Engineering Geomechanical Studies about Stability of Rock Mass in Jinniushan Dam Site,Linxian Country Xu Xuehan and Guo Zhi Study on the Mechanical Characteristics of Rock Mass in a Underground Work Zhou Ruiguang and Sun Guangzhong Survey and Analysis of the Gentle Dip Fault Peng Jinfu Evaluation with Regard to the Action of Active Fault Gu Xun Prediction on the Elastic Modulus of Jointed Rock Mass——Application of Compound Material Theory in Rock Mass Mechanics Kou Riming and Wang Sijing Preliminary Study of a Theory on the Controlled Hydraulic Fractures and the Plan of Falling Roof Zhang Wenbin and Sun Guangzhong