To decrease,prevent,and early stage discovery the complication of vagina childbirth through probing into the reason of a soft birth canal hematoma,the 12 examples of a soft birth canal hematoma and related factors were analysed.

According to the failure mechanism,the analysis of supporting in soft-rock roadway and,the concept of initiative supporting,the authors have make a theoretical analysis of the technologically and economically effective practice with bolt-grouting reinforcement at-420m main return way on East-Four mining area in Pansan Colliery.

Combining on-the-spot actual measurement with numerical calculation,the authors have discussed the deformation laws and failure features of floor lift in soft-rock roadway,which would help to solve the problem of soft-rock roadway supporting.

Based on the soft-rock roadway of Enhong colliery in Yunnan province,this paper analyzes by nmuerical simulation the three supporting plans for soft-rock roadway junctions.

Several support methods of soft rock tunnel;

Research on the controlling parameters for smooth blasting in soft rock tunnel;

Research on nonlinear mechanics design method of bolt-net-anchor coupling support for deep soft rock tunnel;