Research On Reliability Of Anchor-pile Retaining Structure

Foundation excavation design and construction is a high risk and complex systematic engineering. The failure probability of foundation pit is often greater than that of the main project. Traditional foundation design method uses safety factor for analysis and checking. In safety factor methods, the dates related to design parameters and design conditions are all definite. As a result the calculations obtained are also definite. The biggest defect of this method is that the random variability and uncertainty of parameters, and the uncertainty of calculating mode are ignored. Therefore, although the safety factor method uses definite dates to express security index, it can't express the stability and security of the supporting structure quantitatively. The safety factor method doesn't meet the actuality of engineering.The reliability design method of foundation pit uses probability to express foundation pit security influenced by uncertainty, correlation, variability, distribution patterns of the soil parameters and other factors. The meaning of reliability index is clear. When it is used in computational analysis and support programs decision-making, people can improve the purpose and ratio of capital use maximum.According to a large number of relevant literatures, this article use the reliability theory to systematic summarizes and analyze calculating anti-overturn and stability method of Single-Fulcrum-anchor supporting Pile. Using Matlab to simulate JC optimized algorithm and Monte-Carlo algorithm, this article focus on the security of Single-Fulcrum-anchor supporting Pile influenced by prestressing loss of ground anchor bar, ground overload, variability of soil parameters. Finally, I obtain some useful conclusion.In all of failure modes of Single-Fulcrum-anchor supporting Pile, overturning failure is the majority failure mode. In the calculation of anti-overturn, the influence affected by loss of prestress is bigger than that of in overall stability. In the calculation of anti-overturn, the influence affected by ground overload is less than that of in overall stability. The affects caused by the variability of cohesion and ground-load is obviously in the failure calculation of supporting structure. When the variability coefficient of soil are bigger than 0.2, we consider them too big to be used in the supporting structure design.By analyzing, the method adopted and the program is feasible in this paper, which plays an important role in design and construction filed..