The application of composite steel tunnel support technique to tunnel collapse handle at the Zhenlong Hydropower Station,Shimian and its applicable conditions as well as perspective are set forth.

Combining an engineering practice,Integraty jack-up construction technique about bridges by organic steel shapes support was introduced in this paper,which has the characteristic of economical,security and easy construction.

Experimental Study on the Flow Conductivity of a new typed resin-coated sand proppants;

Development of a high-strength acid-resisting proppant;

Measurement and analysis of proppant sphericity and roundness;