Reliability Analysis Of Bearing Capacity For Sand In Shi Hezi Area Of XinJiang

Bearing capacity is very important design parameters of geotechnical engineering design . In determining the bearing capacity had a great deal of uncertainty and do not know the factors. Reliability theory is introduced to determine the bearing capacity of the foundation, through reliability indicators to assess the bearing capacity, made to determine the bearing capacity of the foundation toward more reliable, more rationalization in the direction of great practical significance.By using the homogeneous model with the random filed ,sample size of the random by as discrete,recursive spatial average number of Shi Hezi North bored reached statistical analysis Shi Hezi North typical soil from the self-correlation obtained from the relevant distance,average,coefficient of variation and so on .Based on this point again right variance reduction ,statistics obtained so different venues throughout the soil characteristics of the probability distribution .And different gradation and different density of the sand under the simulated load test with the standard penetration test comparative test .Through statistical regression analysis ,were made possible by the sand and fine sand standard penetration ultimate bearing capacity formula.In this paper, in the calculation of bearing capacity reliability indicators, with the introduction of the random filed theory and soil index self-correlation, Parameter with the mean and variance of space calculated with the actual safety closer to the value of reliability indexβ. Engineering calculation, we can see on the parameter variability on the reliability indexβvalue of a great impact and the value of SPT number of variability in sensitivity than the specific gravity variability of sensitivity. On a fixed-value method calculation of the safety factor of a certain value ,Due to the different coefficients of variation, reliability theory with the reliability index calculation values may vary enormously .