关键词: 深部巷道, 倾斜岩层, 弱面, 非均称失稳机制, 控制技术

Abstract: By adopting methods of geological survey, theoretical analysis, numerical simulation and industrial test, the paper has analyzed the deformation characteristics of roadway in deep inclined rock strata with weak plane. Moreover, the paper has revealed the asymmetric instability mechanism of such roadway, mainly including shear failure mechanism in weak plane, expansion mechanism of high stress soft rock and the inducement mechanism of surrounding rock instability of weak plane. Surrounding rock damage initially appears along weak plane. The shear-slip deformation in weak plane layer causes expansion of the failure zone of adjacent surrounding rock. The partial surrounding rock instability intensifies the deformation failure of other parts, which induces catastrophic instability of whole roadway. As weak plane plays an induction role in roadway deformation, the key for maintaining roadway stability lies in controlling the shear deformation in weak plane layer and the continuous deformation inpost- peak bearing stage in soft rock zone after the instability of weak plane surrounding rock. Based on high-strength and high pre-stress control principle, asymmetric control principle and whole section control principle, the author has developed a staged dynamic control technology which needs strong support, reinforced support for weak plane surrounding rock, heave floor control and secondary support as technical core. Through reinforcing the whole strength and bearing capability of weak plane and surrounding rock, the technology could control the roadway asymmetric deformation and maintain the long-term stability of roadway.

Key words: deep roadway, inclined rock strata, weak plane, asymmetric instability mechanism, control technology