scholarly journals Laboratory Test and Numerical Simulation for Geotextile Bag with Sand Cofferdam of Immersed Tunnel

2019 ◽  
Vol 562 ◽  
pp. 012159
Author(s):  
Zegan He ◽  
Lixin Wei ◽  
Chunshan Yang ◽  
Junsheng Chen
Keyword(s):  
Numerical Simulation ◽  
Laboratory Test ◽  
Immersed Tunnel ◽  
Geotextile Bag

scholarly journals Experimental and Numerical Evaluation of Hydraulic Fracturing under High Temperature and Embedded Fractures in Large Concrete Samples

Water ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 3171
Author(s):  
Liangliang Guo ◽  
Zihong Wang ◽  
Yanjun Zhang ◽  
Zhichao Wang ◽  
Haiyang Jiang
Keyword(s):  
Numerical Simulation ◽  
High Temperature ◽  
Hydraulic Fracturing ◽  
Laboratory Test ◽  
High Temperatures ◽  
Large Scale ◽  
Hydraulic Fractures ◽  
Enhanced Geothermal Systems ◽  
Geothermal Systems ◽  
Fracture Density

In order to study the mechanism of hydraulic fracturing in enhanced geothermal systems, we analyzed the influence of high temperatures and embedded fractures on the initiation and propagation of hydraulic fractures using a laboratory test and numerical simulation. The analysis was conducted via large-scale true triaxial hydraulic fracturing tests with acoustic emission monitoring. Moreover, we discussed and established the elastic-plastic criterion of hydraulic fracturing initiation. The corresponding fracturing procedure was designed and embedded into the FLAC3D software. Then, a numerical simulation was conducted and compared with the laboratory test to verify the accuracy of the fracturing procedure. The influence of high temperatures on hydraulic fracturing presented the following features. First, multi-fractures were created, especially in the near-well region. Second, fracturing pressure, extension pressure, and fracture flow resistance became larger than those at room temperature. 3D acoustic fracturing emission results indicated that the influence of the spatial distribution pattern of embedded fractures on hydraulic fracturing direction was larger than that of triaxial stress. Furthermore, the fracturing and extension pressures decreased with the increase of embedded fracture density. For hydraulic fracturing in a high temperature reservoir, a plastic zone was generated near the borehole, and this zone increased as the injection pressure increased until the well wall failed.

Numerical simulation for large-scale seismic response analysis of immersed tunnel

2006 ◽  
Vol 28 (10) ◽  
pp. 1367-1377 ◽  
Author(s):  
Jun-Hong Ding ◽  
Xian-Long Jin ◽  
Yi-Zhi Guo ◽  
Gen-Guo Li
Keyword(s):  
Numerical Simulation ◽  
Seismic Response ◽  
Large Scale ◽  
Response Analysis ◽  
Seismic Response Analysis ◽  
Immersed Tunnel

Seasonal Soil Freezing Characters in Daxinganling

2013 ◽  
Vol 652-654 ◽  
pp. 1668-1672
Author(s):  
Lin Ding ◽  
Yan Jie Liu ◽  
Yi Mei Min
Keyword(s):  
Thermal Conductivity ◽  
Numerical Simulation ◽  
Moisture Content ◽  
Laboratory Test ◽  
Transition Function ◽  
Ground Temperature ◽  
Soil Freezing ◽  
Seasonal Freezing ◽  
Freezing Soil ◽  
Water Behavior

For understanding the transport of groundwater existing in the seasonal freezing soil，laboratory test and field monitoring (frozen depth、moisture content and ground temperature in five months) were carried out in Daxinganling. A translocation model is built to analyze water behavior. The result shows that thermal conductivity will increase approximately one percent when temperature decreases 1°C. A transition function is used to prevent non-convergence in the numerical simulation. The simulation proves that the modified numerical simulation can reveal the law of moisture and heat translocation, and further offer guidance in practice.

Numerical Simulation by DDA and the Fabrics Analysis of Two Dimensional Experiment on Coarse Granular Material

2012 ◽  
Vol 170-173 ◽  
pp. 3621-3629
Author(s):  
Pei Xi Guo ◽  
Shao Zhong Lin
Keyword(s):  
Numerical Simulation ◽  
Laboratory Test ◽  
Granular Material ◽  
Simulation Model ◽  
Mechanical Characteristics ◽  
Discontinuous Deformation Analysis ◽  
Deformation Analysis ◽  
Two Dimensional ◽  
Stress Strain ◽  
Discontinuous Deformation

DDA(Discontinuous Deformation Analysis) was used to study the mechanical characteristics of coarse granular material (CGM). The numerical simulation model was found consulting the two Dimensional test of CGM,and the stress-strain curves obtained by the numerical simulation were basically in agreement with the results of laboratory test. It indicates that the numerical simulation is suitable for the mechanical characteristic research of CGM. In addition,the distribution statistic of several fabric elements about interaction between particles was also presented. Some relation between the stress-strain and fabric element change are found after analysis.

Test and Numerical Simulation Study on Ice-Breaking of a Rubber Crumbs Asphalt Pavement

2014 ◽  
Vol 1065-1069 ◽  
pp. 721-724 ◽  
Author(s):  
Hong Wei Zhang ◽  
Ming Feng Chang ◽  
Chun Lei Xie ◽  
Zhen Zheng Liu
Keyword(s):  
Numerical Simulation ◽  
Laboratory Test ◽  
Discrete Element Method ◽  
Simulation Study ◽  
Strain Energy ◽  
Asphalt Pavement ◽  
Weighted Average ◽  
Contact Forces ◽  
Pavement Structure ◽  
Maximum Contact

A laboratory ice-breaking test was employed for an asphalt pavement with different dosage of rubber crumbs to study the ice-breaking effects by a self-developed road ice-breaking simulating tester. The mesoscopic model of rubber crumbs asphalt pavement structure with 2mm ice layer was established using the discrete element method, and the mesoscopic responses of rubber crumbs asphalt pavement structure were simulated under the standard axle loading. The results indicate that the weighted average rebound amounts of BPN with 3% rubber crumbs increase by 11.45% and 1.46%, respectively, compared with that of 2% and 4% rubber crumbs. The weighted average rebound rates of BPN with 3% rubber crumbs increase by 11.22% and 3.06%, respectively, compared with that of 2% and 4% rubber crumbs. For 3% rubber crumbs, the maximum contact forces in this pavement structure are the biggest which are 2.705×103N before loading and 2.706×103N after loading, and its strain energy is 1.34 times that of 2% rubber crumbs, 1.25 times that of 4% rubber crumbs. In addition, the results of numerical simulation are consistent with the results laboratory test.

Experimental and Numerical Simulation Study on the Shear Stress for the Interfaces of Anchorage Type Structures

2010 ◽  
Vol 163-167 ◽  
pp. 1325-1328
Author(s):  
Zhi Xiang Zha ◽  
Wei Peng ◽  
Xi La Liu
Keyword(s):  
Numerical Simulation ◽  
Shear Stress ◽  
Laboratory Test ◽  
Plane Strain ◽  
Simulation Study ◽  
Stress Transfer ◽  
Plane Strain Condition ◽  
Strain Condition ◽  
Working Mechanism ◽  
Pull Out

A laboratory test of anchor pull-out model under plane-strain condition on the shear stress transfer for the interfaces of anchorage type structures was carried out in this paper. The results of test were verified by corresponding numerical simulation model. It was proved that the pull-out experimental model under plane-strain condition was an effective model used to research the working mechanism of anchorage structure.

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