Damage mechanism and constitutive model of surface paste disposal of a coal mine collapsed pit in a complicated environment

2021 ◽  
Vol 304 ◽  
pp. 124637
Author(s):  
Xueda Wei ◽  
Qi Sun
Keyword(s):  
Constitutive Model ◽  
Coal Mine ◽  
Damage Mechanism ◽  
Surface Paste Disposal

Damage Mechanism Research of Yushu Airport Road Landslide No.3 Base on Elastoplastic Damage Constitutive Model

2015 ◽  
Vol 744-746 ◽  
pp. 464-469
Author(s):  
Hong Gang Wu ◽  
Tao Yang ◽  
Xiao Yun Chen ◽  
Hui Min Ma ◽  
Hong Li Zhang ◽  
...  
Keyword(s):  
Constitutive Model ◽  
Damage Mechanism ◽  
Earthquake Triggering ◽  
Triggering Mechanism ◽  
Finite Element Program ◽  
Plastic Damage ◽  
Mechanism Research ◽  
Element Program ◽  
Damage Constitutive Model ◽  
Stability Of Slope

Due to the earthquake of Yushu in April 14, 2010, Airport Road landslide No.3 deformed cracking, resulting in lower stability of slope, triggering landslides and other diseases. Selecting the section 2-2 (mileage K823 + 809) of Airport Road landslide No.3 as the calculation section, we use the ABAQUS finite element program to establish landslide numerical mode. The slip mass of landslide was simulated by the elastic-plastic damage constitutive model, and the bedrock was analyzed as Mohr - Coulomb constitutive model. Landslide No3 is analyzed for example, and showed that earthquake triggering mechanism elastplastic damage constitutive model can describe the landslide very well.

Statistical Damage Constitutive Model for Concrete under Biaxial Tension

2013 ◽  
Vol 438-439 ◽  
pp. 183-186
Author(s):  
Wei Feng Bai ◽  
Jun Hong Zhang ◽  
Jun Feng Guan ◽  
Ying Cui
Keyword(s):  
Constitutive Model ◽  
Biaxial Tension ◽  
Damage Model ◽  
Damage Mechanism ◽  
Deformation Properties ◽  
Damage Constitutive Model ◽  
Strength And Deformation ◽  
Statistical Damage Constitutive Model ◽  
Damage Theory ◽  
Statistical Damage

Based on the statistical damage theory and the experimental phenomena, the statistical damage constitutive model for concrete under biaxial tension is proposed. The two meso-scale damage modes, rupture and yield are considered, and the whole damage evolution process is driven by the principal tensile damage strain. The results show that the proposed statistical damage model can accurately predict the constitutive behavior in the uniform damage phase for concrete under biaxial tension. The damage mechanism is discussed in the view point of biaxial strength and deformation properties.

scholarly journals A Multiparameter Damage Constitutive Model for Rock Based on Separation of Tension and Shear

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
YanHui Yuan ◽  
Ming Xiao
Keyword(s):  
Constitutive Model ◽  
Damage Model ◽  
Damage Mechanism ◽  
Internal Variable ◽  
Damage Variable ◽  
Tensor Form ◽  
Shear Damage ◽  
Damage Constitutive Model ◽  
Microscopic Damage ◽  
Elastoplastic Damage

By analysis of the microscopic damage mechanism of rock, a multiparameter elastoplastic damage constitutive model which considers damage mechanism of tension and shear is established. A revised general form of elastoplastic damage model containing damage internal variable of tensor form is derived by considering the hypothesis that damage strain is induced by the degeneration of elastic modulus. With decomposition of plastic strain introduced, the forms of tension damage variable and shear damage variable are derived, based on which effects of tension and shear damage on material’s stiffness and strength are considered simultaneously. Through the utilizing of Zienkiewicz-Pande criterion with tension limit, the specific form of the multiparameter damage model is derived. Numerical experiments show that the established model can simulate damage behavior of rock effectively.

scholarly journals Study on Damage Constitutive Model of High-Concentration Cemented Backfill in Coal Mine

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Baogui Yang ◽  
Haigang Yang
Keyword(s):  
Constitutive Model ◽  
Coal Mine ◽  
Damage Evolution ◽  
Triaxial Compression ◽  
Failure Process ◽  
Model Parameters ◽  
High Concentration ◽  
Deformation And Failure ◽  
Cemented Backfill ◽  
Damage Constitutive Model

In order to construct the damage constitutive model (DCM) of high-concentration cemented backfill (HCCB) in coal mine, the generalized Hoek-Brown strength criterion was used as the failure criterion. For the difference of theoretical derivation of constitutive relation, a new DCM based on residual strength was proposed. Combined with the conventional triaxial compression test, the correctness and rationality of the DCM were verified. The damage evolution characteristics of HCCB were analyzed, and the physical meaning of model parameters was clarified. The results show that (a) the theoretical curves of stress-strain relation are in good agreement with its experimental curves, which means DCM can simulate the deformation and failure process of HCCB. (b) The damage evolution curve of HCCB is S -shaped. To some extent, the confining pressure can inhibit the development of damage. (c) The parameter F 0 reflects the position of the peak point of the DCM, and parameter n is the slope of the straight line segment in the postpeak strain softening stage, which are, respectively, used to characterize the strength level and brittleness of HCCB. The establishment of DCM of HCCB is helpful to reveal its deformation and failure mechanism and provides theoretical basis for its strength design.

Damage Mechanism and Fracture Process of Concrete Gravity Dam under Earthquake Action

2012 ◽  
Vol 430-432 ◽  
pp. 142-145
Author(s):  
Jin Bao Liu ◽  
Jian Rong Xue ◽  
Wei Zhu
Keyword(s):  
Constitutive Model ◽  
Damage Mechanism ◽  
Maximum Tensile Stress ◽  
Transverse Component ◽  
Concrete Gravity Dam ◽  
Concrete Dam ◽  
Plastic Damage ◽  
Damage Constitutive Model ◽  
Earthquake Action ◽  
Degradation Effect

Based on plastic-damage constitutive model of concrete, the developing process of damage domains is simulated for the earthquake analysis of concrete dam by taking account of the change of strain speed and stiffness degradation effect caused by material damage. The plastic-damage constitutive model is applied and the dam-reservoir dynamic interaction resulting from the transverse component of ground motion is modeled using the developed and generalized Westergaard formula added mass technique. Numerical simulation results show that the damaged domains mainly distribute at the change in geometry of upper part of the dam and vertical construction joints. The damaged domains of dam are same as the maximum tensile stress because the tensile strength of concrete is less its compress strength.

Damage mechanism and dynamic constitutive model of frozen soil under uniaxial impact loading

2020 ◽  
Vol 140 ◽  
pp. 103217 ◽  
Author(s):  
Fulai Zhang ◽  
Zhiwu Zhu ◽  
Tiantian Fu ◽  
Jinxuan Jia
Keyword(s):  
Constitutive Model ◽  
Impact Loading ◽  
Damage Mechanism ◽  
Frozen Soil

Statistic Damage Constitutive Model of Loessial Soil Considering Damage Threshold

2012 ◽  
Vol 204-208 ◽  
pp. 370-375 ◽  
Author(s):  
Xing Xie ◽  
Dong Hong Wang ◽  
Fa Suo Zhao
Keyword(s):  
Constitutive Model ◽  
Shear Test ◽  
Damage Threshold ◽  
Damage Mechanism ◽  
Test Results ◽  
Loessial Soil ◽  
Calculation Results ◽  
Damage Constitutive Model ◽  
Statistical Damage Constitutive Model ◽  
Undrained Shear

The damage mechanism of loessial soils was studied by the statistical theory.Based on the characteristics strength of loessial soils micro-unit with Weibull distribution, and parameters that described by distribution variable of Drucker-Prager creterion are used, loessial soils damage constitutive model considering damage threshold is established to reflect the full process of loessial soils failure. Conventional triaxial consolidation undrained shear test results of loessial soils are taken as example to verify the model. By comparing theoretical calculation results with test results, it is showed that the statistical damage constitutive model considering damage threshold is reasonable.

The Numerical Experimental Investigation on Damage Zone of Surrounding Rock of Deep Tunnel Based on the Elastic-Plastic-Brittle Constitutive Model

2012 ◽  
Vol 204-208 ◽  
pp. 1454-1459
Author(s):  
Da Guo Wang ◽  
Jin Xi Miao ◽  
Qiang Li
Keyword(s):  
Constitutive Model ◽  
Present Model ◽  
Damage Zone ◽  
Ductile Failure ◽  
Damage Mechanism ◽  
Failure Criteria ◽  
Surrounding Rock ◽  
Deep Tunnel ◽  
Elastic Plastic ◽  
Whole Process

A particular elastic-plastic-brittle constitutive model, considering the heterogeneity of rock and the features of deep engineering, is presented, in which the multiple yield criteria based on stress space and ductile failure criteria based on strain space are adopted, and the numerical method is FEM. Through the simulation of the compression test of rock samples, the results show that the present model is rational and accurate. The elastoplastic damage mechanism of the surrounding rock mass of deep tunnel is studied and through the display of centralization, extension and transfer of stresses, it is shown that the present model can be used to predict reliably the whole process of formation of broken zone.

scholarly journals Study on Shale’s Dynamic Damage Constitutive Model Based on Statistical Distribution

2015 ◽  
Vol 2015 ◽  
pp. 1-8
Author(s):  
Jianjun Liu ◽  
Yuan Li ◽  
Huijuan Zhang
Keyword(s):  
Constitutive Model ◽  
Impact Load ◽  
Damage Mechanism ◽  
Test Results ◽  
Gas Reservoir ◽  
Laboratory Test Results ◽  
Damage Constitutive Model ◽  
Damage Theory ◽  
Fracture Damage ◽  
Dynamic Damage

The dynamic constitutive model of shale is basic for shale gas reservoir reforming. In order to investigate the dynamic mechanism of shale, a new dynamic damage constitutive model of shale under uniaxial impact load was established based on the statistical damage theory and the laboratory test results of deformation and the damage characteristics under the action of SHPB impact. Compared with the theoretical results, the model can describe shale’s mechanical attributes and reveal the fracture damage mechanism as well. The results will provide theoretical basis for hydraulic fracturing on shale and other dynamic reforming technics.

Sign in / Sign up

Export Citation Format

Share Document