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| Research on the Stress Characteristics ofTransverse Static Pressure with Compaction Technology on Loss Foundation |
| MI Wei - jun1，JIA Yan2，QU Yao - hui1，WU Xiao - peng1 |
| (1. Northwest Research Institute Co. Ltd of C. R. E. C，Lanzhou，Gansu 730000 ，China; 2. Lanzhou Railway Survey and Design Institute Co. Ltd，Lanzhou，Gansu 730000，China) |
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Abstract Research purposes ： The traditional treatment method of collapsible loss foundation，such as shock， ramming，sinking，blasting， cannot be used in small space and narrow site. Based on the special requirements of foundation treatment standard for grade A building and small space，the newly developed equipment non - vibration - lateral hydrostatic extrusion device， using the method of lateral static pressure compaction， converts the vertical hydraulic power to a horizontal force applied to the soil around the dense cone in the process of extruding and forming， and produces compression deformation of the soil to achieve the compaction effect. Non - vibration - lateral hydrostatic extrusion device is cone -shaped， and extrusion hole is completed in the opening and closing process of extrusion element to transform radius and vertical shrinkage of the guide element. Research conclusions:( 1 ) In the process of extrusion， the surrounding soil is presented as an elastic plastic deformation， the stress characteristics accord with the small hole expansion theory and the limit equilibrium theory. (2) When the pore size of 0. 41 m is reached， the hydraulic pressure of the power unit of the extrusion device is 231.35 kN，the horizontal force of the soil is 903. 07 kN after transformed into horizontal force. ( 3 ) The vertical hydraulic pressure is completely balanced with the soil，and does not need the vertical impact force and vertical gravity weight in the whole process, which can also achieve the miniaturization, portability and operability of the construction Equipment. (4)The research achievements can be used to provide theoretical basis and technical support for non - vibration compacting process in collapsible loess foundation.
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Received: 27 August 2015
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2016, Vol. 33 
