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Elastic Foundation Beam Solution of Tensile Flexible Retaining Wall
Xu Jianqiang,Xu Jiangbo,Yang Xiaohua,Yan Zhaobai,Li Haiping,Wang Huoming,Tan Ling,Fei Dongyang,Li Jianguo,Luo Yongzhen 한국강구조학회 2022 International Journal of Steel Structures Vol.22 No.2
The application of fl exible retaining walls in foundation pit engineering is gradually increasing. At present, many practical engineering problems need to be solved. This article takes a corrugated steel retaining wall with tensile reinforcement, for example, assuming that it is an elastic foundation beam model. A typical vertical thin layer unit is taken on the retaining wall for analysis. It uses the waveform integration method to calculate the moment of inertia, deriving the diff erential equation of fl exural deformation of corrugated steel retaining wall and establishing the theoretical formula for deformation of corrugated steel retaining wall under fi lling pressure behind the wall. Finally, a FLAC3D model was established to simulate the deformation of corrugated steel retaining walls in practical engineering, and the fi nal numerical simulation results were consistent with the theoretical formula. Thus, providing a theoretical basis for the deformation of such fl exible retaining structures.
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Study on Anisotropic Characteristics of Dynamic Deformation Parameters of Phyllite
( Yilun Cui ),( Jiangbo Xu ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
The acoustic wave test was carried out by selecting the joints of the joint surface and the horizontal plane at 0°, 30°, 45°, 60°, 75°, and 90° phyllite samples. According to the corresponding waveform diagram, the starting point is selected, and the dynamic deformation parameters of thousands of rock samples under various angles are calculated. The results show that: (1) The anisotropy characteristics of the dynamic deformation parameters are obvious, and the influence of the variation of the joint surface inclination on the dynamic deformation parameters is achieved by affecting the wave impedance. (2) P-wave impedance and S-wave impedance have different effects on rock dynamic deformation parameters. Generally, P-wave and S-wave impedance should be considered comprehensively for the dynamic deformation parameters of rock samples. (3) Acoustic waves are in the elastic deformation law of the rock sample caused by the propagation in the rock sample is similar to the elastic deformation law caused by the external load acting on the rock sample.
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Jiang Xiao,Yuantao Chen,Jiangbo Xu 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
b-Cyclodextrin (CD) was grafted onto montmorillonite/iron oxides to prepare a novel magnetic CD/MMT/iron oxide composite by low-temperature plasma technology, and applied to remove U(VI) from aqueous solutions. The sorption irreversibility was attributed to inner-sphere binding of U(VI) on CD/MMT/iron oxide surface sites. The thermodynamic parameters indicated that the sorption of U(VI) on CD/MMT/iron oxide was an endothermic and spontaneous process. The maximum sorption capacity of U(VI) on CD/MMT/iron oxide was considerably higher than that of U(VI) on other reported materials. The CD/MMT/iron oxide can be potentially used as a cost-effective material for the purification of actual U(VI)-bearing effluents.
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Offline Inductance Identification of PMSM with Adaptive Inverter Nonlinearity Compensation
Gaolin Wang,Ying Wang,Jiangbo Qi,Ronggang Ni,Wei Chen,Dianguo Xu 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
Offline inductance identification of permanent magnet synchronous motor (PMSM) is essential for self-tuning of closed-loop controller and position observer in sensorless vector controlled drives. This paper proposes an enhanced offline identification method fulfilled at standstill with adaptive inverter nonlinearity compensation for general-purpose drive applications. The d-q axis inductances can be obtained at standstill by using a voltage-sourceinverter fed drive. Influences of inverter nonlinearities on direct and quadrature inductance identifications exploiting high frequency (HF) voltage injection at different rotor positions are analyzed. Then an adaptive inverter nonlinearity compensation strategy employing a simple self-learning of compensation coefficients is proposed to enhance the accuracy of inductance identification. The feasibility of the proposed adaptive offline inductance identification method is validated on a 22kW interior PMSM.
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( Weifeng Sun ),( Changgen Yan ),( Wei Xu ),( Jiangbo Xu ),( Han Bao ),( Yongli Xie ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
During the construction and operation period of highway cut slope, to evaluate the stability of the slope, it is of great necessity to monitor the responses of the slope and its reinforced structures. Compared with the traditional manual monitoring methods of slope, remote monitoring has become the development trend to obtain a timely feedback of potential hazards. This paper presents a case of highway cut slope based on remote monitoring of axial force of anchor and displacement, and the stability of the slope was evaluated. Reinforcement meters and deep displacement sensors were respectively used to monitor the axial forces of anchors and relative displacements of the slope in the In-situ test, and a network cloud platform was used to remotely manage the monitoring data. The results indicate that the axial forces of anchors varies slowly with the increasing of monitoring time within a limited range under the seasonal temperature change, and the displacements tends to be stable except in the winter, indicating the slope is stable and the monitoring is effective. For a highway cut slope with a long length, to remote monitoring the slope with an economical and effective way, it is suggested to install a small number of sensors on the sensitive positions.
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