顺层瓦斯抽采钻孔和防冲卸压钻孔(双防钻孔)的协同布置，是深部矿井防治高瓦斯与冲击倾向性复合灾害的重要措施。由于巷道与双防钻孔施工后的应力重新分布，在双防钻孔密封段处形成的复杂裂隙结构会成为气体渗流通道，这是造成瓦斯抽采浓度过低的主要原因，严重影响煤矿安全生产。因此，为研究顺层双防钻孔密封段煤体裂隙演化及注浆抑制机制，提高双防钻孔条件下的煤层瓦斯抽采效率，本文采用理论分析、实验室试验、数值模拟和现场工业性测试相结合的方法，建立了双防钻孔密封段煤体应力分布物理和力学模型，分析了双防钻孔密封段煤体裂隙演化规律，研究了注浆前后煤体渗透特征，揭示了顺层双防钻孔密封段煤体注浆抑制机制。主要研究工作如下：

(1) 根据顺层双防钻孔的布置结构和受力情况，分析双防钻孔密封段煤体结构分区的演化规律，建立双防钻孔孔周煤体结构物理模型。基于非均匀应力场条件，建立双防钻孔孔周力学模型，给出双孔结构下孔周煤体“三区”的应力、应变和位移的解析解。采用Schwarz交替法理论推导并建立下双防钻孔“双圆孔”应力模型，结合孔周“三区”特征给出了确定双防钻孔最优布置间距的理论方法，并通过工程实例进行求解，得到双防钻孔的最优间距为1.5m。

(2) 采用煤岩体变形破坏数字图像观测实验平台，开展了含双孔煤样变形破坏试验，分析了含孔煤样的力学特性和变形破坏特征，计算试样破坏过程的表面应变场、裂隙张开与错动情况、裂隙区域应变能密度等参数，定量化分析不同孔间距条件下双孔煤样的应变场演化特征和裂隙演化特征，探究不同应力-应变状态下钻孔变形与孔周煤体渗透通道的扩展规律。

(3) 综合考虑顺层双防钻孔密封段煤体应力分布特征和裂隙演化规律，分析了密封段煤体渗流通道分布特征及气体流动特征；开展了双防钻孔密封段孔隙-裂隙“双重孔径”组合煤样三轴渗透试验，分析了煤体渗透率变化规律，试验测得气体漏气量与密封段内煤体的渗透率呈正相关，当密封段煤体渗透率低于1.6×10^-11m²时，空气漏气量小于0.3L/min，进而探究了煤体渗透率与裂隙漏气量的关系。

(4) 采用缓凝注浆材料，开展了裂隙-孔隙“双重孔径”组合煤样注浆-渗透试验，分析了不同注浆压力下煤体孔隙率、渗透率变化规律，注浆后煤体孔隙率下降91.7%~93.59%，渗透率下降99%左右。通过分析双防钻孔密封段煤体破坏和空气渗流过程，以及浆液固结对煤体渗透性的影响，揭示了双防钻孔密封段煤体注浆抑制机制。进一步开展双防钻孔注浆抑制现场考察试验，在陕西某矿1012012工作面，综合采用SF₆示踪法和漏气衰减测试法，验证了缓凝注浆材料对双防钻孔密封段煤体渗透的抑制效果。

通过以上研究，从理论上构建了非均匀应力场条件下双防钻孔“双圆孔”应力模型，分析了双防钻孔变形和裂隙演化规律，研究了注浆前后煤体渗透特征，揭示了顺层双防钻孔密封段煤体注浆抑制机制。研究结果丰富了高瓦斯与冲击地压复合灾害矿井协同防治理论，对提高煤层瓦斯抽采效果提供了理论依据，具有重要的现实意义。

The cooperative arrangement of gas extraction boreholes and pressure relief boreholes (double-prevention boreholes) is an important measure to control the compound disaster of high gas and outburst proneness in deep mines. Due to the stress redistribution after the construction of roadway and double-prevention boreholes, the complex crack structure formed around the sealing section of double-prevention boreholes becomes the channel for air seepage, which is the main reason for the low concentration of gas extraction, and seriously affects the safety production of coal mines. To study the mechanism of inhibiting crack evolution by grouting around the sealing section of double-prevention bedding boreholes, and to improve the efficiency of gas extraction under the condition of double-prevention bedding boreholes. The combination of theoretical analysis, laboratory experiments, numerical simulation, and on-site industrial tests is used to establish a physical and mechanical model of coal body stress distribution around the sealing section of double-prevention borehole. The crack evolution law of coal body is analyzed, the permeability characteristics of coal body before and after grouting are studied, and the grouting inhibition mechanism of coal body around the sealing section of double-prevention borehole is revealed. The main research works are as follows:

(1) Based on the structural arrangement and stress conditions of double-prevention bedding boreholes, the structure zones evolution law of the coal body in the sealing sections were analyzed, and a physical model of the coal body structure around the boreholes was established. Based on the conditions of non-uniform stress field, the mechanical model of double-prevention boreholes was established, and the analytical solutions of stress, strain, and displacement in the “three zones” around the boreholes were given. The Schwarz alternating method was used to derive and establish the “dual-circular borehole” mechanical model under double-prevention boreholes conditions. The theoretical method for determining the optimal spacing between double-prevention boreholes was proposed by combining with the characteristics of “three zones” around the boreholes, and the optimal spacing of the double-prevention boreholes was obtained as 1.5m by solving the engineering examples.

(2) The digital image observation experimental platform for deformation and failure of coal and rock bodies was used to carry out the deformation and failure test of coal samples with double boreholes. The mechanical and deformation failure characteristics of samples are analyzed, and the parameters of surface strain field, crack opening and shearing, and strain energy density in the crack area were calculated of the samples during the failure. The evolution characteristics of the strain field and the crack of the coal samples with double boreholes under the different borehole spacing were quantitatively analyzed, and the propagation laws of the borehole deformation and the permeable channels of the coal body around the double-boreholes under different stress-strain states were explored.

(3) Considering the stress distribution characteristics and crack evolution law of the coal body in the sealing section of double-prevention bedding boreholes, the distribution characteristics of the leakage channels and air flow characteristics of the coal body in the sealing section were analyzed. The triaxial permeability test of coal samples with pores-crack “double pore size” combination in the sealing section of double-prevention boreholes was carried out to analyze the change law of coal permeability. The air leakage is positively correlated with the permeability of coal in the sealing section, when the permeability of coal in the sealing section is less than 1.6×10^-11m², the air leakage is less than 0.3L/min, and then the relationship between the coal permeability and crack leakage was explored.

(4) The retardation grouting material was used to carry out the grouting-permeability test of coal samples with pores-crack “double pore size” combination, and the change law of coal porosity and permeability under different grouting pressures was analyzed. After grouting, the porosity of coal decreased by 91.7%-93.59%, and the permeability decreased by about 99%. By analyzing the process of coal body failure and air seepage in the sealing section of double-prevention borehole, and the effect of slurry consolidation on the permeability of coal body, the mechanism of grouting inhibition of coal body in the sealing section of double-prevention borehole was revealed. In the 1012012 working face of a mine in Shaanxi Province, the field investigation test of grouting inhibition of double-prevention boreholes was further carried out. The SF₆ tracer method and the air leakage attenuation test method were comprehensively used to verify the inhibition effect of retardation grouting material on coal permeability in the sealing section of double-prevention boreholes.

Through the above research, the “dual-circular borehole” mechanical model of double-prevention boreholes under conditions of non-uniform stress field was theoretically constructed, the deformation and crack evolution law of double-prevention boreholes were analyzed. The permeability characteristics before and after grouting were studied, and the grouting inhibition mechanisms of coal body in the sealing sections of double-prevention boreholes. The research results enrich the theory of coordinated prevention and control of high gas and rock burst compound disaster mines, and provide a theoretical basis for improving the effect of coal seam gas extraction, which has important practical significance.

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