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通过对比、理论和数值模拟分析了大气压力对地下工程稳定性的积极维护作用.结果表明:锚喷的支护抗力与大气压力的数值接近,数值均约为0.1~0.2 MPa,大气压力的存在,使支护抗力增加了近1倍;在典型的地下工程模型上施加大气压力,会使围岩中非弹性变形区的尺寸变小,提高围岩稳定性;对于矩形锚杆支护巷道,大气压力能引起顶板围岩应力变化,使顶板下沉位移明显减小.
The positive maintenance effect of atmospheric pressure on the stability of underground engineering is analyzed by comparison, theory and numerical simulation. The results show that the support resistance of anchor spray is close to that of atmospheric pressure, and the values are about 0.1-0.2 MPa. The existence of atmospheric pressure , So that the support resistance increased by nearly 1 times; in the typical underground engineering model to exert atmospheric pressure, the surrounding rock will make the size of the inelastic deformation zone to improve the stability of surrounding rock; for rectangular bolt supporting roadway, Atmospheric pressure can cause roof rock stress changes, the roof sinking displacement was significantly reduced.