According to the digging working conditions of hydraulic diggers,this paper presented such questions as distribution feature analyses of theoretical digging force in shole digging area of diggers,and had a study on distribution feature at each digging working condition,and developed relevant software.

Estimation of dredging operation resistance of drag suction dredger;

It is analysed of the surface movement resulting from engineering excavation, such as underground mines, open-pit mining, railway, highway, foundation pit, tunnel and underground engineering, and its deformation's characteristics.

Technical control of the excavation of spillway for the Gongboxia Hydropower Station;

The various measures,such as pre-casting through advanced installed pipe shed,grille steel frame or profiled bar support,top arch net, system rockbolt,and injecting concrete,were used to deal with the technical difficulties under bad geological conditions during excavation of tunnel within V type surrounding rocks.

The excavation of left bank abutment of the Hongjiadu hydroelectric project was the highest cut slope in the hydropower construction project then.

By introducing the excavation construction of tunnels type ancho r hole in the Second Changjiang Rivers in Chongqing Wanzhou, brief summary and the ana lysis to construction technology of tunnels type anchor hole for rope bridge wer e presented.

The paper presents the features and difficulties in excavation and support of the surge shaft of Lijie hydropower station on the Bailongjiang river,and describes various technical measures taken in excavation construction as well.