关键词: 厚松散层, 地面注浆, 注浆参数, 压水试验

Abstract: In order to determine the ground high-pressure grouting parameters of deep and thick loose layers, taking the Guotun Coal Mine's industrial square vertical shaft passing through the loose layers as the research object, the borehole water pressure test and the ground high pressure grouting test methods are used, and the ground water permeability and unit are obtained according to the test monitoring data. The relationship between water absorption, depth, and grouting pressure; according to the ratio of grouting pressure to static water and the ratio of pressurized water flow to grouting flow at the injection point of each layer, the size of grouting pressure and grouting volume are determined; finally, wind inspection 3 The hole grouting effect was evaluated. The results show that: (1) The water permeability of the wellbore through deep and loose formations decreases with the increase in thickness, and the unit water absorption of each grouting layer increases approximately linearly with the pressure at the injection point; (2) The high pressure grouting pressure on the surface of the deep and loose formations When the hydrostatic pressure reaches 2.0 to 2.5 times, the cement slurry can be smoothly injected into the stratum to be reinforced; when the pressure water test and the grouting test of each grouting layer are subjected to the same injection point pressure, the grouting flow is half of the pressure water flow; 3) During the surface high-pressure grouting test, the pressure grouting of each layer has little effect on the wellbore. The test results have been successfully applied in the main, auxiliary, and air shaft deflection control surface high-pressure grouting projects, providing a reference basis for determining the ground grouting parameters of the thick loose layer under similar conditions in the future.