Probabilistic Uplift Resistance of Pipe Buried in Spatially Random Cohesionless Soil

IF 0.8 4区 综合性期刊 Q3 MULTIDISCIPLINARY SCIENCES
Debarghya Chakraborty
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Abstract

The lower bound finite element limit analysis technique in conjunction with the second-order conic optimization is used to determine the uplift resistance of pipeline buried in spatially random cohesionless soil. The Cholesky decomposition method is employed to produce the spatially random discretized soil domain. The Monte Carlo simulation technique is implemented to obtain the probabilistic responses. The mean uplift factor and the failure probability of the pipeline for a wide range of practical cases of soil spatial variability are provided as the design charts. It is found that for the smaller value of correlation distance, the deterministic uplift factor is always higher than the mean uplift factor; however, with the increase in the correlation distance, the difference between the deterministic uplift factor and the mean uplift factor reduces. The probability of failure of pipeline is found to be increasing with the reduction in the magnitude of correlation distance and factor of safety. The influence of the soil spatial variability on the failure mechanism is also studied in detail.

Abstract Image

空间随机无粘性土中埋管的概率上拔阻力
将下界有限元极限分析技术与二阶二次优化相结合,确定了埋于空间随机无黏性土壤中的管道的抗拔阻力。采用Cholesky分解法得到空间随机离散化的土域。利用蒙特卡罗仿真技术获得了概率响应。在多种土壤空间变异性的实际情况下,给出了管道的平均抬升系数和失效概率作为设计图表。研究发现,当相关距离较小时,确定性隆升因子始终高于平均隆升因子;但随着相关距离的增加,确定性隆升因子与平均隆升因子的差异减小。随着相关距离和安全系数的减小,管道失效的概率增大。研究了土体空间变异性对破坏机制的影响。
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来源期刊
CiteScore
2.60
自引率
0.00%
发文量
37
审稿时长
>12 weeks
期刊介绍: To promote research in all the branches of Science & Technology; and disseminate the knowledge and advancements in Science & Technology
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