Variation for Soil Stress on CPTU Model Test

2010 ◽  
Vol 44-47 ◽  
pp. 2597-2601
Author(s):  
Yan Chun Tang ◽  
Gao Tou Meng
Keyword(s):  
Stress Field ◽  
Maximum Stress ◽  
Clay Soil ◽  
Cell Layer ◽  
Compression Stress ◽  
Soil Pressure ◽  
Piezocone Penetration Test ◽  
Main Stress ◽  
Saturated Clay ◽  
Soil Stress

Through a series of Piezocone Penetration Test (CPTU) model tests with saturated clay soil, by CPTU probe penetrating soil stress measured by soil pressure mini-cells embedded into soil has been acquired, the variation rules of soil stress by penetrating has been analyzed, the results show that with probe close to the second cell layer, the stress measured by the cells has been increased rapidly; when probe has arrived at the position of the second cell layer, the maximum stress value has been attained; and with probe away from the second cell layer, the stress value has been decreased rapidly. Based on the achieved soil stress value, the axial and radial subsidiary stress field causing by penetrating has been acquired, the conclusions can be obtained that the main stress style of the axial subsidiary stress is compression stress, around the probe the highest stress field has been occurred; the stress style of the radial subsidiary stress is compression stress, this phenomenon shows that by penetrating the compaction effect of the soil around the probe has been created; during the course of penetrating, the radial subsidiary stress is less than the axial subsidiary stress obviously. The achieved result can provide a foundation for further study for CPTU mechanism.

Study on Variation Rule of Pore Pressure on CPTU Model Test

2010 ◽  
Vol 160-162 ◽  
pp. 544-549
Author(s):  
Yan Chun Tang ◽  
Gao Tou Meng
Keyword(s):  
Pore Pressure ◽  
Clay Soil ◽  
Excess Pore Pressure ◽  
Horizontal Distance ◽  
Penetration Test ◽  
Piezocone Penetration Test ◽  
Saturated Clay ◽  
Short Time ◽  
Variation Rule ◽  
Excess Pore

Through a series of Piezocone Penetration Test (CPTU) model tests with saturated clay soil, excess pore pressure produced by CPTU penetrating and dissipating has been measured by CPTU probe and pore pressure mini-transducers, the variation rules of excess pore pressure has been analyzed, the results show that at the same transducers layer, the value of initial excess pore pressure at the probe is biggest, and with the horizontal distance from probe increasing, the value of initial excess pore pressure measured by transducers around the probe has been decreased quickly; at the same dissipating process, the value of initial excess pore pressure measured by transducers locating in the same horizontal plane with probe is bigger than the value by transducers of the other layer; difference between the variation rule of excess pore pressure dissipation measured by CPTU probe and pore pressure mini-transducers is that after the value of excess pore pressure is maximum, with the dissipating time increasing, the value of excess pore pressure measured by probe decreased rapidly, but at first the value of excess pore pressure measured by transducers decreased slowly and then after a short time decreased rapidly; the time of 90% of the maximum of excess pore pressure dissipating measured by CPTU probe is longer than the time of 90% of the maximum of excess pore pressure dissipating measured by transducers; at the same transducers layer, with horizontal distance from the probe increasing, the time of 90% of the maximum of excess pore pressure dissipating decreased. The achieved result can provide a foundation for further study for CPTU mechanism.

Numerical Simulation of Pile-Bucket Foundation under Horizontal Load

2012 ◽  
Vol 460 ◽  
pp. 169-174
Author(s):  
Wen Bai Liu ◽  
Liang Yang ◽  
Chen Xia Zhu
Keyword(s):  
Failure Surface ◽  
Horizontal Load ◽  
Soil Pressure ◽  
Passive Region ◽  
Deep Soil ◽  
Maximum Displacement ◽  
Bucket Foundation ◽  
Load Line ◽  
Soil Stress ◽  
Pressure Changes

The pile-bucket foundation is a new kind of foundation. In this paper, the ABAQUS software was used to analyze the soil displacement field and the soil stress field surrounding of the pile-bucket foundation under the multi-cycle horizontal loading. Under the horizontal load, the active area of soil separated from the basics; the passive region takes the shape of a parabolic ring of soil wedge rotate failure surface. The maximum displacement was in the direction of horizontal load line on the surface of soil near the bucket. Horizontal and vertical soil pressure changes are concentrated under the surface of the soil near the bucket, and the maximum horizontal soil stress was in the deep soil around the bucket. There is a point of inflection between 1/3 and 1/2 of the pile into soil , and the soil pressure that upper and lower the point increased in the opposite direction. The horizontal forced resistance of the foundation mainly distributed under the bucket and 1/2 of the pile into soil .The conclusion could provide a reference basis for the analysis of bearing mechanism and destruction characters of pile-bucket foundation

scholarly journals The Research on a Confined Modeling Method of the Effect of Deformable Ground Soil and Crawler Board

2018 ◽  
Vol 237 ◽  
pp. 02011
Author(s):  
LV Wei ◽  
Zhong-xin LI ◽  
LOU Peng
Keyword(s):  
Maximum Stress ◽  
Ground Deformation ◽  
Soil Mechanics ◽  
Soil Surface ◽  
Physical Significance ◽  
Soil Parameters ◽  
Soil Test ◽  
Analysis Model ◽  
Soil Pressure ◽  
Vehicle Mobility

There is a great relationship between the passing capacity of vehicles on the ground deformation road and the properties of confined and shear of ground soil, so it is necessary to establish a model that can reflect the soil pressure of the deformation. Physical significance of classic soil pressure experience parameters model is indeterminate, it was generally obtained by a lot of specific soil test. In this paper a new analysis model was built though introducing the maximum stress value of the crawler board and soil surface on basis of a kind of existing analysis model. This model reveals the relations among the confined characteristics of soil, soil parameters and the geometry of confined crawler board. These soil parameters can be obtained through the conventional soil mechanics test without a large number of specific soil test. Through the contrast experiment and predictions results, this model can effectively predict the sinkage of ground soil under the load, and provide a theory basis for the prediction of vehicle mobility.

scholarly journals Influence of cantilever position and implant connection in a zirconia custom implant-supported fixed partial prosthesis: in silico analysis

2018 ◽  
Vol 47 (4) ◽  
pp. 223-229
Author(s):  
Juliana Maria Coutinho BASTOS ◽  
Dimorvan BORDIN ◽  
Andréa Araújo de VASCONCELLOS ◽  
Milton Edson MIRANDA
Keyword(s):  
In Silico ◽  
Maximum Stress ◽  
In Silico Analysis ◽  
Compression Stress ◽  
Vertical Load ◽  
Occlusal Force ◽  
Tension Distribution ◽  
Custom Implant ◽  
In Silico Study ◽  
Silico Analysis

Abstract Introduction A better tension distribution on implants and abutments in implant-supported fixed partial prosthesis is essential in the rehabilitation of posterior mandible area. Objective: To evaluate the influence of cantilever position and implant connection in a zircônia custom implant-supported fixed partial prosthesis using the 3-D finite element method. Material and method: Four models were made based on tomographic slices of the posterior mandible with a zirconia custom three-fixed screw-retained partial prosthesis. The investigated factors of the in silico study were: cantilever position (mesial or distal) and implant connection (external hexagon or morse taper). 100 N vertical load to premolar and 300 N to molar were used to simulate the occlusal force in each model to evaluate the distribution of stresses in implants, abutments, screws and cortical and cancellous bone. Result: The external hexagon (EH) connection showed higher cortical compression stress when compared to the morse taper (MT). For both connections, the molar cantilever position had the highest cortical compression. The maximum stress peak concentration was located at the cervical bone in contact with the threads of the first implant. The prosthetic and abutment screws associated with the molar cantilevers showed the highest stress concentration, especially with the EH connection. Conclusion: Morse taper implant connetions associated with a mesial cantilever showed a more favorable treatment option for posterior mandible rehabilitation.

Study of Infiltration into Partially Saturated Clay Soil Railway Embankment

2017 ◽  
pp. 477-495
Author(s):  
Taifeng Li ◽  
Qianli Zhang ◽  
Degou Cai ◽  
Jianping Yao ◽  
Feng Chen
Keyword(s):  
Clay Soil ◽  
Partially Saturated ◽  
Saturated Clay

ENPOWER: Investigations by Neutron Diffraction and Finite Element Analyses on Residual Stress Formation in Repair Welds Applied to Ferritic Steel Plates

2005 ◽  
Author(s):  
Carsten Ohms ◽  
Robert C. Wimpory ◽  
Dimitar Neov ◽  
Didier Lawrjaniec ◽  
Anastasius G. Youtsos
Keyword(s):  
Experimental Data ◽  
Residual Stress ◽  
Numerical Analysis ◽  
Neutron Diffraction ◽  
Stress Field ◽  
Ferritic Steel ◽  
Maximum Stress ◽  
Steel Plates ◽  
Residual Stress Field ◽  
Welding Procedure

The European collaborative research project ENPOWER (Management of Nuclear Plant Operation by Optimizing Weld Repairs) has as one of its main objectives the development of guidelines for the application of repair welds to safety critical components in nuclear power plants. In this context letter box repair welds applied to thin ferritic steel plates to simulate repair of postulated shallow cracks have been manufactured for the purpose of experimental and numerical analysis of welding residual stresses. Two specimens have been procured, one of them prepared in accordance with a standard welding procedure, while in the second case a different procedure was followed in order to obtain extended martensite formation in the heat affected zone. Residual stresses have been determined in both specimens by neutron diffraction at the High Flux Reactor of the Joint Research Centre in Petten, The Netherlands. In parallel Institut de Soudure in France has performed a full 3-d analysis of the residual stress field for the standard welding case taking into account the materials and phase transformations. The experimental data obtained for both specimens clearly suggest that the non-conventional welding procedure rendered higher maximum stress values. In the case of the standard welding procedure numerical and experimental data show a reasonable qualitative agreement. The maximum stress value was in both cases found in the same region of the material — in the base metal just underneath the weld pool — and in both cases found to be of similar magnitude (∼800 MPa found in neutron diffraction and ∼700 MPa found in numerical analysis). In this paper the experimental and numerical approaches are outlined and the obtained results are presented. In addition an outlook is given to future work to be performed on this part of the ENPOWER project. A main issue pending is the application of an optimized advanced post weld heat treatment in one of the two cases and the subsequent numerical and experimental determination of its impact on the residual stress field. At the same time further evaluation of the materials transformations due to welding is pursued.

Stress-Strain Characteristics of a Saturated Clay Soil at Various Rates of Strain

1970 ◽  
Vol 13 (5) ◽  
pp. 0685-0689 ◽  
Author(s):  
Awatif M. El-Domiaty ◽  
William J. Chancellor
Keyword(s):  
Clay Soil ◽  
Stress Strain ◽  
Saturated Clay

Simulation and Experiment of Mechanical Properties of Potato Compression

2013 ◽  
Vol 850-851 ◽  
pp. 1303-1306
Author(s):  
Wei Sun ◽  
Jian Ming Wu ◽  
Lin Rong Shi ◽  
Di Wang ◽  
Wu Yun Zhao ◽  
...  
Keyword(s):  
Maximum Stress ◽  
Element Model ◽  
Solid Model ◽  
Compression Stress ◽  
Rupture Force ◽  
Compression Force ◽  
Modeling Technology ◽  
Simulation And Experiment ◽  
Force Time ◽  
Z Curve

Potato sizes of the longshu 3, new daping and zhuangshu 3 proceed statistics, the typical value of potato size statistics is got. Application of section modeling technology gets the potato contour data, then the data imports into Solidworks software and generates Potato solid model, application of ANSYS/Ls-dyna software to carry on the research of potato with a certain rate in X, Y, Z three directions of loading stress. The results show that Potato X finite element model to compression stress was 1.27MPa, Y to the maximum stress is 5.84MPa; Z to the maximum stress is 3.9MPa. The tuber compression test finds that the 35mm/min rate in three different loading directions on potato compression force-time curves are different, Y curve is higher than that of X and Z direction, Z curve is higher than the Z, the rupture force Z is more than X and Y direction, X is higher than Y direction, the simulation curves are basically identical to experimental curves.

scholarly journals INFLUENCE OF ACTIVE SURFACE MATERIALS FOR SHEAR STRENGTH OF CLAY SOIL / PAVIRŠIAUS AKTYVIŲJŲ MEDŽIAGŲ ĮTAKA MOLINIŲ GRUNTŲ KERPAMAJAM STIPRIUI

2011 ◽  
Vol 3 (2) ◽  
pp. 71-75
Author(s):  
Saulius Malūnavičius
Keyword(s):  
Shear Strength ◽  
Clay Soil ◽  
Active Surface ◽  
Soil Pressure ◽  
Angle Of Internal Friction ◽  
Material Substance ◽  
Soil Shear Strength ◽  
Surface Materials ◽  
Base Strength ◽  
Calcium Compounds

The article deals with the active surface materials (ASM) on the clay soil shear strength parameters, which are used in calculating the building base strength and stability of soil pressure in to supporting surface and slope stability. From the known mineral composition of clay soil was partially removed calcium compounds and were polluted of different concentration of pollutants and the values were compared. The analysis of active surface material substance influence on clay soil shows that higher concetration of pollutants in solution results in decreased soil cohesion, where the angle of internal friction remains various values.

Sign in / Sign up

Export Citation Format

Share Document