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我处施工的兖州鲍店矿北风井-430米轨道大巷,皮带大巷及炸药库回风巷,局部位于三灰上下的松软泥岩中,三灰上泥岩层厚9米,岩层松软破碎,层、节理发育,且质脆易风化,风化后则成小颗粒状,体积明显增大。三灰下泥岩厚13～16米,除具有三灰上泥岩的特点外,在距三灰底板以下3.7米处,有一层厚0.7～1.3米的膨胀性粘土岩,呈灰白色或深灰色,该层虽然较薄,但极易风化,特别是当岩层揭露,见风遇水后则成软泥状,膨胀特别明显。当锚喷施工完后,
The construction of the Yanzhou Baodian Mine Beifeng -430 meters track lanes, belts and alleys and blasthole return airway, located in the upper and lower parts of the ash gray mudstone, lime mudstone thickness of 9 meters, soft rock crushing , Layer, joint development, and brittle easy to weathering, weathered into small particles, the volume increased significantly. In addition to shale limestone limestone characteristics, at a distance of 3.7 meters below the lime-gray floor, there is a layer of expansive clay rock 0.7 to 1.3 meters thick, gray or dark gray, Although the thin layer, but extremely easy to weathering, especially when the rock exposed, see the wind after the water into a slime, swelling is particularly evident. When the anchor spray construction is completed,