摘要
通过CPT资料研究土性参数随机场特性是一种比较理想的方法。土性参数随机场的平稳性是后续研究的先决条件之一,可以通过Bartlett统计量进行检验,但采用不同的模型拒绝域相差比较大,这样给实际应用造成困难,新模型LGS由于适应范围广可以解决这一问题。从随机场的基本理论出发,介绍了新相关模型LGS的数值模拟方法。基于LGS相关模型,采用修正的Bartlett统计量对随机场平稳性进行检验,统一了拒绝标准。用两组数据进行了实例分析,通过编制的程序进行计算,结果表明,这种相关模型对不同形式的相关函数有较好的适应性,可以解决拒绝域不统一的问题。
Cone penetration tests (CPT) measurements are widely used in soil characterization. An important precondition for subsequent study is the stationarity of the soil random field, which can be tested by Bartlett statistics. But the rejection criteria is not accordant when using different autocorrelation models, which brings difficulty in Practical using. The new model, LGS, can solve this problem because it can be adaptive with different autocorrelation functions. The simulation of the new autocorrelation model, LGS, is presented based on the random field theory. The stationarity of soil characteristics is tested using modified Bartlett statistics based on the autocorrelation model, LGS, which unifies the rejection criteria. Two examples are analyzed; the result calculated by the program shows that this new model is adaptive with different autocorrelation functions; and the problem of rejection criterion can be solved well.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2009年第9期2753-2758,共6页
Rock and Soil Mechanics
基金
国家自然科学基金重点项目(No.50639010)
关键词
随机场
相关函数
相关模型
相关距离
平稳性
Bartlett统计量
random field
autocorrelation function
autocorrelation model
correlation distance
stationarity
Bartlett statistics