Experimental Study on the Mud-Water Inrush Characteristics through Rock Fractures

Abstract

Fractured rock masses, which are widely distributed in the south of China, have an impartible relationship with mud-water inrush. In order to study the change laws of mud viscosity under different moisture content, flow property, and mechanism of mud-water inrush in fractured rock masses, a NDJ-8S rotary viscometer and a simulation model are used to carry out a series of experimental studies. Tests of mud viscosity show that mud viscosity depends on moisture content, and the relationship between viscosity and moisture content was proposed. Based on mud viscosity results, physical model tests' results indicated that the process of mudwater rush can be divided into four stages: that is, the preparation stage of mud-water mixture burst, the seepage period of mudwater mixture inrush, the nonstable period of mud-water mixture outburst, and the stable period of mud-water mixture outburst. e excavation disturbance, high water pressure, and effect of erosion and corrosion of water were identified as key factors which lead to mud-water inrush in fractured rock masses

Investigation into Macro- and Microcrack Propagation Mechanism of Red Sandstone under Different Confining Pressures Using 3D Numerical Simulation and CT Verification

“…In the ore excavation process, the rock mass is subjected to complex loading and unloading stress processes, which leads to the deformation and destruction of the rock mass. The distribution and expansion of its fissures directly affect mining safety, such as underground water inrush and roof failure which are all developed and evolved from cracks and other weak surfaces [8,9]. In underground mining, the development of fissures is one of the major causes leading to the destruction of rock projects [10][11][12].…”

Grouting Treatment of Water and Mud Inrush in Fully Weathered Granite Tunnel: A Case Study

“…Yang et al [40] showed that the essence of water and mud inrush is that when the cohesion of soil decreases gradually with the increase of pore ratio, until the movement of soil particles cannot be restricted, the soil particles and groundwater form mud and flow out. Zhao and Zhang [41] carried out a series of experimental studies using a rotating viscometer and a simulation model. The results showed that the viscosity of mud inburst in the mud did not depend on the particle size but on the moisture content.…”