Critical Surface Optimization Search And Stability Analysis Of Program Design

The soil slope stability analysis is always a very important problem in the goetechnical engineering. The paper mainly think of the stability analysis of the stratified soil slope and the slope with pore-water pressure, earthquake pressure and load on the top. All are been completed by computer program.In the tens years, many scholars have posed a lots of method of the soil slope stability analysis. There are many computer programs, and there many integrated softwares, however, there are still many problems.Firstly, the paper founds a computing model of soil slope safety factor. This model has thought of the stratified soil slope stability, and the stability of the soil slope with pore-water pressure, earthquake pressure and load on the top. It uses simplified Bishop's method and Janbu's method to compute safety factor, meanwhile, uses general method to analyze stratified soil slope stability, and uses effective stress method to analyze the stability of the slope with pore-water pressure, and uses pseudo-static method to analyze the stability of the slope with earthquake pressure, and uses alternative homogeneous soil method to analyze the stability of the slope with load on the top;Next, it unites pattern search algorithm, and random search algorithm to search critical slip surface, which can avoid searching slowly and the risk to get to "local optimization solution" with single optimization algorithm;And then, it has been programmed using Visual Basic 6.0 which has strong function and is used to engineering practice. User can search slip surface and calculate its safety factor by computer;And then, the paper use this program to compare to existing programs, which indicate that this program is effective, and to calculate many dates, whose results are basically identical with present theory;Finally, the paper calculate and analyze two engineering projects using the program, whose results are basically identical with the results of Tongji Qimstar Slope 1.0 and practice, which go step further to indicate that the research method of the soil slope critical slip surface is superior and the program is effective.