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The material point method (MPM) adopts the dual description of Lagrangian particles and Euler grids, so it can deal with large deformation and contact problems conveniently. The large deformation problem of thin shell structures was analyzed based on the framework of the convected particle domain interpolation material point method (CPDIMPM) . The quadrilateral mesh was used to discretize the shell structure. The basis function was calculated by the double mapping from the material point to the shell element node and then to the background grid node. The momentum equation was solved on the background grid, and the internal force of the material point was updated based on the Belytschko-Tsay (BT) shell element theory. In the numerical example, the comparison of large deformations of the shell structure with reference solutions verifies the accuracy of the proposed method. [ABSTRACT FROM AUTHOR]

Copyright of Chinese Journal of Computational Mechanics / Jisuan Lixue Xuebao is the property of Chinese Journal of Computational Mechanics Editorial Office, Dalian University of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In order to solve the problems of seepage deformation and ground settlement that might be caused by foundation pit dewatering of binary structure strong permeable stratum, Xixiayuan Water Conservancy and Irrigation Area Project head inverted siphon section excavation pit precipitation project was taken as the research object, and on-site slug test and indoor test were carried out. Meanwhile, the hydrogeological parameters of the research area were obtained by combining with survey data. Two precipitation schemes based on open channel drainage and the combination of open channel drainage and anti-seepage curtain were proposed for the study area with strong permeable strata with binary structure, and the numerical simulation based on Drain data packet in GMS was carried out, and the safety of foundation pit seepage deformation under different schemes was checked. The dam settlement safety of Xixiayuan Water Control Project adjacent to the northwest was analyzed and studied. The research results show that the two dewatering schemes will not cause seepage deformation and ground settlement damage, and the scheme of combining open channel drainage and anti-seepage curtain is more suitable for dewatering of foundation pit in the binary structure stratum with strong permeability and closely related to river hydraulics. [ABSTRACT FROM AUTHOR]

Copyright of Chinese Journal of Computational Mechanics / Jisuan Lixue Xuebao is the property of Chinese Journal of Computational Mechanics Editorial Office, Dalian University of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)