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根据南水北调中线工程某采空区充填注浆对比试验,优化了工程注浆处理参数,选定较优的注浆材料、孔排距、注浆压力、结束标准等。根据钻孔弹性波CT速度成像剖面,结合钻孔情况、注浆情况综合判断采空区注浆处理效果,结果表明:孔排距为18 m×18 m情况下,水固比为1∶1的大掺量粉煤灰水泥浆液本身流动性较好;当孔口压力为1.0～1.5MPa,泵量小于10 L/min,并稳定10 min,即可结束灌浆施工。通过综合判断,该注浆处理方法能达到预期的充填效果。
According to the comparative test of filling and grouting in a gob of the midline of the South-to-North Water Diversion Project, the grouting parameters of the project are optimized, the optimal grouting materials, hole row spacing, grouting pressure and end standard are selected. According to the borehole elastic wave CT velocity imaging profile, combined with the drilling conditions and grouting conditions, the effect of gob processing is judged synthetically. The results show that the water-solid ratio is 1: 1 when the row spacing is 18 m × 18 m Of high volume fly ash cement slurry itself better fluidity; when the orifice pressure of 1.0 ~ 1.5MPa, the pump is less than 10L / min, and stable 10min, you can end the grouting construction. Through comprehensive judgment, the grouting method can achieve the expected filling effect.