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盾构法凭借其掘进速度快、造价低、围岩扰动小等优势而广泛运用于长大斜井施工,但当遇软弱围岩时,由于围岩向盾构内部变形挤压极易造成护盾抱箍、卡机等灾难性事故发生。本文依托新街台格庙矿区和补连塔矿区斜井工程。首先,基于围岩扰动再平衡理论,考虑埋深和岩性等因素,获得了不同埋深下斜井极限位移;其次,针对盾构实际掘进过程中前后盾与围岩之间存在不均匀间隙的特点,分析了不同位移条件下卡盾存在的可能性;最后,从“前大后小阶梯递减”盾构设计、扩挖、回填豆砾石、主动长锚索控制等方面提出了软岩变形分阶段处置措施。其结论为类似工程提供参考和借鉴。
Shielding is widely used in the construction of long and inclined shafts due to its advantages of fast excavation speed, low cost and small perturbation of surrounding rock. However, due to the weak surrounding rock, Shield hoops, card machines and other catastrophic accidents. This article relies on the Xinjie Taigemiao mining area and Buqueta mining inclined shaft project. First of all, based on the theory of surrounding rock disturbance rebalancing, taking into account factors such as burial depth and lithology, the limit displacement of inclined shafts under different burial depths is obtained. Secondly, in view of the uneven gap between the shield and the surrounding rock in the actual tunneling process The possibility of the existence of the card-shield under different displacement conditions was analyzed. Finally, the paper proposed a new design method of the shield-shield with different displacements. Finally, Rock deformation stage treatment measures. The conclusion provides a reference and reference for similar projects.