杨石扣, 孙宽, 邓正定,等.深埋多隧洞开挖围岩分区破裂化机制研究[J].河南理工大学学报（自然科学版）,2026,45(4):30-38.

YANG S K, SUN K, DENG Z D, Hu Xinwei,et al.Zonal disintegration mechanism of surrounding rock during excavation of deep-buried multiple tunnels[J].Journal of Henan Polytechnic University(Natural Science) ,2026,45(4):30-38.

深埋多隧洞开挖围岩分区破裂化机制研究

杨石扣, 孙宽, 邓正定, 胡新伟

江西理工大学 土木与测绘工程学院，江西 赣州341000

摘要: 目的 围岩分区破裂研究侧重于单隧洞，实际工程中常见的多隧洞围岩分区破裂化机制尚不清晰，为此开展了深埋多隧洞开挖围岩分区破裂化机制研究。  方法 以锦屏二级引水隧洞为研究背景，基于应变软化模型，建立引水隧洞数值模型，研究深埋多隧洞开挖卸荷后围岩分区破裂形态、破裂带最大径向距离、破裂带数目等随强度参数、变形参数和剪胀角的变化规律，比较强度参数、变形参数、剪胀角对围岩分区破裂形态的影响。 结果 结果表明：多隧洞开挖卸荷后，4个洞室的破裂形态呈一定对称关系，2号隧洞围岩分区破裂迹象更严重，1号隧洞右侧分区破裂程度比左侧的更加剧烈；随着内摩擦角、黏聚力、弹性模量减小或剪胀角增大，围岩分区破裂越剧烈；泊松比主要影响破坏区域位置，泊松比越小，隧洞左右两侧破坏区域逐渐向围岩深处转移，而隧洞拱顶和拱底处的破坏区域逐渐靠近隧洞壁；强度参数对围岩分区破裂形态影响最大，变形参数次之，剪胀角变化对围岩分区破裂影响相对较小。 结论 研究结果揭示了深埋多隧洞开挖卸荷后围岩分区破裂化机制，为深部地下多洞室开挖围岩支护设计提供理论支撑。

关键词:深埋隧洞;围岩;应变软化;分区破裂;强度参数;开挖卸荷

doi:10.16186/j.cnki.1673-9787.2024040037

基金项目:国家自然科学基金资助项目（52368048，51739006）；中国博士后科学基金资助项目（2017M611678）；江西省自然科学基金资助项目（20224BAB213045）；江西省教育厅科学技术研究项目（GJJ190500）；赣州市科技计划项目（赣市科发［2019］60号）

收稿日期:2024/04/20

修回日期:2024/06/24

出版日期:2026/06/17

Zonal disintegration mechanism of surrounding rock during excavation of deep-buried multiple tunnels

Yang Shikou, Sun Kuan, Deng Zhengding, Hu Xinwei

School of Civil Engineering and Surveying & Mapping Engineering， Jiangxi University of Science and Technology， Ganzhou 341000， Jiangxi，  China

Abstract: Objectives Existing studies on zonal fracture of surrounding rock mainly focus on single tunnels， whereas the zonal fracture mechanism of surrounding rock in deep-buried multiple tunnels remains unclear in practical engineering. Therefore， the zonal fracture mechanism of surrounding rock during excavation of deep-buried multiple tunnels was investigated.  Methods Taking the diversion tunnels of the Jinping II Hydropower Station as the engineering background， a numerical model based on the strain-softening constitutive model was established. The variation laws of zonal fracture morphology， maximum radial distance of fracture zones， and number of fracture zones with strength parameters， deformation parameters， and dilation angle after excavation unloading were analyzed. In addition， the influences of these parameters on the zonal fracture characteristics of surrounding rock were compared. Results The results show that the fracture patterns around the four tunnels exhibit a certain symmetrical distribution after excavation unloading. More severe zonal fracture phenomena occur in the surrounding rock of Tunnel No. 2， and the zonal fracture on the right side of Tunnel No. 1 is more significant than that on the left side. With decreasing internal friction angle， cohesion， and elastic modulus， or increasing dilation angle， the zonal fracture becomes more pronounced. Poisson's ratio mainly affects the locations of fractured zones. As Poisson's ratio decreases， the fractured zones on both sides of the tunnel gradually migrate deeper into the surrounding rock， whereas the fractured zones near the crown and invert move closer to the tunnel wall. Among all parameters， the strength parameters have the greatest influence on the zonal fracture morphology， followed by the deformation parameters， while the effect of dilation angle is relatively small.  Conclusions The study reveals the zonal fracture mechanism of surrounding rock after excavation unloading of deep-buried multiple tunnels and provides theoretical support for surrounding rock support design in deep underground multi-cavern excavation engineering.

Key words:deep-buried tunnel;surrounding rock;strain softening;zonal fracture;strength parameters;excavation unloading