煤层钻孔抽采是矿井瓦斯防治的有效手段，钻孔的稳定性严重影响瓦斯抽采效果。钻孔施工后，多采用注浆的方式进行封孔，封孔浆液在孔周煤体裂隙中渗透，可对煤体裂隙进行封堵，与煤粘结形成固结体，提高孔周煤体的承载性能，增强钻孔稳定性，提升瓦斯抽采效率。然而，在不同推进速度影响下，孔周煤体承受不同加载速率的采动应力扰动，低强度的固结体易发生变形，难以有效提供孔周煤体支撑力，形成新的裂隙漏气通道，极大影响钻孔抽采效果。为此，本文以自研的缓凝浆液作为封孔材料，从浆液-煤固结体力学性能着手，通过实验室试验、理论分析和数值模拟等方法，分析不同加载速率影响下，缓凝浆液-煤固结体的力学性能和损伤演化规律，建立缓凝浆液-煤固结体的损伤本构方程，对增强固结体抗压强度，改善封孔质量提供了理论依据，对提高钻孔瓦斯抽采效率具有重要的现实意义。论文主要成果如下：

（1）基于不同加载速率下浆液-煤固结体力学特性破坏实验，分析浆液-煤固结体应力应变曲线、抗压强度和表面破坏形式，研究加载速率对浆液-煤固结体宏观力学特性的影响；开展浆液-煤固结体扫描电镜实验，得到浆液-煤固结体的微观结构、孔隙率和分形维数，探究加载速率对浆液-煤固结体的微观力学性能的影响；结合浆液-煤固结体宏微观力学参数，建立浆液-煤固结体宏微观力学构效关系。

（2）为探究加载速率对浆液-煤固结体细观力学特性的影响，利用颗粒流模拟软件，根据实验结果建立数值计算模型，进行浆液-煤固结体加载破坏模拟，分析得到在不同加载速率下浆液-煤固结体细观接触力、力链分布规律和损伤强度的变化与宏观力学参数变化相一致。

（3）通过引入注浆修复变量表征注浆修复作用，进而建立加载速率下损伤变量表达式；基于应变等效理论，建立固结体损伤本构方程，利用实验室测得力学性能对损伤力学模型进行验证，发现力学曲线与实验曲线相吻合。

（4）开展封孔材料加固检测现场试验，采用水泥、聚氨酯和缓凝材料进行封孔，监测封孔后的钻孔瓦斯抽采浓度和压力，发现钻孔瓦斯抽采浓度和压力在3~4 m/d推进速度内逐渐增大，适宜的推进速度为4 m/d。

Drilling and pumping in coal seam is an effective means to prevent and control gas in mine. The stability of drilling seriously affects the effect of gas pumping. After drilling construction, holes are mostly sealed by grouting, and the sealing slurry penetrates into the cracks of coal body around the hole, which can seal the cracks of coal body and bond with coal to form consolidated body, improve the bearing performance of coal body around the hole, enhance the stability of drilling hole and improve the efficiency of gas extraction. However, under the influence of different advancing speeds, the coal around the hole is subjected to the disturbance of mining stress at different loading rates, and the consolidated body with low strength is easy to deform, which is difficult to effectively provide the supporting force around the hole and form a new fissure leakage channel, which greatly affects the drilling and extraction effect. Therefore, in this paper, the self-developed slow-setting grout is used as the sealing material. Starting from the physical properties of the grout-coal consolidation, the mechanical properties and damage evolution law of the slow-setting grout-coal consolidation under the influence of different loading rates are analyzed by means of laboratory tests, theoretical analysis and numerical simulation, and the damage constitutive equation of the slow-setting grout-coal consolidation is established to enhance the compressive strength of the consolidated body. Improving the sealing quality provides a theoretical basis and has important practical significance for improving the efficiency of gas extraction. The main achievements are as follows:

(1) Experiments on mechanical properties of grout-coal consolidation were carried out at different loading rates, and the influence of loading rate on macroscopic mechanical properties of grout-coal consolidation was studied by analyzing the stress-strain curve, compressive strength and surface failure form of grout-coal consolidation. The microstructure, porosity and fractal dimension of grout-coal consolidation were obtained by scanning electron microscopy (SEM) experiments, and the influence of loading rate on the micromechanical properties of grout-coal consolidation was explored. Combined with macro and micro mechanical parameters of grout-coal consolidation body, the structure-activity relationship of grout-coal consolidation body was established.

(2) In order to explore the influence of loading rate on the meso-mechanical properties of grout-coal consolidation, particle flow simulation software was used to establish a numerical calculation model according to the experimental results to simulate the loading failure of grout-coal consolidation. It was analyzed that the changes of meso-contact force, force chain distribution law and damage strength of grout-coal consolidation were consistent with the changes of macroscopic mechanical parameters under different loading rates.

(3) By introducing the grouting repair variable to characterize the grouting repair, the expressions of loading rate and damage variable under the grouting repair were established. Based on the strain equivalent theory, the damage constitutive equation of the consolidated body was established, and the damage mechanical model was verified by the mechanical properties of the laboratory. It was found that the mechanical curve was consistent with the experimental curve.

(4) The field test of sealing materials reinforcement was carried out. Cement, polyurethane and retarding materials were used to seal the holes. The concentration and pressure of gas extraction in the borehole after sealing were monitored.

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