Analysis on the Zoning and Initial Elastic Modulus of Main and Secondary Rock-Fill of CFRD Deformation

2011 ◽  
Vol 52-54 ◽  
pp. 601-605 ◽  
Author(s):  
Jian Mao ◽  
Zheng Zhong Wang ◽  
Quan Hong Liu ◽  
Xiao Kong Yu
Keyword(s):  
Elastic Modulus ◽  
Soft Rock ◽  
High Strength ◽  
Boundary Line ◽  
Elastic Model ◽  
Modulus Ratio ◽  
Rock Fill ◽  
Dam Deformation ◽  
Strength Rock ◽  
Nonlinear Elastic

Based on Duncan-zhang nonlinear elastic model and ANSYS software, impacts on the settlement and stress of dam as well as the panel deflection are studied with different modulus of dam embankment materials and zoning of rock-fill dams. Through a variety of comparisons, the result shows that the dam settlement and the maximum deflection of panels increase as the initial elastic modulus ratio of main to secondary rock-fill rising. The ratio was much more reasonable within 1 - 2 and the dam deformation was small; 0.3 times top of the dam filled with high strength rock-fill materials might decrease settlement and panel deflection. The boundary line could be put forward to upstream appropriately to improve the utilization of soft rock with modulus ratio of main to secondary rock-fill less than 1.5 times.

Mohr-Coulomb Model Considering Variation of Elastic Modulus and Its Application

2006 ◽  
Vol 306-308 ◽  
pp. 1445-1448 ◽  
Author(s):  
X.Z. Cui ◽  
Q. Jin ◽  
Q.S. Shang ◽  
S.T. Liu
Keyword(s):  
Elastic Modulus ◽  
Compressive Stress ◽  
Strain Curve ◽  
Material Strength ◽  
Elastic Model ◽  
Lagrangian Analysis ◽  
Stress Strain Curve ◽  
Modified Model ◽  
Coulomb Model ◽  
Nonlinear Elastic

Mohr-Coulomb model is a perfect elastoplastic model. It only considers the variation of material strength with lateral compressive stress, but doesn’t consider the variation of elastic modulus with lateral compressive stress and stress level and this is accordant with the true characteristic of geological material. The elasticity modulus in Mohr-Coulomb model was modified by employing the processing method of tangential modulus in Duncan-Chang nonlinear elastic model. In modified model, the stress-strain curve in elastic phrase behaves as hyperbola. In order to embed the modified model in FLAC3D program (Fast Lagrangian Analysis of Continua in 3 Dimensions), a preprocessing program was written and was employed to analyze numerically the bearing capacity of rigid piles loaded laterally.

scholarly journals Cytocompatibility of Ti–xZr alloys as dental implant materials

2021 ◽  
Vol 32 (5) ◽  
Author(s):  
Pinghua Ou ◽  
Cong Hao ◽  
Jue Liu ◽  
Rengui He ◽  
Baoqi Wang ◽  
...  
Keyword(s):  
Elastic Modulus ◽  
Pure Titanium ◽  
Dead Cell ◽  
Commercially Pure Titanium ◽  
Modulus Ratio ◽  
High Mechanical Strength ◽  
Commercially Pure ◽  
Low Elastic Modulus ◽  
Cell Assays ◽  
Osteogenic Induction

AbstractTi–xZr (x = 5, 15, 25, 35, 45% wt%) alloys with low elastic modulus and high mechanical strength were fabricated as a novel implant material. The biocompatibility of the Ti–xZr alloys was evaluated by osteoblast-like cell line (MG63) in terms of cytotoxicity, proliferation, adhesion, and osteogenic induction using CCK-8 and live/dead cell assays, electron microscopy, and real-time PCR. The Ti–xZr alloys were non-toxic and showed superior biomechanics compared to commercially pure titanium (cpTi). Ti–45Zr had the optimum strength/elastic modulus ratio and osteogenic activity, thus is a promising to used as dental implants.

Nonlinear elastic behaviors of low and high strength steels in unloading and reloading

2013 ◽  
Vol 562 ◽  
pp. 161-171 ◽  
Author(s):  
Hyunjin Kim ◽  
Chongmin Kim ◽  
Frédéric Barlat ◽  
Erik Pavlina ◽  
Myoung-Gyu Lee
Keyword(s):  
High Strength Steels ◽  
High Strength ◽  
Nonlinear Elastic

High Strength Combined Support Technology in Deep High Stress Soft Rock Roadway

2012 ◽  
Vol 524-527 ◽  
pp. 598-603
Author(s):  
Nian Jie Ma ◽  
Zhi Qiang Zhao ◽  
Hua Zhao ◽  
Li Shuai Jiang
Keyword(s):  
High Stress ◽  
Soft Rock ◽  
High Strength ◽  
Parameter Determination ◽  
Test Results ◽  
Actual Measurement ◽  
Computer Numerical Simulation ◽  
Soft Rock Roadway ◽  
Rock Roadway

In order to solve the serious damage and repeat revision problem of high stress soft rock roadway in deep -950 level of Tangshan coal mine, based on the theory of the maximum stress level, together with the actual measurement of geostress and the laboratory mechanical parameters of rock-core and computer numerical simulation, the high strength combined support technology and supporting parameters are determined and the engineering test has been done. The engineering test results show that the parameter determination of high strength combined support technology, which based on the actual measurement of geostress, can effective solve the support issue of high stress soft rock roadway and provide useful experience for similar engineering problems.

scholarly journals Analysis and approximation of a strain-limiting nonlinear elastic model

2014 ◽  
Vol 20 (1) ◽  
pp. 92-118 ◽  
Author(s):  
M Bulíček ◽  
J Málek ◽  
E Süli
Keyword(s):  
Elastic Model ◽  
Nonlinear Elastic

Stury of Post-Failure Constitutive Relation Based on SMP Criterion

2013 ◽  
Vol 790 ◽  
pp. 405-409
Author(s):  
Jian Ming Zhu ◽  
Ze Xiang Wu ◽  
Qi Zhao ◽  
Chong Yang
Keyword(s):  
Residual Stress ◽  
Elastic Modulus ◽  
Constitutive Model ◽  
Constitutive Relation ◽  
Strain Softening ◽  
Friction Angle ◽  
Peak Friction Angle ◽  
Confining Pressures ◽  
Intermediate Variables ◽  
Nonlinear Elastic

In this paper, based on SMP criteria, combination of strain softening of rock material mechanics theory, the after peak friction angleφfor the intermediate variables, the residual strainεto express the after peak nonlinear elastic modulusE, and finally establish a unified non-linear constitutive model of the rock peak residual stress. Combination Xiao Guanzhuang Eastern Mine typical breakdown rock of diorite triaxial test , get stress-strain curves for different confining pressures by this model. It shows that peak constitutive relation of this study can simulate the experimental results, prove the rationality of the model.

Performance Deterioration of High Strength Concrete under Mixed Erosion and Freeze-Thaw Cycling

2010 ◽  
Vol 163-167 ◽  
pp. 1655-1660
Author(s):  
Jian Zhang ◽  
Bo Diao ◽  
Xiao Ning Zheng ◽  
Yan Dong Li
Keyword(s):  
Compressive Strength ◽  
Elastic Modulus ◽  
Mass Loss ◽  
Modulus Of Elasticity ◽  
Dynamic Modulus ◽  
High Strength Concrete ◽  
High Strength ◽  
Freeze Thaw ◽  
Strength Concrete ◽  
Dynamic Modulus Of Elasticity

The mechanical properties of high strength concrete(HSC) were experimentally investigated under mixed erosion and freeze-thaw cycling according to ASTM C666(Procedure B), the erosion solution was mixed by weight of 3% sodium chloride and 5% sodium sulfate. The mass loss, relative dynamic modulus of elasticity, compressive strength, elastic modulus and other relative data were measured. The results showed that with the increasing number of freeze-thaw cycles, the surface scaled more seriously; the mass loss, compressive strength and elastic modulus continued to decrease; the relative dynamic modulus of elasticity increased slightly in the first 225 freeze-thaw cycles, then decreased in the following 75 cycles; the corresponding strain to peak stress decreased with the increase of freeze-thaw cycles. After 200 cycles, the rate of deterioration of concrete accelerated obviously.

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