Numerical simulation study on mechanical properties of rock like specimen with cracks under the coupling of loading and unloading and osmotic pressure

• Autorzy: Xiong, Liangxiao , Chen, Haijun , Xu, Zhongyuan , Hu, Deye
• Języki publikacji: EN

Abstrakty

EN

The saturated metasandstone is taken as the research object, and the uniaxial compression characteristics of the saturated metasandstone are simulated by means of the artificially made saturated sandstone samples. By checking the parameters of the Particle Flow Code (PFC) numerical simulation of loading and unloading seepage stress coupling, the effects of the conductivity coefficient, the pipe diameter, the apparent volume of the domain and the time step on the calculation results are analyzed. When PFC is used for numerical simulation of seepage stress coupling, the conductivity coefficient K can be taken as 0.010. When the pipe diameter is 1.0 mm, the apparent volume of the current domain is 1 x 10-6 m3, the water pressure distribution inside the sample is relatively uniform. The influence of time step on the compressive strength and peak strain of the specimen can be almost ignored. Under the action of water pressure, the compressive strength of the intact rock like sample and the rock like sample with cracks decreases, and the compressive strength of the sample decreases gradually with the increase of water pressure. When the inclined angle of fracture is the same, the seepage pressure is the same, and the confining pressure is the same, the compressive strength of the specimen also increases with the increase of the initial axial stress level during unloading. When the confining pressure and the osmotic pressure are the same, the unloading effect makes the crack development of the specimen faster and more complete, the specimen is more fragmented and multiple parallel shear bands develop.

Słowa kluczowe

PL

okaz przypominający skałę; przesiąkanie; sprzęganie naprężeń; wytrzymałość na ściskanie

EN

rock like specimen; seepage; stress coupling; compressive strength

• Czasopismo: Archives of Civil Engineering
• Rocznik: 2024
• Tom: Vol. 70, nr 3
• Strony: 297--312
• Opis fizyczny: Bibliogr. 10 poz., il., tab.

Twórcy

autor

Xiong, Liangxiao

• School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang, China,

autor

Chen, Haijun

• Geotechnical Engineering Department, Nanjing Hydraulic Research Institute, Nanjing, China,

autor

Xu, Zhongyuan

• Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu, China,

autor

Hu, Deye

• School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang, China,

Bibliografia

• [1] P. Besuelle, G. Viggiani, J. Desrues, et al., “A laboratory experimental study of the hydromechanical behavior of boom clay”, Rock Mechanics and Rock Engineering, vol. 47, pp. 143-155, 2014, doi: 10.1007/s00603-013-0421-8.
• [2] C.L. Zhang and T. Rothfuchs, “Experimental study of the hydro-mechanical behaviour of the Callovo-Oxfordian argillite”, Applied Clay Science, vol. 26, no. 1-4, pp. 325-336, 2004, doi: 10.1016/j.clay.2003.12.025.
• [3] D.S. Yang, S. Chanchole, P. Valli, et al., “Study of the anisotropic properties of argillite under moisture and mechanical loads”, Rock Mechanics and Rock Engineering, vol. 46, no. 2, pp. 247-257, 2013, doi: 10.1007/s00603-012-0267-5.
• [4] J. Yu, X. Chen, Y.Y. Cai, et al., “Triaxial test research on mechanical properties and permeability of sandstone with a single joint filled with gypsum”, KSCE Journal of Civil Engineering, vol. 20, pp. 2243-2252, 2016, doi: 10.1007/s12205-015-1663-7.
• [5] Z.X. Ning, Y.G. Xue, Z.Q. Li, et al., “Damage characteristics of granite under hydraulic and cyclic loading-unloading coupling condition”, Rock Mechanics and Rock Engineering, vol. 55, pp. 1393-1410, 2020, doi: 10.1007/s00603-021-02698-3.
• [6] S.L. Liu, Q.Z. Zhu, and J.F. Shao, “Deformation and mechanical properties of rock: effect of hydromechanical coupling under unloading conditions”, Bulletin of Engineering Geology and the Environment, vol. 79, pp. 5517-5534, 2020, doi: 10.1007/s10064-020-01824-9.
• [7] X. Chen, C.A. Tang, J. YU, et al., “Experimental investigation on deformation characteristics and permeability evolution of rock under confining pressure unloading conditions”, Journal of Central South University, vol. 25, pp. 1987-2001, 2018, doi: 10.1007/s11771-018-3889-2.
• [8] C. Zhang and L. Zhang, “Permeability characteristics of broken coal and rock under cyclic loading and unloading”, Natural Resources Research, vol. 28, pp. 1055-1069, 2019, doi: 10.1007/s11053-018-9436-x.
• [9] F.D. Zhang, “Research on rock permeability and failure characteristics under different loading and unloading paths”, Acta Geophysica, vol. 70, no. 3, pp. 1363-1371, 2022, doi: 10.1007/s11600-022-00788-6.
• [10] X.R. Liu, J. Liu, D.L. Li, et al., “Unloading mechanical properties and constitutive model of sandstone under different pore pressures and initial unloading levels”, Journal of China Coal Society, vol. 42, no. 10, pp. 2592-2600, 2017 (in Chinese).

Identyfikatory

DOI

10.24425/ace.2024.150984