Implementation of DSC model and application for analysis of field pile tests under cyclic loading     

Changming Shao  Chandra S. Desai 《国际地质力学数值与分析法杂志》2000,24(6):601-624

The disturbed state concept (DSC) model, and a new and simplified procedure for unloading and reloading behavior are implemented in a nonlinear finite element procedure for dynamic analysis for coupled response of saturated porous materials. The DSC model is used to characterize the cyclic behavior of saturated clays and clay–steel interfaces. In the DSC, the relative intact (RI) behavior is characterized by using the hierarchical single surface (HISS) plasticity model; and the fully adjusted (FA) behavior is modeled by using the critical state concept. The DSC model is validated with respect to laboratory triaxial tests for clay and shear tests for clay‐steel interfaces. The computer procedure is used to predict field behavior of an instrumented pile subjected to cyclic loading. The predictions provide very good correlation with the field data. They also yield improved results compared to those from a HISS model with anisotropic hardening, partly because the DSC model allows for degradation or softening and interface response. Copyright © 2000 John Wiley & Sons, Ltd.  相似文献   

Can a Fast-Mode EUV Wave Generate a Stationary Front?     

P. F. Chen  C. Fang  R. Chandra  A. K. Srivastava 《Solar physics》2016,291(11):3195-3206

  相似文献   

Suggestion for Search of Malononitrile (CH2(CN)2) in a Cosmic Object: Potential Spectral Lines     

Sharma  M. K.  Sharma  M.  Chandra  S. 《Astronomy Reports》2020,64(9):769-777

Astronomy Reports - Though accurate laboratory studies of malononitrile (CH2(CN)2), a dinitrile molecule, have been carried out from time to time, and it has large electric dipole moment $$\mu =...  相似文献   

Comments on the heating of solar active regions by magnetic energy dissipation     

Suresh Chandra 《Astrophysics and Space Science》1986,123(2):403-404

The method of Kumar and Narain (1985) to calculate the twisting velocity of magnetic field appears to be erroneous. Hence, their conclusion about Tucker's proposal for the heating of active regions by magnetic energy dissipation may not be correct.  相似文献   

Trapezoidal footings on non-linear subgrades     

S. Chandra  M. R. Madhav  N. G. R. Iyengar 《国际地质力学数值与分析法杂志》1984,8(6):519-529

The pressure versus settlement response is highly non-linear for soils, in general. In the present study, a cubic equation of the type p = K₁w ? K₂w³ is suggested to incorporate the non-linear behaviour. A trapezoidal footing with constant depth resting on a subgrade having non-linear response is analysed. The resulting fourth order non-linear differential equation with variable coefficients is solved by using the Galerkin technique and beam characteristic functions are employed to obtain faster convergence. The results are presented in the form of non-dimensional charts for valid ranges of footings and soil parameters.  相似文献   

Solar coronal loop     

Suresh Chandra 《Astrophysics and Space Science》1985,113(1):193-194

The conclusions drawn by Narain (1983) appear to be in error.  相似文献   

In memoriam     

Chandra S. Desai 《国际地质力学数值与分析法杂志》1992,16(1):1-2

  相似文献   

Response of multilayer geosynthetic-reinforced bed resting on soft soil with stone columns   总被引：2，自引：0，他引：2  

Kousik Deb  Sarvesh Chandra  P.K. Basudhar   《Computers and Geotechnics》2008,35(3):323-330

In the present study, a mechanical model has been developed to study the behavior of multilayer geosynthetic-reinforced granular fill over stone column-reinforced soft soil. The granular fill and geosynthetic reinforcement layers have been idealized by Pasternak shear layer and rough elastic membranes, respectively. The Kelvin–Voight model has been used to represent the time-dependent behavior of saturated soft soil. The stone columns are idealized by stiffer springs and assumed to be linearly elastic. The nonlinear behavior of the soft soil and granular fill is considered. The effect of consolidation of soft soil due to inclusion of the stone columns on settlement response has also been included in the model. Plane strain conditions are considered for the loading and reinforced foundation soil system. An iterative finite difference scheme is applied for obtaining the solution and results are presented in nondimensional form. It has been observed that if the soft soil is improved with stone columns, the multilayer reinforcement system is less effective as compared to single layer reinforcement to reduce the total settlement as there is considerable reduction in the total settlement due to stone column itself. Multilayer reinforcement system is effective for reducing the total settlement when stone columns are not used. However, multilayer reinforcement system is effective to transfer the stress from soil to stone column. The differential settlement is also slightly reduced due to application of multiple geosynthetic layers as compared to the single layer reinforcement system.  相似文献   

Use of GIS in assessing building vulnerability for landslide hazard in The Nilgiris,Western Ghats,India   总被引：1，自引：0，他引：1  

Edison Thennavan  Ganapathy Pattukandan Ganapathy  S. S. Chandra Sekaran  Ajay S. Rajawat 《Natural Hazards》2016,80(2):1031-1056

  相似文献   

<Emphasis Type="Italic">Holigarna</Emphasis> (Anacardiaceae) from the early Eocene of Western India and its palaeogeographical and palaeoclimatological significance     

Anumeha Shukla  Rakesh Chandra Mehrotra 《Journal of the Geological Society of India》2016,87(5):520-524

Thick lignite deposits on the western margin of India were preserved on account of thick vegetation which got buried underneath due to tectonic activities that occurred in northwestern part of India during the early Palaeogene. Study of the fossil flora preserved in these beds is important to deduce the palaeoclimate of the region. Therefore, a field work was undertaken to collect plant fossils from the Tarkeshwar lignite mine, Surat district, Gujarat (western India) which is still unexplored as far as the plant mega-remains are concerned. A fossil wood is systematically described from the Cambay Shale Formation of the mine considered to be of early Eocene in age. It shows close affinities with Holigarna (Anacardiaceae), particularly with H. beddomei and H. grahamii. This genus is evergreen in nature and grows in the Indo-Malayan region, while both the modern analogues of the fossil are endemic to semi-evergreen to evergreen forests ofWestern Ghats, south India, located at the equator. This not only confirms the palaeolatitudinal position of the Indian subcontinent at the equator during the early Palaeogene, but also indicates the presence of equatorial rain forest in the Indian subcontinent during the period. Based on the timetree, Sapindales started to diverge in the early Palaeocene (62–57 Ma) as its oldest fossil is from the K-Pg boundary. Discovery of the present anacardiaceous fossil (belonging to Sapindales) from the early Eocene strengthens the above phylogenetic view.  相似文献