Concrete slab of prestress without bond in winter construction was described Based on the calculation of thermos calculation formula in the criterion and early strength estimation formula,the comprehensive thermos method was selected rationally while putting some antifreezing admixtures and strengthen admixtures in the concrete with lower thermos curing The good results were shown in the projec

Analysis of influence of discontinuous plane on strength of rock mass based on unified strength theory;

Computing joint persistence ratio and strength of rock mass by using rock discontinuity network simulation;

Researching influence mechanism of seepage on rock mass strength;

Fractal model of rock mass strength and its application;

Then,the impacts of the rock mass quality parameters m,s value on rock mass strength in Three Gorges Project permanent navigation lock of Yangtze River were studied,and the relationships among m,s values,Hoek-Brown strength envelope curve,and instantaneous internal friction angle φi were established.

The study of impact on the rock quality parameter m,s value to rock strength are executed in combination with high rock slope of the permanent navigation lock for Three Gorges Project on the Yangtse River.

By the application of the joint system network simulation in the rock mass strength study of an airport project, the paper systematically introduces the method and the procedures of this theory and the computer simulation.