【摘要】 井筒是联系地面工业广场和地下固体能源的主要通道,井筒围岩稳定性对保证矿井安全运营至关重要。为解决马钢集团姑山矿露转井工程立井过松散层井壁变形控制难题,借鉴岩土工程软土地基处理技术,提出采用高压旋喷技术处理浅部松散层,并在现场成功应用。结果表明:采用高压旋喷技术对松散层进行处理后,能够有效降低因地层疏水沉降对井壁造成的“负摩阻力”,避免井壁发生剪切破坏;井壁竖向应力和水平位移随着埋深增加而增加,采取加固措施后,井筒围岩承载能力增加,变形量明显减少;在开挖过程中发现松散层被胶结成完整块体,松散层渗透系数明显降低,施工条件得到明显改善。该技术方案可为类似工程设计提供参考。更多还原

【Abstract】 A mine shaft is a main passageway to contact a ground industrial square and underground solid energy and a stability of the surrounding rock in the mine shaft would be crucial importance to ensure the safety operation of the mine.In order to solve the deformation control problem of the shaft lining as the mine shaft passing through a loose layer during Gushan Mine changed from an open mine to underground mine in Maanshan Iron and Steel Group,in references to the soft land foundation treatment technology in the geotechnical engineerings high pressure rotary injection technology was provided to handle a shallow depth loose layer and the technology was successfully applied to the site.The results showed that after the high pressure rotary injection technology applied to handle the loose layer,the technology could effectively reduce a "negative frictional resistance" to the mine shaft lining due to the water drainage settlement and could avoid the shear failure occurred in the mine shaft lining.The vertical stress and the horizontal displacement of the mine shaft would be increased with the depth increased.After the reinforcement measures conducted,the loading capacity of the surrounding rock along the mine shaft would be increased and the deformation volume would be obviously reduced.During the shaft sinking,the loose layer was found to be cemented into a complete mass,the permeability coefficient of the loose layer was obviously reduced and the construction condition was obviously improved.The technical plan could provide the references to the similar engineering design.更多还原