关键词: 超软弱地基, 顶管施工, 混合浆液, 灌浆

Abstract:

In the construction of pipe jacking in tunnel culvert reconstruction section, Lashi diversion work of Lijiang City, the stratum is extremely uneven lake-deposition silt, peat and other super soft foundation, causing difficulties to form necessary guidance force in jacking process, so the head of the pipe jacking is easily to sinks and skews. Aiming at this problem, the reinforcement treatment measures for lake-deposition silt, peat and other super soft foundation were analyzed and studied. A new construction technology that is carrying out grouting by mixed slurry of cement, bentonite and clay was proposed, which can improve the super soft foundation strength and bearing capacity. The engineering practice shows that this newpipe jacking construction technology based on mixed slurry is simple, fast and low cost.

Key words: super soft foundation, pipe jacking construction, mixed slurry, grouting