Analysis of the Influence of Grouting Pressure on Pipe Joint Damage in Large Rectangular Pipe Jacking
In order to understand the influence mechanism of grouting pressure fluctuations on pipe joints in large cross-section rectangular pipe jacking,this paper relies on a large cross-section rectangu-lar pipe jacking project in Nanjing,and uses research metho-ds such as theoretical analysis,engineering analogy,and numerical simulation to investigate the influence mechanism of grouting pressure fluctua-tions on the stress state of large cross-section rectangular pipe joint structures under local pressure sup-pression condit.The external loads of large cross-section rectangular pipe joints was calculated,and the concrete damage plasticity model built-in ABAQUS software was used for numerical modeling to study the damage evolution mechanism of reinforced concrete pipe joints under different grouting pressures.The results show that:(1)grouting load,as a variable load,has a significant impact on the stress dis-tribution of the pipe joint,such that the grouting pressure should be included in the design of the pipe joint;(2)For this project,the theoretical grouting pressure is 0.311 MPa.In view of the need to sup-press the carrying-soil effect,the grouting pressure should be appropriately increased,but it must be controlled within a reasonable range;and(3)From the perspective of damage evolution,when the grouting load reaches 0.6 MPa,the tensile damage to the top plate of the pipe joint has reached a high level.Therefore,0.6 MPa is used as the grouting pressure warning indicator for this project,while 0.9 MPa should be used as a control indicator for grouting pressure.
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