深部围岩分区破裂化模型试验研究

为研究深部巷道围岩破裂机理,在"深部巷道围岩破裂机理与支护技术模拟试验装置"进行了模型试验,系统研究了深部巷道围岩在最大初始开洞荷载与洞室轴线平行作用下直墙拱顶试验的破坏形态和机理。模型试验表明:当最大主应力与洞室轴线平行,在较大轴向压力作用下产生较大的朝洞内的膨胀变形,使得在围岩内产生较大的径向拉应变,其产生的拉伸断裂是出现分层破坏现象的关键,分布特点是随着轴向应力的增加其拉应变值增加,随距洞壁距离的增大其拉应变值减小。拉伸断裂面形成后,相当于在原来的介质内又形成了一个新的半径增大的洞室,洞室在较大的轴向压应力持续作用下,拉伸破坏过程不断重复出现,就会形成交替的破裂区域和未破裂区域,即分层破裂现象。

Model test research on the zonal disintegration in deep rock

The “capacity of deep rock breakage mechanics and supporting technique model test” was used to research the mechanism of zone disintegration within surrounding rock of mine in deep stratum，and the failure state and principle of the uprightwall-crown section mine bearing maximum load that paralleling the mine axis line was systematically studied.The model test results show that the major radial tension strain following tension breakage in country rock is the key factor of generation of zonal disintegration around mine when the country rock is in dilatancy state，and the distribution characteristic of radial tension strain is that the stain value is increasing with the axial load raising and is decreasing with the distance from mine wall increasing.A new equivalent radius enlarged mine is emerged after the tension breakage face is formed，and in the persistence major axial load state，the broken zone and unbroken zone that is zone disintegration can be generated in country mine rock with the tension breakage appearing interactively.