The Blast Design of Jindong Tunnel Earthwork Excavation;

On advance geological forecast of tunnels on karst or varied geological conditions;

Stress on Class tunnel restorations of the first mandibular molar;

The practical method of tunnel entrance landscape design and its design procedure are presented in this paper.

For ensuring the stabilization of slope around tunnel entrance, the tunnel design criterion gives out the definite demands to solpe gradient and excavating high, but these demands are confined only the sort of surrounding rock, can not judge the influence of layer property of surrounding rock and ground water.

Research purposes:The construction of tunnel entrance is the key part of the whole engineering.

By analyzing stress field of cavern tunnel diseases,the causes are studied and five reinforcement and protection grades for cavern tunnel diseases are given according to different defect form,defect behavior and development states,and corresponding examples are given.

Research purposes: Yichang-Wanzhou railway has 159 tunnels and 150 tunnel portals.

Because of the influence of the engineering geologic condition, hydrogeological condition and artificial factor, it is easy to have landslide at tunnel portal.

This paper has studied a rockbolt-lattice strengthening technology and its functional mechanism and construction technology used in ahigh slope of the Xiaowang tunnel portal,this study presents that it s a good method to apply the rockbolt-lattice strengthening technology to strengthen thehigh slope of the tunnel portal.