOI: 10.20174/j.JUSE.2025.S2.05

Abstract

A large number of discontinuous structural planes, such as joints, fissures and faults, are present within the rock mass. After deep-buried tunnel excavation, the surrounding rock may undergo zonal disintegration, and the intersection and coalescence of these excavation-induced fractures with pre-existing planes can trigger serious hazards such as excessive deformation, water inrush, and large-scale collapse. To explore the influence of internal structural plane on the zonal fracturing of deep-buried tunnel surrounding rock, water diversion tunnels of Jinping II hydropower station as the research background, a numerical model of the tunnel containing structural planes was established based on the strain-softening model to study the variation laws of the zonal disintegration morphology, the number of disintegration zones, and the volume of the disintegration zones of the surrounding rock after the excavation of deep-buried tunnel with respect to the distribution position, dip angle, and strength of the structural planes. The results show that: When the structural planes are located on both sides of the tunnel, the smaller the clear distance between the structural planes and the tunnel, the greater the degree of disintegration of the surrounding rock, and the more obvious the effect of the structural planes in inhibiting the deep extension of zonal disintegration; After the structural planes intersect with the tunnel, the structural planes will change the zonal disintegration morphology instead of effectively inhibit zonal disintegration; The zonal disintegration morphology of the surrounding rock will rotate with the change of the dip angle of the structural planes; The smaller the strength of the structural planes, the more intense the zonal disintegration of the surrounding rock, and the more obvious the effect of the structural planes in inhibiting the deep extension of zonal disintegration. The research results can provide theoretical support for the design of the surrounding rock support structure during the excavation of deep-buried tunnel.

Key words： deep-buried tunnel; surrounding rock; structural plane; zonal disintegration; strain softening

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