CAJ | 학술논문

针对新疆沙吉海矿区中生代复合型软岩产生的顶板离层冒落、侧墙鼓出、底板鼓起等非线性大变形破坏现象,综合应用现场工程地质调查、理论分析、数值计算、物化分析、软岩水理作用测试、现场测试等手段和方法,深入分析本区中生代复合型软岩巷道围岩的分子膨胀+岩体结构面错动+开挖扰动的复合破坏机制,提出以恒阻大变形锚网索耦合支护为核心的主动支护技术体系.通过恒阻装置充分释放围岩膨胀能和塑性能,减小支护荷载及高应力集中,同时借助高阻性能抑制过大有害变形,合理控制围岩塑性圈;然后通过锚网索二次耦合支护消除围岩塑性大变形、层间软弱结构面的错动引起的围岩–支护之间的变形不协调,并采用注浆锚管控制底鼓大变形,最终形成围岩–支护结构协同承载体系.基于非线性大变形力学设计方法及数值分析,进行施工过程设计及参数设计.工程实践表明,该技术得到成功应用,保证了巷道的稳定.
침대신강사길해광구중생대복합형연암산생적정판리층모락、측장고출、저판고기등비선성대변형파배현상,종합응용현장공정지질조사、이론분석、수치계산、물화분석、연암수리작용측시、현장측시등수단화방법,심입분석본구중생대복합형연암항도위암적분자팽창+암체결구면착동+개알우동적복합파배궤제,제출이항조대변형묘망색우합지호위핵심적주동지호기술체계.통과항조장치충분석방위암팽창능화소성능,감소지호하재급고응력집중,동시차조고조성능억제과대유해변형,합리공제위암소성권;연후통과묘망색이차우합지호소제위암소성대변형、층간연약결구면적착동인기적위암–지호지간적변형불협조,병채용주장묘관공제저고대변형,최종형성위암–지호결구협동승재체계.기우비선성대변형역학설계방법급수치분석,진행시공과정설계급삼수설계.공정실천표명,해기술득도성공응용,보증료항도적은정.
@@@@In view of failure phenomena with nonlinear large deformation including roof subsidence,sidewall bulge and floor heave occurred in mesozoic compound soft rock of Shajihai coal mine in Xinjiang,according to the methods of geological survey,theoretical analysis,numerical calculation,physicochemical test,hydrological properties test of soft rock,in-situ test,the composite failure mechanism of molecular expansion,movement of structural plane and excavation disturbance for mesozoic compound soft rock roadway in this area is analyzed deeply. Then,an initiative supporting technology system which is based on constant resistance with large deformation coupling support is proposed. Firstly,through constant resistance device,the swelling and plastic energy of surrounding rock is released fully;and the support load,stress concentration are reduced. With the aid of high-resistance performance,the excessive harmful deformation is restrained;and the plastic zone of surrounding rock is controlled reasonably. Secondly,uncoordinated deformation between the surrounding rock and support,which is caused by large plastic deformation and the dislocation of weak structural plane,is eliminated through the secondary bolt-net-cable coupling support. Grouting bolt is used to control large deformation of floor heave. Ultimately,a collaborative bearing system of the surrounding rock-supporting structure is formed. The optimizations of construction process and parameter design are studied based on the design method of nonlinear large deformation mechanics and numerical analysis. Engineering practice shows that this technology has been successfully applied to ensure the stability of roadway.