Since pipe jacking construction inevitably disturbs the soil layer,in order to clarify the ground instability and surface settlement and deformation caused by pipe jacking construction,the deformation and mechanical character-istics of pipe jacking construction are analyzed by FLAC3D with the background of the pipe jacking project of Mile Tem-ple Station of Line 5 in Kunming City,and the disturbance mechanism of the soil layer is investigated during the process of pipe jacking construction,and then corresponding settlement control measures are proposed.The results are as follows.The superposition of positive jacking force and formation damage generated by pipe jacking construction is the main factor leading to the deformation of the formation,and the disturbance of the formation caused by pipe jacking construction weakens the stiffness of the soil body,and the influence on the formation ranges from-5 m to 5 m in the Y-axis direction of the jacking face.In order to control the sensitive deformation of the soil layer caused by the pipe jacking construction,the soil layer stiffness is strengthened by reasonable grouting measures,and the sensitive deform-ation of the soil layer caused by the pipe jacking construction is controlled,at the same time,the lateral friction resist-ance during the pipe jacking construction process can be effectively reduced by grouting reinforcement to control the disturbing deformation of the ground layer caused by the construction.
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