The geotechnical centrifuge testing is a useful tool to simulate complex geotechnical problems such as soil-structure interaction (SSI), offshore pipelines and dams. In deep foundation engineering, the geotechnical centrifuge testing can offer insight into the behavior of piles and its interaction with soil or with other structures such as a raft (mat foundation) or adjacent structures. This paper will present some application of geotechnical centrifuge testing on the complex interaction of micropiled raft (MPR) for both sand clay soils. Four MPRs centrifuge tests were conducted: three tests in sandy soil and one test in clay soil. In addition, single micropile and isolated raft foundation centrifuge tests were carried out in both sand and clay soils. The results of the centrifuge tests were used to calibrate and verify the non-linear three-dimensional finite element models for both the sand and clay soils. Subsequently, the verified models were employed to conduct a comprehensive parametric study. The parametric study focused on providing additional insights regarding the performance of micropiled raft system that should be helpful for the design engineers. The physical dimensions of MPR structural components and parameters considered in the parametric study are within the range used in the current practice. The results of the centrifuge tests and numerical parametric study were analyzed to establish design guidelines for micropiled rafts. The results of both centrifuge testing and numerical analysis can be used to develop some design guidelines and assess the available analytical solutions and offer some adjustment factors.
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