According to the complex geological conditions at 21112 face,such as large coal hardness,the local fine-grained sandstone roof,fully mechanized mining with caving of roof coal in the second hierarchical seam,pre-splitting with loose blasting,soften with hydraulic fracturing and fit coal caving technology are pointed out by theory analysis and the scene measuring.

Taking cutting landslide of expansive soils controlled by discontinuities as an example,a simple mechanical model considering water swelling is proposed,which takes the strain-softening and water-softening of slip surface materials under the condition of rainfall into the consideration.

Improving the process of softened water production in order to reduce costs and increase benefits;

A study on softened water monitor;

Application of Design for Six Sigma in preparation of softened water;