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Study on seepage characteristics and stress sensitivity of sandstone under cyclic water intrusion based on CT scanning technique

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Abstract

The cyclic water intrusion and stresses lead to changes in the rock pores' microstructure, which affects the rock’s seepage characteristics. This study performs a three-dimensional reconstruction of the rock specimen using the Avizo software based on the results of multiple computed tomography (CT) tests conducted on sandstone subjected to varying numbers of cyclic water intrusions. In addition, a numerical model comprising pores and grain matrix is developed, based on which stress loading and seepage simulations are carried out. The results show that the mean outlet velocity, maximum seepage pressure, and permeability of the rock samples show an exponential increase with the number of cyclic water intrusions. Stress loading of the rock samples reveals that as the stress increases, the average exit velocity and permeability decrease. It is observed that the stress sensitivity index tends to increase and subsequently decrease with the number of water intrusion cycles at the same stress level when the stress sensitivity index is calculated under different water intrusion cycles. The relationship between effective stress, porosity, and stress sensitivity index is derived, and an effective linkage between permeability and macro-mechanical parameters considering stress sensitivity is achieved.

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Funding

This study was supported by the National Natural Science Foundation of China[Grant Number 51909149) and Shandong Key Laboratory of Civil Engineering Disaster Prevention and Mitigation[Grant Number CDPM2019ZR10].

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Authors and Affiliations

  1. College of Civil Engineering and Architecture, Shandong University of Science and Technology, No.579 Qianwangang Road, Huangdao District, Qingdao City, 266590, China

    Zhe Qin, Wenlong Pang, Weizheng Mao, Jihuan Han, Zhiwen Li & Yujing Yao

  2. Shandong Key Laboratory of Civil Engineering Disaster Prevention and Mitigation, Shandong University of Science and Technology, Qingdao, 266590, China

    Zhe Qin, Wenlong Pang, Weizheng Mao, Jihuan Han, Zhiwen Li & Yujing Yao

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  1. Zhe Qin
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  2. Wenlong Pang
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  3. Weizheng Mao
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  4. Jihuan Han
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  5. Zhiwen Li
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Correspondence to Jihuan Han.

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Qin, Z., Pang, W., Mao, W. et al. Study on seepage characteristics and stress sensitivity of sandstone under cyclic water intrusion based on CT scanning technique. Bull Eng Geol Environ 82, 271 (2023). https://doi.org/10.1007/s10064-023-03308-y

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  • DOI: https://doi.org/10.1007/s10064-023-03308-y

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