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重庆市合川区磨子岩危岩3个独立危岩W1~W3中,W2危岩方量最大,岩性齐全,选取W2危岩为研究对象,对它的形成过程进行数值模拟。模拟结果表明,随着采空范围的扩大,陡崖内部各点应力应变增大。模型所示开采条件下,陡崖X方向的最大位移达到0.203 6m,最大应力为7.75 MPa,陡崖顶部和采空区上方围岩应力应变变化明显,形成一个临空面附近的应力应变变化集中区;危岩体内部各点应力应变逐渐增大,后部裂缝扩展并贯通成主控结构面,岩体内部各点位移增至7.091×10~(-3)~19.339×10~(-3)m,应力增至为-1.28~1.73 MPa。数值模拟结果对认识该地采矿活动下危岩的变形破坏特性有积极意义。
The W2 dangerous rock is the largest in scale and has the most complete lithology. The W2 dangerous rock is selected as the research object, and its formation process is numerically simulated. The simulation results show that with the expansion of the mining area, the stress and strain at each point inside the cliff increase. Under the mining conditions shown in the model, the maximum displacement in the X direction of the cliff reaches 0.203 6m and the maximum stress is 7.75 MPa. The stress and strain of the surrounding rock at the top of the cliff and the goaf are obviously changed to form a stress and strain change near the free surface The stress and strain at each point in the dangerous rock mass gradually increase, the crack in the rear part expands and penetrates into the main control structure surface, and the displacement of each point in the rock mass increases to 7.091 × 10 -3 to 19.339 × 10 -3 ) m, the stress increased to -1.28 ~ 1.73 MPa. The numerical simulation results have a positive meaning for understanding the deformation and failure characteristics of the rock under the mining activities in this area.