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  Monitoring the Variation of Rotor Pressing Forces and Horizontal Soft Soil Pressure during Shield Tunneling

  The authors carried out a geo-mechanical monitoring of shield tunneling in soft loam. The forces N in cutterhead-pressing jacks are controlled by the pressure cells in hydraulic systems at the second “Serebryanoborsky” tunnel driving (D = 14.2 m) in Moscow. The curve N oscillates. Laws of change of the horizontal component of soil pressure caused by formation of slip planes in rock mass ahead of the face were found by means of numerical simulation.

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