Journal Published Online: 10 January 2025
Volume 53, Issue 1

Study of Seepage Characteristics and Statistical Damage Constitutive Model of Calcareous Mudstone under Different Fluid Pressures

CODEN: JTEVAB

Abstract

The ground stress and water pressure together impact the underground water diversion tunnels in plateau regions, which poses a serious threat to the stability of the surrounding rocks and the safety of engineering structures. Typically, the surrounding rock is calcareous mudstone, which is susceptible to weakening by water. This paper presents an experimental study of calcareous mudstone’s mechanical behavior and permeability characteristics under different fluid pressures in a soft rock tunnel of the Central Yunnan Water Diversion Project (CYWDP) in China. The test results show that the fluid pressure affects the calcareous mudstone’s strength and permeability characteristics, leading to its failure and deformation. The fluid pressure promotes the development of internal microcracks, reduces peak stress and damage stress, and influences failure modes. The evolution of permeability with strain is strongly related to the development of microcracks. Based on the statistical damage theory, a rock damage constitutive model considering fluid pressure and porosity is proposed, and experimental data are used to validate its effectiveness. The research results can be used for understanding the mechanical behavior and constitutive model of hydro-mechanical coupling in soft rock underground projects.

Author Information

Xu, Wei
College of Energy and Mining Engineering, Qingdao, China University of Lille, CNRS, Centrale Lille, Lille, France
Qu, Xiao
College of Energy and Mining Engineering, Qingdao, China
Yan, Long
Research Institute of Geotechnical Engineering, Nanjing, China
Ning, Yu
PowerChina Kunming Engineering Corporation Limited, Kunming, China
Pages: 17
Price: $25.00
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Details
Stock #: JTE20230728
ISSN: 0090-3973
DOI: 10.1520/JTE20230728