A study on low strain integrity testing of platform-pile system using staggered grid finite difference method |
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| Institution: | 1. Mathematics Department, Truckee Meadows Community College, Reno, NV, 89512, USA;2. Department of Mathematics & Statistics, University of Nevada, Reno, NV, 89557, USA;1. Department of Mathematics and Statistics, University of Nevada, Reno, Nevada 89557, USA;2. Department of Mathematics, University of Wyoming, Laramie, Wyoming 82071, USA;1. Institute for Problems in Mechanics, Russian Academy of Sciences, 101 Vernadsky Avenue, Bldg 1, Moscow 119526, Russia;2. Bauman Moscow State Technical University, 5 Second Baumanskaya Street, Moscow 105005, Russia;3. National Research Nuclear University MEPhI, 31 Kashirskoe Shosse, Moscow 115409, Russia;4. Cardiff University, Heath Park, Cardiff CF14 4XY, UK;1. Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;2. School of Mathematics and Computer Science, Ningxia University, Yinchuan, 750021, China |
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| Abstract: | To study the three-dimensional characteristics of wave propagation in platform-pile system, a three-dimensional computation model for transient vibration of platform-pile-soil system is established. Based on initial and boundary conditions, the numerical solution of this model is obtained. A MATLAB program is compiled through using staggered grid finite difference method. The dynamic response of the integrate pile in platform-pile-soil system is got under vertical impact force, and the reliability and feasibility of the numerical simulation are corroborated by comparing calculation result with measured data of low strain integrity testing of platform-pile system. The optimal sensor location at platform top is studied. The results show the position distancing the pile center 0.5R~0.6R (R is pile radius) is the optimal sensor location, which the line between sensor location and pile center parallels the short side. It plays a certain role in reducing three-dimensional interference through increasing shear wave velocity of surrounding soil and appropriately increasing the ratio of characteristic wavelength to pile radius. In addition, contact area has less influence on low strain integrity testing of platform-pile system. |
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| Keywords: | Platform-pile system Low strain integrity testing Staggered grid Finite difference method Three-dimensional characteristics |
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