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<p>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.</p>

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

  • 期刊论文

  • 发表日期：

    2025年5月17日

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

摘要

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.