考虑土性参数空间变异性的珠三角软土地区土钉支护结构可靠度分析

Reliability Analysis for Soil Nail Support Structure in the Soft Soil Area of the Pearl River Delta Considering Spatial Variability of Soil Parameters

如何定量定性描述软土土性参数空间变异性对准确确定软土土性参数和合理评价软土地区土钉支护结构稳定性至关重要。采用既有统计分析方法定量描述空间变异性通常需要大量数据,难以满足。本文基于随机场理论模拟软土土性参数空间变异性,建立了一套考虑土性空间变异性的软土地区土钉支护结构可靠度设计方法,最后以MATLAB软件包为平台进行计算程序的开发与工程实例研究。分析结果表明,本文采用随机场方法模拟软土土体固有空间变异性及其在土钉支护结构可靠度分析中的应用具有合理性与普适性。

How to quantitatively and qualitatively describe the spatial variability of soft soil properties parameters is crucial for accurately determining soft soil properties parameters and reasonably evaluating the stability of soil nail support structures in soft soil areas.The quantitative description of spatial variability using existing statistical analysis methods usually requires a large amount of data,which is difficult to meet.This paper simulates the spatial variability of soil properties parameters in soft soil based on random field theory.Then,a reliability design method for soil nail support structures in soft soil areas was established,taking into account the spatial variability of soil properties.Finally,the MATLAB software package was used as a platform for the development of calculation programs and engineering case studies.The analysis results indicate that the random field method used in this article to simulate the inherent spatial variability of soft soil and its application in the reliability analysis of soil nail support structures is reasonable and universal.