Study on the Development and Change of Rock Fissure under Waterlogged Environment

Junpeng Yang ； Huan Li ； Jialong Yu

《International Core Journal of Engineering》 9卷4期 (2023/04) Pp. 234-239

https://doi.org/10.6919/ICJE.202304_9(4).0032

摘要

The water‐rock interaction has a great influence on the mechanical properties of rock and the degree of fracture development. The difference of acid‐base of water in rock fracture will affect the degree of fracture development, the strength of water‐rock chemical reaction and the weakening of rock mechanical properties. In this paper, thin stratified mudstone collected from the roof of a coal mine is taken as the research object. Dynamic soaking experiments were carried out with three kinds of solutions, pH=5, pH=7 and pH=9, and the change characteristics of mineral particles and the change of rock fissure development were observed under a 500‐fold microscope, and the principle of water‐rock chemical action and the cause of fissure change were analyzed. The following conclusions were obtained: (1) There are three kinds of changes: slow expansion, sudden increase, first expansion and then shrinkage of rock fissure in the immersed environment. (2) Different acid and alkaline aqueous solutions have a great difference in the degree of crack expansion and development, neutral > alkaline > acidic for rock crack expansion.

關鍵字

Mudstone ； Water‐rock Action ； Mineral Composition ； Crack Propagation

參考文獻

D.L. SHANG, Z.H. ZHAO, Z.H. DOU, et al. Shear behaviors of granite fractures immersed in chemical solutions, Engineering Geology, 2020, 279.

X. DONG, Y. WU, K.W. CAO, et al. Analysis of Mudstone Fracture and Precursory Characteristics after Corrosion of Acidic Solution Based on Dissipative Strain Energy, Sustainability, 2021, 13(8).

Y. LIN, K.P. ZHOU, F. Gao, et al. Damage evolution behavior and constitutive model of sandstone subjected to chemical corrosion, Bulletin of Engineering Geology and the Environment, 2019, 78(8).

W. WANG, T.G. LIU, J. LV, et al. Experimental Study of Influence of Water-rock Chemical Interaction on Mechanical Characteristics of Sandstone, Chinese Journal of Rock Mechanics and Engineering, 2012, 31 (S2): 3607-3617.

J.B. YANG, X.T. FENG, P.Z. PAN, et al. Aperture Evolution of Single Fracture in Granite under Triaxial Compressive Stress and Chemical Solution Seepage, 2012, 31(09):1869-1878.