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分析了地下工程围岩裂隙分布规律 ,即靠近巷道轮廓处的裂隙开度和裂隙密度最大 ,随着与巷道轮廓距离增大 ,其开度和密度逐渐减小。据此研制了一种可变注浆孔内压力的新型注浆器。该注浆器的工作原理为 ,水泥浆液沿注浆孔底部向孔口部流动时 ,其经过注浆器外管上的滤水条缝越多 ,浆液失水亦越多 ,其浓度也越高 ,而其压力则越低 ,从而满足了向孔底部小开度裂隙以较高压力注稀浆 ,向孔口部大开度裂隙以较低压力注浓浆的需要。该注浆器可以使孔口压力降低为孔底的 1 7～ 1 8,从而使注浆孔周围浆液扩散半径在孔口部与孔底部基本均衡。通过模拟试验确定了注浆器的主要参数 ,验证了该注浆器改变注浆孔内浆液压力的有效性。
The distribution of cracks in underground rock is analyzed, that is to say, the crack opening and crevice density near the roadway contour are the largest. With the increase of the distance from the roadway, the opening and density of the crack are gradually reduced. According to this, a new grouting device with variable pressure inside the grouting hole was developed. The working principle of the grouting device is that when the cement slurry flows along the bottom of the grouting hole to the mouth part, the more water straining the grout passes through the grouting pipe, the more water loss the grout will have and the more its concentration will be High, and its pressure is lower, so as to meet the small opening to the bottom of the hole cracks at a higher pressure to note the pulp, the opening to the mouth of a large opening fissure at a lower pressure injection needs. The grouting device can reduce the orifice pressure to 17 to 18 at the bottom of the hole so that the diffusion radius of the slurry around the grouting hole is substantially equalized between the orifice and the bottom of the hole. Through the simulation test, the main parameters of the grouting device were confirmed, and the validity of the grouting device to change the grouting pressure in the grouting hole was verified.