摘要
针对大倾角煤岩层巷道围岩局部应力集中导致普通断面形状和支护方案难以控制围岩稳定的问题,本文以新汶矿区某矿6196疏水巷为工程背景,通过理论分析、数值模拟、工程实践等方法研究深部大倾角煤岩层巷道围岩应力分布特征和层间剪切滑移变形机制;综合考虑半圆拱形断面承载能力强、应力集中程度低和斜顶梯形两帮受力合理的优点,设计偏心圆弧拱形断面,提出非对称耦合支护方案,并通过工程实践验证其有效性。研究结果表明:大倾角煤岩层巷道上覆岩层的重力作用使巷道帮角部位发生剪切滑移变形,在巷道2个对角处产生应力集中而在另外2个对角处产生应力释放;大倾角煤岩层巷道左侧顶底板位移整体大于右侧顶底板位移,右帮水平位移整体大于左帮水平位移;基于偏心圆弧拱形断面和非对称耦合支护方案进行围岩控制,顶帮锚杆载荷逐渐趋于稳定,巷道顶底板和两帮的平均变形量分别为134 mm和112 mm,说明围岩变形均在允许范围,深部大倾角煤岩层巷道变形得到了有效控制。
Aiming at the problem that the local stress concentration in the surrounding rock of the deep and largeinclined coal and rock roadway makes it difficult to control the stability of the surrounding rock of the roadway with the ordinary section shape and support scheme, the 6196 drainage roadway of a mine in Xinwen mining area was taken as the engineering background. The stress distribution characteristics of surrounding rock and the interlayer shear-slip deformation mechanism of deep and large-inclined coal and rock roadway were investigated by theoretical analysis, numerical simulation and engineering practice. Considering the advantages of strong bearing capacity and low stress concentration of semicircular arch section, and reasonable force on the two sides of the inclined roof trapezoidal roadway, an eccentric circular arch section was designed. The asymmetric coupling support scheme was optimized, and its effectiveness was verified through engineering practice. The results show that the overlying gravity along the bedding direction of the deep and large-inclined coal and rock roadway causes the shear slip deformation of the roadway edge. The stress concentration occurs at the two opposite corners of the roadway and the stress release occurs at the other two opposite corners. The displacements of roof-floor on the left side of the deep and large-inclined coal and rock roadway is larger than that on the right. The horizontal displacement of the right side is larger than that of the left side as a whole. The loads of the roof bolts gradually stabilize when the surrounding rock control is based on the eccentric circular arch section and asymmetric coupling support scheme. The average displacements of the roof-floor and the two sides of the roadway are 134 mm and 112 mm, respectively. It is shown that the surrounding rock deformation is within the allowable range.The deformation of deep and large-inclined coal and rock roadway is effectively controlled.
作者
张进鹏
刘立民
刘传孝
赵艳鹏
孙东玲
邵军
ZHANG Jinpeng;LIU Limin;LIU Chuanxiao;ZHAO Yanpeng;SUN Dongling;SHAO Jun(College ofWater Conservancy and Civil Engineering,Shandong Agricultural University,Tai'an 271018,China;College of Energy and Mining Engineering,Shandong University of Science and Technology,Qingdao 266590,China;Heze Coal Power Co.Ltd.,Linyi Mining Group,Heze 274020,China;China Coal Technology Engineering Group Chongqing Research Institute,Chongqing 400037,China)
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2021年第11期4074-4087,共14页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(51974358)
山东省自然科学基金资助项目(ZR2021QE233)。
关键词
深部大倾角
煤岩层巷道
破坏机理
变形特征
偏心圆弧拱形断面
非对称耦合支护
deep and large-inclined
coal and rock roadway
failure mechanism
deformation characteristics
eccentric circular arch section
asymmetric coupling support
