Effects of Excavation Process and External Disturbance on Fracture Behavior of Rock Around Tunnel: Large-Scale Laboratory Tests

IF 3.2 2区材料科学 Q2 ENGINEERING, MECHANICAL

Fatigue & Fracture of Engineering Materials & Structures Pub Date : 2025-07-17 DOI:10.1111/ffe.70034

Qingxiong Zhao, Kaihui Li, Jiezhen Chen, Ping Cao, Qibin Lin, Xiangyang Zhang

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Abstract

In this study, taking the deep-buried tunnel excavation as the background, the loading path for simulating excavation unloading and external disturbance was determined. A series of biaxial compression tests were conducted on large sandstone specimens containing single or double circular tunnels with different excavation advances. The results show that the stress adjustment required to fracture the surrounding rock gradually decreases as the tunnel's excavation proceeds. The presence of the preceding tunnel reduces the stress adjustment needed for crack initiation in the surrounding rock during the lagging tunnel excavation. In contrast to the lagging tunnel fracture process for twin-tunnel specimens, the V-shaped notched tunnel fracture for single-tunnel specimens starts at the tunnel entrance and gradually moves toward the tunnel face. The twin-tunnel specimen exhibits more concentrated surface strain and more extensive fracture propagation with more shear cracks than the single-tunnel specimen. Additionally, the sudden change in the deformation trend of the surrounding rock indicates the fracture occurrence. The deformation around the tunnel implies that the range of excavation-damaged zone in the surrounding rock is greater than the range of crack propagation.

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开挖过程及外界扰动对隧道围岩破坏行为的影响：大型室内试验

本研究以深埋隧道开挖为背景，确定了模拟开挖卸载和外部扰动的加载路径。对含不同开挖进度的单、双圆形隧道的大型砂岩试件进行了一系列双轴压缩试验。结果表明：随着隧道开挖的进行，破坏围岩所需的应力调整值逐渐减小；超前隧道的存在降低了超前隧道开挖时围岩起裂所需的应力调整。与双隧道试件的滞后隧道断裂过程不同，单隧道试件的v形缺口隧道断裂从隧道入口开始，逐渐向隧道工作面移动。与单隧道试样相比，双隧道试样表现出更集中的表面应变和更广泛的断裂扩展和更多的剪切裂纹。另外，围岩变形趋势的突然变化预示着裂缝的发生。隧道周围的变形表明，围岩开挖破坏区范围大于裂纹扩展范围。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Fatigue & Fracture of Engineering Materials & Structures 工程技术-材料科学：综合

CiteScore

6.30

自引率

18.90%

发文量

256

审稿时长

4 months

期刊介绍： Fatigue & Fracture of Engineering Materials & Structures (FFEMS) encompasses the broad topic of structural integrity which is founded on the mechanics of fatigue and fracture, and is concerned with the reliability and effectiveness of various materials and structural components of any scale or geometry. The editors publish original contributions that will stimulate the intellectual innovation that generates elegant, effective and economic engineering designs. The journal is interdisciplinary and includes papers from scientists and engineers in the fields of materials science, mechanics, physics, chemistry, etc.