A great deal of experience in appraising pile\'s bearing capacity at extremely soft (soft) soil has been accumulated during civil engineering at Hefei.

Optimum road design in the very soft rock coal mine;

Research on two-roadway timbering technology at comprehensive mechanization caving coalface with very soft rock and combustible thick seam;

Treatment of very soft rock in Shapotou Water Control Project is a grave subject to be dealt with in project construction.

It is difficult to control the deformation of the extremely soft rock roadway which has the character of continuous plastic deformation by using the single supporting mode.

This paper introduces the engineering geological nature of the soft rock and extremely soft rock which were distributed over the south segment of QINLING MOUNTAIN in Xi Kang railway.

Research has been in progress round the technology difficult problem that mines in the thick coal seam of extremely soft rock and easy self-ignition of TieFa coal industry group by this thesis.

Initial hardening and strength reduction of compression saturated soft rock and its constitutive model;

Based on the in-situ measurements of ground pressure and physical and mechanical properties of rocks, and analysis of minerals composition and fissures in rock, the type of soft rock was determined to investigate the deformation and failure of surrounding rocks and floor heave in extremely soft rock roadway in Guhanshan Coal Mine.