Systematic laboratory tests on loess liquefaction are performed to study the testing methods,liquefaction mechanism,liquefaction criterion,influence factors and development of pore pressure and strain.

In accordance with the features of low porosity and low permeability in Mesozoic reservoirs on Yishan slope of Erdos Basin, reservoir properties are discriminated as per oil saturation calculated by using pyrolysis data, pyrolysis gas chromatography data and geochemical data, thus to establish reservoir discrimination standard.

According to some generally established discrimination standards, several simple and reprsentive discrimination methods were chosen.

Based on the strength identification standard of the existing service gate and the stiffness demand of the principal beam of the gate,defined in the Design Specification for Steel Gate of Hydraulic and Hydropower Project,the method is expounded about how t.

An effective criteria for dynamic instability of structures is put forward, and it is based on Bolotin s fandamental equation of dynamic stability.

Method for liquefaction discrimination of crushed stone piles composite ground is also proposed herein.