悬臂式单排桩可靠度分析研究

Reliability Analysis of Cantilever Single-row Piles

基于m法和p-y曲线法两种有限单元模型,对路堑边坡单排桩支挡结构进行静力分析,在此基础上,对悬臂式单排桩结构进行随机分析。结果表明:强度参数的变异性基本不影响荷载值的均值,均值的大小基本与确定性分析的荷载值相同;强度参数变异系数越大、相关距离越大,荷载值的变异性越大。最终,根据极限状态法反算的安全系数,给出路堑边坡单排桩支挡结构安全系数的建议值:在目标可靠度为3.7的前提下,一般变异性岩土取1.32,较高变异性岩土取1.48,高变异性岩土取1.63。

The two finite element models based on the m method and the p-y curve method are used to carry out static analysis on the single-row pile retaining structure of the cutting slope,and random analysis is carried out for cantilever single-row pile structure.The results show that the variability of the strength parameters does not affect the mean value of the load value,and the mean value is basically the same as the load value of the deterministic analysis;the larger the coefficient of variation of the strength parameter and the larger the correlation distance,the greater the variability of the load value.Finally,according to the safety factor which is calculated by limit state method,the recommended value of the safety factor of the single-row pile retaining structure of the cutting slope is given.Under the premise of the target reliability of 3.7,the safety factor of the general variability soil is 1.32,the medium variability soil is 1.48 and the high variability soil is 1.63.