首页|Mechanical behavior and damage constitutive model of sandstone under hydro-mechanical(H-M)coupling

Mechanical behavior and damage constitutive model of sandstone under hydro-mechanical(H-M)coupling

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Underground engineering often passes through water-rich fractured rock masses,which are prone to fracture and instability under the long-term coupling of in-situ stress field and pore water(P-W)pres-sure,ultimately threatening the stability of underground structures.In order to explore the mechanical properties of rocks under H-M coupling,the corresponding damage constitutive(D-C)model has become the focus of attention.Considering the inadequacy of the current research on rock strength parameters,energy evolution characteristics and D-C model under H-M coupling,the mechanical properties of typical sandstone samples are discussed based on laboratory tests.The results show that the variation of char-acteristic stresses of sandstone under H-M coupling conforms to the normalized attenuation equation and Mohr-Coulomb(M-C)criterion.The P-W pressure mechanism of sandstone exhibits a dynamic change from softening effect to H-M fracturing effect.The closure stress is mainly provided by cohesive strength,while the initiation stress,damage stress,and peak stress are jointly dominated by cohesive strength and friction strength.In addition,residual stress is attributed to the friction strength formed by the bite of the fracture surface.Subsequently,the energy evolution characteristics of sandstone under H-M coupling were studied,and it was found that P-W pressure weakened the energy storage capacity and energy dissipation capacity of sandstone,and H-M fracturing was an important factor in reducing its energy storage efficiency.Finally,combined with energy dissipation theory and statistical damage the-ory,two types of D-C models considering P-W pressure are proposed accordingly,and the model param-eters can be determined by four methods.The application results indicate that the proposed and modified D-C models have high reliability,and can characterize the mechanical behavior of sandstone under H-M coupling,overcome the inconvenience of existing D-C models due to excessive mechanical parameters,and can be applied to the full-range stress-strain process.The results are conducive to revealing the deformation and damage mechanisms of rocks under H-M coupling,and can provide theoretical guidance for related engineering problems.

H-M couplingWater-saturated sandstoneMechanical mechanismEnergy evolutionD-C model

Tao Tan、Chunyang Zhang、Yanlin Zhao、Xiaoshuang Li

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School of Resources and Environmental Engineering,Wuhan University of Technology,Wuhan 430070,China

State Key Laboratory of Safety and Health in Metal Mines,Maanshan 243000,China

Sinosteel Maanshan General Institute of Mining Research Co.,Ltd.,Maanshan 243000,China

School of Resource & Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan 411201,China

School of Urban Construction,Changzhou University,Changzhou,Jiangsu 213164,China

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National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaIndependent Innovation Research Fund Graduate Free Exploration Project

Nos.5217408842277154No.104972024JYS0007

2024

10.1016/j.ijmst.2024.07.002

矿业科学技术学报(英文版)
中国矿业大学

矿业科学技术学报(英文版)

CSTPCDEI
影响因子：1.222
ISSN：2095-2686
年,卷(期)：2024.34(6)
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