The Experts below are selected from a list of 306 Experts worldwide ranked by ideXlab platform
Masaru Tateyama - One of the best experts on this subject based on the ideXlab platform.
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seismic Earth Pressure exerted on retaining walls under a large seismic load
Soils and Foundations, 2011Co-Authors: Kenji Watanabe, Junichi Koseki, Masaru TateyamaAbstract:ABSTRACT In recent years, serious damage has been done to retaining structures because of large Earthquakes. In order to establish practical methods for evaluating the seismic Earth Pressure, which is one of the important external forces acting on retaining structures during large Earthquakes, a series of shaking table tests was conducted on retaining wall (RW) models. The experiments revealed that the seismic active Earth Pressure was considerably smaller than that obtained by the Mononobe-Okabe theory, particularly under a large seismic load. Furthermore, it was demonstrated that the seismic Earth Pressure had an upper limit, which was determined by the force equilibrium of the soil wedge at the critical state when the RW lost its stability. On the basis of the test results, a new method to evaluate the seismic Earth Pressure for practical designs under a large seismic load has been suggested. This proposed method provides a reasonable Earth Pressure as well as an angle of failure plane, those of which depend on the seismic stability of the retaining wall. It has been confirmed that Earth Pressure obtained by the proposed method agrees well with the measured seismic Earth Pressure exerted on several retaining walls with different degrees of stability.
Kenji Watanabe - One of the best experts on this subject based on the ideXlab platform.
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seismic Earth Pressure exerted on retaining walls under a large seismic load
Soils and Foundations, 2011Co-Authors: Kenji Watanabe, Junichi Koseki, Masaru TateyamaAbstract:ABSTRACT In recent years, serious damage has been done to retaining structures because of large Earthquakes. In order to establish practical methods for evaluating the seismic Earth Pressure, which is one of the important external forces acting on retaining structures during large Earthquakes, a series of shaking table tests was conducted on retaining wall (RW) models. The experiments revealed that the seismic active Earth Pressure was considerably smaller than that obtained by the Mononobe-Okabe theory, particularly under a large seismic load. Furthermore, it was demonstrated that the seismic Earth Pressure had an upper limit, which was determined by the force equilibrium of the soil wedge at the critical state when the RW lost its stability. On the basis of the test results, a new method to evaluate the seismic Earth Pressure for practical designs under a large seismic load has been suggested. This proposed method provides a reasonable Earth Pressure as well as an angle of failure plane, those of which depend on the seismic stability of the retaining wall. It has been confirmed that Earth Pressure obtained by the proposed method agrees well with the measured seismic Earth Pressure exerted on several retaining walls with different degrees of stability.
Cheng Shao - One of the best experts on this subject based on the ideXlab platform.
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Earth Pressure prediction in the chamber for Earth Pressure balanced shield machines
International Journal of Computer Applications in Technology, 2018Co-Authors: Xiaoli Zhou, Cheng ShaoAbstract:Earth Pressure balanced (EPB) shield machines are large and complex mechanical systems and have been widely applied to tunnel projects. The Earth Pressure in the chamber is very important for EPB shield machines to avoid ground settlement and guarantee safe construction during the tunnelling process. In order to improve the prediction accuracy of the Earth in the chamber, we propose a new Earth Pressure prediction method in this paper. At first, we analyse the main factors influencing the Earth Pressure in the chamber and determine the inputs and output of the prediction model. Then, we use the least squares support vector machine to establish the prediction model whose parameters are optimised by the particle swarm optimisation. The experimental results demonstrate that the proposed method has high prediction accuracy and is an effective way to predict the Earth Pressure in the chamber for EPB shield machines.
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ICAC - Earth Pressure multipoint forecasts and optimal control for EPB shield
2014 20th International Conference on Automation and Computing, 2014Co-Authors: Yan Zhang, Cheng ShaoAbstract:This article discusses multipoint Earth Pressure prediction issue for EPB (Earth Pressure Balance) shield chamber's Pressure field. Based on advance rate, rotating speed of the cutter head, screw conveyor speed, and the Earth Pressure measurements, four forecasting models are established for shield chamber Pressure points with the adaptive neuro-fuzzy(ANFIS) by minimizing deviation between the corresponding point's predicted Pressures and the settings. Then, use the genetic algorithm to get the optimal screw conveyor speed to control the Earth Pressure balance tunneling process. Simulation results show that the proposed prediction and the optimal control method give better performance with small tracking error and fast tracking speed.
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Optimal Earth Pressure balance control for shield tunneling based on LS-SVM and PSO
Automation in Construction, 2011Co-Authors: Xuanyu Liu, Cheng Shao, Renxi LiuAbstract:To avoid ground deformation in the process of Earth Pressure balance (EPB) shield tunneling, it is necessary to keep the Earth Pressure balance on excavation face. However, at present the Earth Pressure control depends mainly on operation experiences which is hysteretic and could result in slow response to the change of Earth Pressure. To solve these problem, a predictive control strategy for Earth Pressure balance during excavation is proposed in this paper, where an Earth Pressure prediction model taking advance speed and screw conveyor speed as the control parameters is established by means of least squares support vector machine (LS-SVM). Further, by minimizing the difference between the predicted Earth Pressure and the desired one, an optimization model of the control parameters is established, and solved by the particle swarm optimization (PSO) algorithm. Therefore, an optimal EPB control scheme for shield tunneling automatically is presented here. The simulation results demonstrate that the method presented in this paper is very effective to control Earth Pressure balance.
Junichi Koseki - One of the best experts on this subject based on the ideXlab platform.
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seismic Earth Pressure exerted on retaining walls under a large seismic load
Soils and Foundations, 2011Co-Authors: Kenji Watanabe, Junichi Koseki, Masaru TateyamaAbstract:ABSTRACT In recent years, serious damage has been done to retaining structures because of large Earthquakes. In order to establish practical methods for evaluating the seismic Earth Pressure, which is one of the important external forces acting on retaining structures during large Earthquakes, a series of shaking table tests was conducted on retaining wall (RW) models. The experiments revealed that the seismic active Earth Pressure was considerably smaller than that obtained by the Mononobe-Okabe theory, particularly under a large seismic load. Furthermore, it was demonstrated that the seismic Earth Pressure had an upper limit, which was determined by the force equilibrium of the soil wedge at the critical state when the RW lost its stability. On the basis of the test results, a new method to evaluate the seismic Earth Pressure for practical designs under a large seismic load has been suggested. This proposed method provides a reasonable Earth Pressure as well as an angle of failure plane, those of which depend on the seismic stability of the retaining wall. It has been confirmed that Earth Pressure obtained by the proposed method agrees well with the measured seismic Earth Pressure exerted on several retaining walls with different degrees of stability.
Zhang Che - One of the best experts on this subject based on the ideXlab platform.
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Analysis on the Replacement of the Active Earth Pressure Zone and Passive Earth Pressure Zone in the Foundation Pit Support
2005Co-Authors: Zhang CheAbstract:Taking an engineering of Taiyuan City as the example, and according to the actual foundation pit design, this paper expounds that the design value of the Earth Pressure in the foundation pit support is generally more than the actual value and the active Earth Pressure zone and the passive Earth Pressure zone around the support pile is variable, and points out that should distinguish the active Earth Pressure and passive Earth Pressure in actual engineering by using the displacement analysis, and then make the quantitative analysis on the stress of soil.
