A large strain theory for the two dimensional problems in geomechanics

1986 ◽  
Vol 10 (1) ◽  
pp. 17-39 ◽  
Author(s):  
Panagiotis D. Kiousis ◽  
George Z. Voyiadjis ◽  
Mehmet T. Tumay
Keyword(s):  
Large Strain ◽  
Strain Theory ◽  
Two Dimensional

Large-strain consolidation analysis of PVD-installed soft soil considering the discharge capacity variation according to depth and time

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Ba-Phu Nguyen ◽  
Ananta Man Singh Pradhan ◽  
Tan Hung Nguyen ◽  
Nhat-Phi Doan ◽  
Van-Quang Nguyen ◽  
...  
Keyword(s):  
Numerical Solution ◽  
Discharge Capacity ◽  
Large Strain ◽  
Soft Soil ◽  
Monitoring Data ◽  
Two Dimensional ◽  
Content Type ◽  
Prefabricated Vertical Drain ◽  
Consolidation Rate ◽  
Consolidation Behavior

Purpose The consolidation behavior of prefabricated vertical drain (PVD)-installed soft deposits mainly depends on the PVD performance. The purpose of this study is to propose a numerical solution for the consolidation of PVD-installed soft soil using the large-strain theory, in which the reduction of discharge capacity of PVD according to depth and time is simultaneously considered. Design/methodology/approach The proposed solution also takes into account the general constitute relationship of soft soil. Subsequently, the proposed solution is applied to analyze and compare with the monitoring data of two cases, one is the experimental test and another is the test embankment in Saga airport. Findings The results show that the reduction of PVD discharge capacity according to depth and time increased the duration required to achieve a certain degree of consolidation. The consolidation rate is more sensitive to the reduction of PVD discharge capacity according to time than that according to the depth. The effects of the reduction of PVD discharge capacity according to depth are more evident when PVD discharge capacity decreases. The predicted results using the proposed numerical solution were validated well with the monitoring data for both cases in verification. Research limitations/implications In this study, the variation of PVD discharge capacity is only considered in one-dimensional consolidation. However, it is challenging to implement a general expression for discharge capacity variation according to time in the two-dimensional numerical solution (two-dimensional plane strain model). This is the motivation for further study. Practical implications A geotechnical engineer could use the proposed numerical solution to predict the consolidation behavior of the drainage-improved soft deposit considering the PVD discharge capacity variation. Originality/value The large-strain consolidation of PVD-installed soft deposits could be predicted well by using the proposed numerical solution considering the PVD discharge capacity variations according to depth and time.

scholarly journals Growth and Properties of Dislocated Two-dimensional Layered Materials

MRS Advances ◽  
2020 ◽  
Vol 5 (64) ◽  
pp. 3437-3452
Author(s):  
Rui Chen ◽  
Jinhua Cao ◽  
Stephen Gee ◽  
Yin Liu ◽  
Jie Yao
Keyword(s):  
Catalytic Properties ◽  
Large Strain ◽  
Layered Materials ◽  
Research Field ◽  
Two Dimensional ◽  
Research Attention ◽  
Stacking Order ◽  
2D Layered Materials ◽  
Considerable Research ◽  
Local Modification

AbstractTwo-dimensional (2D) layered materials hosting dislocations have attracted considerable research attention in recent years. In particular, screw dislocations can result in a spiral topology and an interlayer twist in the layered materials, significantly impacting the stacking order and symmetry of the layers. Moreover, the dislocations with large strain and heavily distorted atomic registry can result in a local modification of the structures around the dislocation. The dislocations thus provide a useful route to engineering optical, electrical, thermal, mechanical and catalytic properties of the 2D layered materials, which show great potential to bring new functionalities. This article presents a comprehensive review of the experimental and theoretical progress on the growth and properties of the dislocated 2D layered materials. It also offers an outlook on the future works in this promising research field.

Charge doping induced reversible multistep structural phase transitions and electromechanical actuation in two-dimensional 1T′-MoS2

Nanoscale ◽  
2020 ◽  
Vol 12 (23) ◽  
pp. 12541-12550 ◽  
Author(s):  
Kaiyun Chen ◽  
Junkai Deng ◽  
Qian Shi ◽  
Xiangdong Ding ◽  
Jun Sun ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Charge Density Wave ◽  
Large Strain ◽  
Structural Phase ◽  
Density Wave ◽  
Two Dimensional ◽  
Structural Phase Transitions ◽  
Wave State ◽  
Charge Doping ◽  
Electromechanical Actuation

Charge doping could effectively modulate the charge density wave state of monolayer MoS2 with large strain output and superelasticity.

scholarly journals Delayed Drainage of a Largely Deformed Aquitard due to Abrupt Water Head Decline in Adjacent Aquifer

Geofluids ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Zhaofeng Li ◽  
Zhifang Zhou ◽  
Mingyuan Li ◽  
Boran Zhang ◽  
Beibing Dai
Keyword(s):  
Analytical Solution ◽  
Large Strain ◽  
Small Strain ◽  
Strain Theory ◽  
Water Drainage ◽  
Water Release ◽  
Hydrogeological Parameters ◽  
Water Head ◽  
Curve Fitting Method ◽  
The One

A governing equation of drawdown was put forward to describe the one-dimensional large-strain consolidation behavior of an aquitard without consideration of the creeping effect. An analytical solution was derived to characterize the drawdown variation in the aquitard subjected to sudden hydraulic head decline in adjacent confined aquifer. The characteristics of the groundwater dynamics and water balance in the aquitard have been analyzed based on the analytical solution. A comparison analysis of results has been made between the large-strain theory and the classical small-strain theory. The type-curve fitting method was used to determine the hydrogeological parameters, on the basis of the observed variations of aquitard deformation with time. The analytical solution was thus validated by a comparison with the observed experimental results. It is found that the water drainage of aquitard is obviously delayed in response to the water head decline in the adjacent aquifer. All delayed water release from the aquitard terminates when the consolidation time reaches the value of l2/cv0. The aquitard deformation predicted by the large-strain theory is less than that given by the small-strain theory, and the prediction discrepancy of these two theories increases with the increasing soil compressibility.

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