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A RECTANGULAR SHELL ELEMENT FORMULATION WITH A NEW MULTI-RESOLUTION ANALYSIS

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Acta Mechanica Solida Sinica 2014年第6期27卷 612-625页

作者： Yiming Xia Yuanxue Liu Shaolin Chen Gan Tang chongqing key laboratory of geomechanics and geoenvironmental protection Department of Civil Engineering Logistical Engineering University Civil Engineering Department Nanjing University of Aeronautics and Astronautics

A multi-resolution rectangular shell element with membrane-bending based on the Kirchhoff-Love theory is proposed. The multi-resolution analysis （MRA） framework is formulated out of a mutually nesting displacement subspace sequence, whose basis functions are constructed of scaling and shifting on the element domain of basic node shape functions. The basic node shape functions are constructed from shifting to other three quadrants around a specific node of a basic element in one quadrant and joining the corresponding node shape functions of four elements at the specific node. The MRA endows the proposed element with the resolution level （RL） to adjust the element node number, thus modulating structural analysis accuracy accordingly. The node shape functions of Kronecker delta property make the treatment of element boundary condition quite convenient and enable the stiffness matrix and the loading column vectors of the proposed element to be automatically acquired through quadraturing around nodes in RL adjusting. As a result, the traditional 4-node rectangular shell element is a mono-resolution one and also a special case of the proposed element. The accuracy of a structural analysis is actually determined by the RL, not by the mesh. The simplicity and clarity of node shape function formulation with the Kronecker delta property, and the rational MRA enable the proposed element method to be implemented more rationally, easily and efficiently than the conventional mono-resolution rectangular shell element method or other corresponding MRA methods.

关键词： rectangular shell element multi-resolution analysis (MRA) resolution level (RL),basic node shape function mutually nesting displacement subspace sequence scaling and shifting

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基于螺旋线三棱锥阵的三维匹配定位算法

Journal of Central South University 2021年第3期28卷 816-833页

作者：赵久彬刘元雪刘昌佳凌跃 chongqing key laboratory of geomechanics&geoenvironmental protection Department of Military InstallationsArmy Logistics University of PLAChongqing 401311China Beijing Institute of Special Electromechanical Technology Beijing 100020China

在滑坡泥石流等地质灾害发生前夕,灾害体内的岩石土块发生爆裂、摩擦和断裂等破坏会产生次声波信号,利用次声信号进行三维超前定位是地质灾害防治技术研究前沿。本文在柱坐标下将波动方程通过傅里叶变换和汉克尔变换,建立了三维轴对称... 详细信息

在滑坡泥石流等地质灾害发生前夕,灾害体内的岩石土块发生爆裂、摩擦和断裂等破坏会产生次声波信号,利用次声信号进行三维超前定位是地质灾害防治技术研究前沿。本文在柱坐标下将波动方程通过傅里叶变换和汉克尔变换,建立了三维轴对称的简正波地质声场模型;由于螺旋线三棱锥阵列的阵元具有垂直和水平采样能力,设计了4元螺旋线三棱锥阵置于声场中接收次声信号,提出地质灾害次声信号的简正波模型三维匹配定位方法。将该方法应用于岩土层中的次声信号定位分析,采用4元螺旋线三棱锥阵和与其他传统阵列进行定位应用对比,发现螺旋线三棱锥阵能够以较少数目阵元达到深度和距离的精确估计,且可能克服方位对称模糊性。基于螺旋线三棱锥阵的三维匹配定位方法为地质灾害防治技术研究提供了新思路。

关键词：地质灾害次声波螺旋线三棱锥阵三维匹配定位算法

Enzyme-Induced Carbonate Precipitation for the protection of Earthen Dikes and Embankments Under Surface Runoff: laboratory Investigations

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Journal of Ocean University of China 2022年第2期21卷 306-314页

作者： HE Jia FANG Changhang MAO Xunyu QI Yongshuai ZHOU Yundong KOU Hailei XIAO Liang key laboratory of Ministry of Education for geomechanics and Embankment Engineering Hohai UniversityNanjing 210098China College of Engineering Ocean University of ChinaQingdao 266100China Department of Finance and Audit Army Logistics UniversityChongqing 401331China

Earthen structures such as shore protection dikes and river embankments easily suffer from erosion under surface water *** study made experimental efforts to explore the enzyme-induced carbonate precipitation(EICP)method for slope erosion control under surface runoff for earthen *** sandy soils were treated by the EICP method for various *** characteristics were evaluated by the surface penetration resistance,calcium carbonate content,and surface hard crust thickness of EICP-treated *** runoff erosion experiments were carried out to evaluate the erosion control performances of the EICP *** surface penetration resistance,calcium carbonate content,and surface hard crust thickness were found to significantly increase with the treatment *** the erosion experiments,it was observed that the level of damages decreased and the water flow volume required to trigger the damage increased with more *** increase in the soil slope angle led to more serious surface *** amount and rate that the soil particles were eroded from the slope surfaces declined with more EICP treatments,which was consistent with those of visual *** preliminary investigations presented in this study have shown the potential of the EICP method for slope erosion control under surface runoff for earthen structures.

关键词： enzyme-induced carbonate precipitation urease erosion soil slope

New technology for the slope seismic design-the embedded anti-slide pile

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New technology for the slope seismic design-the embedded ant...