Study on the division method of the excavation disturbed zone in tunnels based on continuous-discontinuous theory

IF 3.7 2区工程技术 Q3 ENGINEERING, ENVIRONMENTAL

Bulletin of Engineering Geology and the Environment Pub Date : 2025-05-17 DOI:10.1007/s10064-025-04349-1

Jixu Zhang, Xiaodong Fu, Chao Tan, Yongqiang Zhou, Qian Sheng, Chen Xu, Jiaming Wu

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引用次数: 0

Abstract

Tunnel excavation can induce stress redistribution in the surrounding rock, causing cracks to continuously propagate and form an Excavation Disturbed Zone (EDZ). Accurately identifying the EDZ is crucial for assessing the stability of the surrounding rock. Based on the continuous-discontinuous theory, the extent of the EDZ is directly determined from the perspective of crack propagation. Initially, based on the constitutive model of the joint element, a quantitative indicator termed the Crack Propagation Index (CPI) was proposed to represent the degree of crack propagation. The calculation formulas for CPI and Yield CPI were derived, and a standard for dividing the EDZ based on the CPI was established. Furthermore, a precise method for identifying and dividing the EDZ was proposed using the Finite-Discrete Element Method (FDEM). The results indicated that the excavation failure zone in the Mine-by Experiment test tunnel computed using FDEM is in close agreement with the V-shaped failure zone measured from this tunnel in terms of maximum depth, angle and shape. Finally, the model tests were conducted based on actual engineering projects, and the EDZ division method established in this paper was applied to the model tests. The results show that the failure modes of the surrounding rock obtained by the two methods are largely consistent, and the depths of the arch-shaped failure zones are similar. Therefore, the EDZ division method established in this paper can provide a reference for selecting support schemes during excavation.

查看原文本刊更多论文

基于连续-不连续理论的隧道开挖扰动区划分方法研究

隧道开挖会引起围岩应力重新分布，导致裂缝不断扩展，形成开挖扰动区（EDZ）。准确识别电火花区对于评估围岩稳定性至关重要。基于连续-不连续理论，从裂纹扩展的角度直接决定了电火花区范围的大小。首先，在节理单元本构模型的基础上，提出了裂纹扩展指数（CPI）作为表征裂纹扩展程度的定量指标。推导了CPI和Yield CPI的计算公式，并建立了以CPI为基础划分开发区的标准。在此基础上，提出了一种利用有限-离散元法（FDEM）精确识别和划分电火花区的方法。结果表明，利用FDEM计算的试验巷道开挖破坏区与实测的v形破坏区在最大深度、角度和形状上都非常吻合。最后结合实际工程进行模型试验，将本文建立的EDZ划分方法应用于模型试验。结果表明，两种方法得到的围岩破坏模式基本一致，拱状破坏区深度相近。因此，本文建立的EDZ划分方法可为基坑支护方案的选择提供参考。

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

Bulletin of Engineering Geology and the Environment 工程技术-地球科学综合

CiteScore

7.10

自引率

11.90%

发文量

445

审稿时长

4.1 months

期刊介绍： Engineering geology is defined in the statutes of the IAEG as the science devoted to the investigation, study and solution of engineering and environmental problems which may arise as the result of the interaction between geology and the works or activities of man, as well as of the prediction of and development of measures for the prevention or remediation of geological hazards. Engineering geology embraces: • the applications/implications of the geomorphology, structural geology, and hydrogeological conditions of geological formations; • the characterisation of the mineralogical, physico-geomechanical, chemical and hydraulic properties of all earth materials involved in construction, resource recovery and environmental change; • the assessment of the mechanical and hydrological behaviour of soil and rock masses; • the prediction of changes to the above properties with time; • the determination of the parameters to be considered in the stability analysis of engineering works and earth masses.