Numerical Simulation of Mechanical Characteristics of Roadway Surrounding Rock under Dynamic and Static Loading

Abstract

Mechanical characteristics of roadway surrounding rock under different stress wave disturbances are the key to design roadway supporting scheme. In this study, the 2802 transportation roadway in Zhangcun Coal Mine is selected as the engineering background. The distribution of stress, displacement, and plastic zone in surrounding rock under the impact of different stress waves is studied. Results show that the stress and displacement of the roof, floor, and coal walls present fluctuating change with time during the stress wave loading process. With the increase of disturbing intensity of stress wave, the resistance ability for stress wave disturbance of the roof is lower than that of the floor, while the resistance ability of two sides is the same. The volume of plastic zone in roadway surrounding rock was calculated by the self-compiled FISH code. The relationship between the plastic zone volume and the stress wave disturbing intensity in different states is explored. The cubic polynomial relationship between the volume and the disturbing intensity in the state of shear_past and tension_past is obtained. Under the simulated condition, the disturbing intensity of stress wave has the greatest influence on the increase of shear_past volume when it equals 11 MPa. While the disturbing intensity of stress wave has the greatest influence on the increase of tension_past volume, it equals 7 MPa. Meanwhile, the relation between stress wave disturbing intensity and surrounding rock stress and displacement is obtained respectively. The achievements provide a theoretical base for roadway surrounding rock support under dynamic and static loading.

Instability and failure characteristics of surrounding rock of water drenching roadway in thick coal seam

“…It should be noted that pores and joint fissures of various morphologies in the natural coal rock structure were not considered (Wang et al, 2021). The model was assumed to be isotropic and the Moore Coulomb criterion was used in the simulation (Jia et al, 2021). The physical and mechanical parameters of the surrounding rock were fitted into the moisture content relationship curve as exponential functions of y 1 ~y3 .…”

Numerical simulation of roadway deformation and failure under different degrees of dynamic disturbance

“…(1) where σ is the disturbance intensitie, MPa; f is the disturbance frequency, Hz; t is the disturbance time, s. Since the intensity, frequency, and time of dynamic disturbance are difficult to measure under the existing technical conditions, the intensity, frequency, and time values in this paper cover the current literature [39][40][41] , as shown in Table 2.…”

Deformation and Failure Laws of Surrounding Rocks of Coal Roadways under High Dynamic Load and Intelligent Prediction

“…The high dynamic load in coal mines is mainly derived from the mine earthquake phenomenon produced in the mining process [1] and can lead to the sudden instability and destruction of surrounding rock, causing rock bursts on the working face and threatening the safety of mine production. At present, the research on the deformation and failure mechanisms of roadway surrounding rocks under high dynamic load mainly consists of field investigation, theoretical analysis, numerical simulation, and physical model testing [2][3][4][5][6][7][8][9][10][11], among which the numerical simulation method has been widely used. At present, Flac3D/Udec and other software are considered effective tools for simulating the dynamic phenomena of mines under the action of dynamic load [12][13][14][15], which can not only analyze the influences of various factors on the deformation and failure processes of roadway surrounding rocks under high dynamic load in actual constructions [16][17][18][19] but can also simulate the deformation and failure of complex roadways under high dynamic load [20][21][22][23].…”