The causes of abnormal quality of environmental water due to excavation of the underground powerhouse group of a pumped storage power station were analyzed in this study.

The rock mass fracture is considerably developed in underground caverns of Huanggou Pumped Storage Station,so it is significant for engineering construction to predefine whether there are unstable blocks on excavation planes of underground caverns.

Many large scale hydropower stations of our country are built in gorges among high mountains and some of them adopt the type of underground powerhouse.

The stress relaxation method,suitable for rapid measurement in underground tunnel,is introduced in detail in this paper,and the technical procedure and the results of ground stress measurement in Dahongshan Iron Mine mining area are presented as well.

Analysis on secondary stress field characters of hard surrounding rock in large underground caverns by elasto-brittle-plastic constitutive models;

The underground cavern is the one of important factors that damages the stability of the pit slope.

In order to study the effect of stability on roadway layout of deep soft rock pump house chambers,we analyzed the characteristics and reasons of the chambers\' deformation and destruction with conventional design,proposed the optimum design technology,discussed it\'s design principles,and introduced the equivalent formula of combined wells and the optimal construction process.