关键词: 超长大直径顶管, 复杂地质, 注浆压力, 土体变形

Abstract: This paper presents a case history of the pipe jacking for the wastewater discharge project of Tangxun Lake Sewage Treatment Plant. The force mechanism during the long-distance and large-diameter pipe jacking process is analyzed, and the influencing factors of the pipe joint floating and the sinking in the complex strata are studied. The reason for the floating of the machine head was analyzed through factors such as the mechanical properties of the strata where the pipe jacking is located and construction control. Based on the comprehensive on-site conditions, measures such as the supplementary exploration and the identification of geology, pre reinforcement treatment of soft soil areas, ballast treatment inside the pipe, activation of the relay rooms, the opening of holes at the bottom and top of the pipe joint, strengthening of pipe jacking connection, control of the jacking speed, and the timely correction of the deviation are taken to control the displacement of the pipe joint, so that the peak of the pipe joint on site falls back and the pipe joint is maintained in a stable state. To provide the theoretical basis and the technical support for the prevention of the head from floating or downloading during the subsequent pipe jacking construction in complex and uneven geological areas, as well as controlling the deformation of pipelines during pipe jacking construction.

Key words: Ultra Long and Large Diameter Pipe Jacking, Complex Geological Conditions, Grouting Pressure, Soil Deformation