Robust Geotechnical Design of Single Pile

Feng Zhang, Feng Zhou, Jian-yang Cheng

Abstract


Pile foundations are used widely in engineering. Meanwhile, the calculation method and the reliability of the pile vertical bearing capacity receive more and more attention of the engineers. The pile capacity is affected by the uncertainty of soil parameters in soil. Aiming at solving this problem, we present herein a robust geotechnical design (RGD) as a new geotechnical design concept. Firstly, the mean and standard deviation of the soil parameters are taken into account the uncertainty of soil parameters in RGD method, and expand the scope of the RGD method in the pile vertical bearing capacity from sand to clay by increasing more soil parameters. Secondly, the pile side friction (Qside) is calculated layer by layer via the RGD method, which is used as one of the uncertain parameters in the change of applicability of the pile vertical bearing capacity by layered soil. Both of ultimate limit state (ULS) and serviceability limit state (SLS) are used as performance function in the design of pile. In this paper, as a safe evaluation standard, design robustness is used to evaluate the feasibility of the design scheme in the design of pile with the RGD method. With the RGD approach, the focus is to satisfy two design objectives, namely cost-efficiency and robustness. As with multi-objective engineering optimization, it is possible to provide a best solution set to accomplish the goal both in costefficiency and robustness. Meanwhile, the pile vertical bearing capacity of the design is guaranteed.


Keywords


pile; layered soil; uncertainty; robustness

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