岩土参数随机场计算机模拟及其工程应用

基于随机场模拟的局部平均细分法理论,借助随机数发生器的子程序库,实现随机场可靠性分析的计算机模拟,并结合有限元软件ANSYS的后处理模块将模拟结果可视化,进而分析离散尺寸和相关距离对模拟结果的影响,通过工程实例,应用随机场计算机模拟结合Monte-Carlo抽样分析的手段,进行工程可靠性分析。结果表明随着相关距离的增加,随机场的变化特性减慢;越靠近上部的土层,土性参数的不确定性对基础沉降的概率反映特性的影响越大。研究成果不仅提供岩土参数随机场计算机模拟的实现方法,而且诠释其应用过程,完善随机场理论在岩土工程可应用领域的一个重要拼图。

Computer Simulation and Engineering Application of Soil-parameter Random Field in Geotechnical Engineering

Based on the local average subdivision algorithm and the subroutine library of random number generators ,com-puter simulation of random field were obtained and visualized by adopting the post processor of ANSYS .Hence ,two com-mon influential factors such as discrete sizes and correlation distances were analyzed .In addition ,a case study was con-ducted to verify the effectiveness of the computer simulation using Monte -Carlo sampling method .The results show that with the increase of correlation distance ,the features of change of random field slow down .As near to upper soil layer , the uncertainty of soil parameters greatly impacts the probability characteristics of foundation settlement .The conclusions of this paper can not only provid approaches to simulate the representative random fields of soil profiles ,but also demon-strate procedures in engineering application .Furthermore ,it can be very helpful to develop the technology systems about applications of random field theory for reliability analysis in geotechnical engineering .