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- 저자 : Ma Shili (검색결과 2 건)
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Ma Shili,Xie Liquan,Ji Yifan,Su Tsung-chow 대한조선학회 2022 International Journal of Naval Architecture and Oc Vol.14 No.1
Suction caissons are widely used as a promising alternative foundation for offshore structures under variable offshore environments. In this paper, a three-dimensional finite-element model which takes into account soil inelasticity was used to study the seismic behavior of a suction caisson in clay taken from an offshore wind farm in the Hebei province of China. The results showed that the maximum acceleration of the soil increases with increasing depth. There is a distinct amplification for relatively low frequencies when seismic waves propagate to the mudline. It was assumed that the rotation center of suction caisson under seismic conditions was virtually existent. The rotation center was obtained by the proposed formula to explore the movement positions of the suction caisson. The time of the peak of lateral displacement of the lid did not synchronize with that of the changing direction of displacement of the rotation center, indicating that the displacement of the lid can not be a comprehensive assessment of the position state of suction caissons. The point mass at the top of the wind turbine tower was responsible for the increase of vibration amplitude of displacement.
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Zhongyuan Xu,Tianbin Li,Guoqing Chen,Chunchi Ma,Shili Qiu,Zhi Li 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.8
PFC-GBM (Particle Flow Code-Grain Based Model) is the major and fundamental method to simulate rock behaviors in thispaper. Geo-materials are composed of micro-grains, the behavior of these grains and the interface between them influencemacroscopic behavior of materials. Traditional PFC simulation method could simulate the integral micro-behavior of material, andPFC-GBM simulation focuses on every different grains and interfaces to simulate micro-heterogeneity of material. In this paper, anattempt is made to investigate the strength of rock masses and the development of micro-cracks under thermal-mechanical couplingeffect. For this purpose, a numerical model is established based on mineral analysis and pre-existing mechanical experiments ofGranite from one of complex tunnels in Yunnan Province. After establishing the model, the specimen were first heated and thencompressed according to test sequence of laboratory experiments. The simulation results are calibrated to match the laboratory testresults including thermal behaviors and fracture development. The conclusion of simulations show that both of thermal behaviorsand fracture development are depended on the micro-heterogeneity of granite in UCS (Unconfined Compressive Strength)experiment, the characteristics of minerals influence the macroscopic fracture mechanism. The simulation reveals that in a certainrange of temperature (40oC ~ 90oC), temperature increasing enhance the brittle damage of granite. The situation of 130oC had theobvious thermal-crack before loading and then exhibited a much lower peak strength and failure strain. This numerical observationmay guide the underground construction in complex geo-environment.
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