Research on structural characteristics and hydrodynamic variation properties of argillaceous cemented rocks

ZHANG Teng; ZHANG Zhenbin; WANG Chuanchen; WANG Wenhua

doi:10.19956/j.cnki.ncist.2025.06.007

Abstract：The deformation and instability of argillaceous cemented surrounding rock restrict the safe and effi-cient mining of coal mines.This paper takes Xiaoyun Coal Mine as the research object.Through methods such as indoor experiments,X-ray diffraction,numerical simulation and classification evaluation,the structural characteristics and hydrodynamic variation attributes of argillaceous cemented rocks are revealed.The research results show that through X-ray diffraction analysis,it is found that the clay mineral content of the argillaceous cemented rock is relatively high,mainly consisting of kaolinite,illite/mongolite mixed layer and illite,which have significant expansibility and softening characteristics upon contact with water.Numerical simulation shows that an increase in clay mineral content will reduce the strong cementation between clastic particles and in-crease the weak cementation between clay particles,thereby weakening the mechanical properties of the rock mass.Under immersion conditions,the disintegration process of argillaceous cemented rocks is divided into three stages:rapid argillization,fracture propagation and complete disintegration.The expansion stress increa-ses exponentially with the immersion time,but the mechanical properties gradually decline.Based on the AHP classification evaluation,the degree of hydration of argilified cemented rocks is classified into primitive un-hydrated,moderately hydrated and strongly hydrated according to the comprehensive index Qy of hydration de-gree.The research conclusion provides a theoretical basis for the support design and disaster prevention and control of argillaceous cemented rocks.