煤矿深部巷道围岩协同控制理论与成套技术

Theory and complete technology for collaborative control of surrounding rock in deep coal mine roadways

  • 摘要: 我国深部煤炭资源丰富,随着浅部煤炭资源不断枯竭,深部煤炭开采势在必行。我国煤矿已有40余对矿井开采深度达到和超过1 000 m,最深达1 510 m,主要分布在中东部和东北矿区。此外,西部一些矿区,如鄂尔多斯、陇东、彬长等矿区也相继进入深部开采。与中浅部矿井相比,深部矿井具有高地应力、强采动、大变形(软岩)及强冲击(硬岩)等显著特点,巷道围岩变形表现为强扩容性、强流变性和冲击破坏严重。深入分析了深部巷道应力环境、围岩地质力学特性,研究了深部软岩巷道围岩变形破坏特征,发现深部软岩巷道围岩大变形主要由3种变形引起:扩容变形、煤岩体流变及结构性流变,揭示出深部软岩、高应力、强采动巷道围岩大变形与失稳机理。提出深部巷道围岩支护−改性−卸压协同控制理念,阐述了深部巷道围岩协同控制的本质内涵,分析了各种围岩控制方式时空协同作用,阐明了深部巷道围岩支护−改性−卸压“三主动”协同控制原理。提出深部巷道不同的围岩协同控制方式,研发出围岩支护−改性−卸压−“三位一体”协同控制技术,包括高预应力锚杆锚索及薄喷主动支护、高压劈裂注浆主动改性与水力压裂主动卸压技术;研发出高预应力、高压锚注协同控制技术,用于工作面超前段加强支护,形成深部工作面全域巷道(包括巷道、开切眼、超前段)围岩控制成套技术。研发出700 MPa级超高强度、超高延伸率(断后延伸率30%)、高冲击韧性新型锚杆材料;开发出纳米改性亲煤、亲岩单液无机有机复合注浆材料及微纳米双液无机有机复合注浆材料等3款高可注、高黏结、高强度注浆材料,及高强度、高韧性巷道表面喷涂护表材料。研发出高预应力、高压注浆锚杆与锚索。研制出35 MPa级气动高压注浆泵、45 MPa级液压高压注浆泵与压力−流量−密度多参数注浆监测系统;研制出井下直孔水力压裂装备与井下定向长水平钻孔高压大流量水力压裂装备。系统集成深部巷道围岩协同控制成套技术,在新集、新汶、淮北、皖北、彬长等深部矿区的复杂困难巷道得到成功应用,包括千米深井软岩巷道、超千米高应力巷道、千米深井强采动巷道、深部松软破碎围岩巷道及厚硬顶板强冲击巷道等。巷道围岩变形大幅降低,围岩稳定性显著提高,有力支撑了深部矿井的安全高效生产。最后,对未来深部巷道围岩控制理论、技术、材料及装备等的发展方向进行了展望。

     

    Abstract: China is rich in deep coal resources. With the continuous depletion of shallow coal resources, deep coal mining is imperative. Currently, over 40 coal mines in China have reached or exceeded a mining depth of 1 000 meters, with the deepest reaching 1 510 meters, mainly distributed in the central and eastern regions and the northeastern mining areas. Additionally, some mining areas in the west, such as the Ordos, Longdong, and Binchang mining areas, have also entered deep mining. Compared with medium and shallow mines, deep mines are characterized by high ground stress, strong mining-induced disturbance, large deformation (in soft rock) and strong impact (in hard rock). The deformation of the surrounding rock in deep mine roadways is marked by strong dilatancy, strong rheology and severely impact damage . The stress environment and geomechanical properties of the surrounding rock in deep roadways were deeply analyzed, and the deformation and failure characteristics of the surrounding rock in deep soft rock roadways were studied. It was found that the large deformation in deep soft rock roadways was mainly caused by three types of deformation: dilatancy, rheology of coal and rock mass, and structural rheology. The mechanism of large deformation and instability of the surrounding rock in deep soft rock, high stress and strong mining-induced disturbance roadways was revealed. The concept of coordinated control of surrounding rock support, modification and pressure relief in deep roadways was proposed. The fundamental principle of this coordinated control was expounded. The spatio-temporal coordinated action of various surrounding rock control methods was analyzed. The principle of “three active” coordinated control of surrounding rock support, modification and pressure relief in deep roadways was clarified. Different coordinated control methods of surrounding rock in deep roadways were proposed. The “three-in-one” coordinated control technology of surrounding rock support, modification and pressure relief was developed, including high prestressed bolts and cables and thin spray active support, high-pressure splitting grouting active modification, and hydraulic fracturing active pressure relief technology. The grouting bolting with high pretension and pressure in synergy control technology was developed for the advanced section of the working face to strengthen support, forming a complete surrounding rock control technology for deep working face roadways (including gateway, open-off cut and advanced area). New materials for bolting, such as a 700 MPa ultra-high-strength, ultra-high elongation (30% post-fracture), and high-impact toughness bolt, was developed. Three types of high injectability, high adhesion and high strength grouting materials, including nano-modified coal and rock-friendly single-liquid inorganic-organic composite grouting materials and micro-nano double-liquid inorganic-organic composite grouting materials, and high strength and high toughness roadway surface spraying protective materials were developed. Other innovations include the development of high prestressed grouting bolts and cables with high pressure, as well as 35 MPa pneumatic and 45 MPa hydraulic high-pressure grouting pumps, plus a pressure-flow-density multi-parameter grouting monitoring system have been developed. Underground local hydraulic fracturing equipment and underground directional long horizontal borehole large-flow hydraulic fracturing equipment with high-pressure were developed. The complete set of coordinated control technology for deep roadway surrounding rock was systematically integrated and successfully applied in complex and difficult roadways in deep mining areas such as Xinji, Xinwen, Huaibei, Wanbei and Binchang, including deep soft rock roadways, ultra-deep high stress roadways, deep strong mining-induced disturbance roadways, deep soft and broken surrounding rock roadways and deep thick hard roof strong impact roadways. The deformation of the surrounding rock in roadways was significantly reduced, and the stability of the surrounding rock was significantly improved, which strongly support the safety and efficient production of deep coal mines. Finally, the development directions of the theory, technology, materials and equipment for the control of deep roadway surrounding rock in the future were prospected.

     

/

返回文章
返回