Research on the Sending Ditch Form of Long-distance Pipeline Jacking in High Water Level and Weak Geological Conditions
During the construction of long-distance pipelines,it is inevitable to carry out pipe jacking and crossing.When the crossing depth is large,the fabrication of pipeline jacking working wells and pipeline sending ditches is greatly affected by geological conditions.When the underground water level in the construction area is high and the soil is weak,the excavation of the sending ditch with steel sheet piles(cross bracing)supports may lead to the risk of deformation and collapse of the support system due to excessive soil lateral pressure.Based on the design and construction of a certain railway pipeline jack-ing crossing project,and by comparing and analyzing various pipeline sending methods,this paper pro-poses a foundation pit structure system of cast-in-place pile plus high-pressure jet grouting pile water stop curtain support,internal crown beam and waist beam plus internal support,as the pipeline sending and receiving well,and the pipelinesending is successfully completed.This paper provides a reference for the selection,design,and construction of the pipeline sending method for pipeline jacking in simi-lar high water levels and weak geological conditions.
long-distance natural gas pipelinepipeline jacking crossingweak geologydeep foun-dation pitpipeline sending
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NSTL
万方数据
维普
