Comparative research on the pipe-soil frictional resistances of circular and rectangular pipe sections during trenchless pipe jacking.

The relationships between the average pipe-soil frictional resistances F a and the buried depths H of jacking circular and rectangular pipe sections in sandy soil and coal granular layer are obtained respectively, and the fitting relationship between lateral pressure coefficient K and buried depth H of jacking circular and rectangular pipe sections in sandy soil and coal granular layer are also obtained respectively, i.e., with the increase of pipe section buried depth H , the lateral pressure coefficient K shows an increasing trend, and the increasing range is smaller and smaller.

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