地面式钢衬钢筋混凝土管道过活断层措施与地基接触特性研究

Research on Contact Characteristics between Ground Steel-lined Reinforced Concrete Pipeline across Active Fault and Foundation

采用钢衬钢筋混凝土管道结构形式,在管线中布置若干个波纹管伸缩节以吸收断层错动位移,研究了该布置方案下管道结构对活断层蠕滑变形的适应性和地基接触特性。研究结果表明,波纹管伸缩节可以承担大部分的断层错动变形,减小断层错动对管道的影响;管道与地基间摩擦系数和粘聚力越小,地基对管道的约束作用越弱,管道与地基之间相对滑移量越大,伸缩节承担的轴向变形越大,说明伸缩节更能发挥调整位移的作用,但摩擦系数和粘聚力的影响幅度并不大。

The steel-lined reinforced concrete pipeline structure is used in a water diversion project and several bellow-type expansion joints are arranged in the pipeline to absorb the fault displacement.The adaptability of the pipeline structure to the creeping deformation of active fault and the ground contact characteristics under this layout scheme are studied.The research results show that,(a)the bellow-type expansion joints can bear most of the fault deformation and reduce the impact of fault displacement on the pipeline;and(b)the smaller the coefficient of friction and cohesion between pipeline and ground foundation,the weaker the constraint of foundation on pipeline,the greater the relative slippage between pipeline and foundation,and the greater the axial deformation borne by expansion joints,which illustrates that the expansion joints can play a greater role in adjusting the displacement,but the impact of friction coefficient and cohesion is not large.