复杂条件下井筒煤柱开采三维有限元分析

1 前言目前,有限元计算广泛采用平面问题进行计算,很少采用三维有限元方法。但由于井筒保护煤柱处于空间状态,把三维空间问题作为平面问题处理必然存在着近似性。岩体力学理论认为:把岩体的空间问题做为平面问题研究要做许多假设,而由于岩石这种特殊的介质存在着各向异     

Research on deformation prediction method of soft soil deep foundation pit

In view of the characteristics of soft soil deep foundation pit for the construction and geotechnical characteristics of the special medium, it is difficult to calculate theoretically accurately structural deformation of the foundation pit, so in the course of excavation on the construction of the information is particularly important. The analysis and comparison of several popular non-linear forecasting methods, combined with the actual projects, set up a grey theoretical prediction model, time series forecasting model, improved neural network model to predict deformation of the foundation pit. The results show that the use of neural network to predict with high accuracy solution, it is the foundation deformation prediction effective way in underground works with good prospects. Supported by the Educational Department of Liaoning Province Through Scientific Research Project(20060051); National Natural Science Foundation of China (50604009); Universities Excellent Talents Support Plan to Train Foundation of Liaoning(RC-04-13)