摘要
由CPT和静载试验结果综合确定钻孔灌注桩竖向极限承载力,以沿深度方向的一维平稳高斯随机场作为桩基土层土性参数的数学模型,利用相关函数法和变异函数法计算土层的相关范围,进而对相同场地各试桩的承载力进行折算后检验其概率分布,并估计有关统计参数;考虑群桩效应,由桩基沉降反算其作用效应,计算单桩及群桩的可靠度指标。并与未采用随机场模型的计算结果相比较,对竖向荷载下桩基可靠性进行了较系统的研究。
The formula for evaluating the loading force of the bored piles has been obtained by the data of static cone penetration （CPT） and static load test. Based on the model of one-dimension stationary Gaussian random fiekls of soils around the pile, the method of correlative function and wariable function is adopted to calculate the relevant range of the soils. Then the probability distribution of the capacity of the site piles is checked and the relevant statistics parameter is evaluated. Considering the efficiency of the bored piles, the impact has been obtained by using the data of the pile settlement. A1 last, the reliability index of the single pile and the bored piles has been calculated and compared the result to that doesn＇ t consider random fields model. The reliability analyses of bearing capacity of bored piles has been carried out.
出处
《岩土工程技术》
2005年第5期268-271,共4页
Geotechnical Engineering Technique
关键词
可靠指标
平稳随机场
群桩
reliability index
stationary random fields
group piles
