At the same time,the new concept of reinforcement of slope by means of integrating the uses of tendon framework and the upward oblique unwatering hole techniques are presented by author too.

The gravity retaining wall slanting backward proved to be the best after discussion on the types of retaining wall with some engineering examples.

Present situation and countermeasures for unwatering in south mine of Huolinhe coalfield;

Depending on different conditions of hydrological geology, Jingling Iron Mine has adopted different methods of controlling underground water such as unwatering, integrated controlling, etc.