Creep behavior of a soft rock in triaxial compression and shear conditions

2011 ◽  
pp. 205-210
Author(s):  
W Wang ◽  
T Liu ◽  
W Xu ◽  
Z Zhang ◽  
H Wang
Keyword(s):  
Creep Behavior ◽  
Triaxial Compression ◽  
Soft Rock

scholarly journals Mechanical Properties and Numerical Analyses of Basalt Fiber Crumb Rubber Mortars in Soft Rock Roadways

2019 ◽  
Vol 2019 ◽  
pp. 1-13 ◽  
Author(s):  
Jun-Ling Qin ◽  
Wei-Guo Qiao ◽  
Deng-Ge Lin ◽  
Shuai Zhang ◽  
Ji-Yao Wang
Keyword(s):  
Constitutive Model ◽  
Triaxial Compression ◽  
Basalt Fiber ◽  
Soft Rock ◽  
Crumb Rubber ◽  
Compression Tests ◽  
Confining Pressures ◽  
Roadway Support ◽  
Uniaxial Compressive Stress ◽  
Triaxial Compression Tests

The strength of crumb rubber mortars can be improved by the addition of basalt fibers. However, limited studies have been conducted on basalt fiber crumb rubber mortars (BF-CRM), and the constitutive model is still very immature. In this paper, uniaxial compressive stress-strain curves are obtained for several groups of BF-CRM specimens with different contents. By comparison with the GZH model, modified GZH parameters that can be used in a BF-CRM constitutive model are obtained. Then, taking the support scheme of the main substation of a mine as the background, FLAC3D is used to simulate the roadway support, BF-CRM replaces the ordinary mortars in the original support, and triaxial compression tests are performed at different confining pressures. In this way, the application of BF-CRM in roadway support is studied and analyzed.

scholarly journals Material Preparation and Geotechnical Properties of Transparent Cemented Soil for Physical Modeling

2021 ◽  
Vol 8 ◽  
Author(s):  
Xianlun Leng ◽  
Chuan Wang ◽  
Rong Pang ◽  
Qian Sheng ◽  
Jian Chen
Keyword(s):  
Shear Strength ◽  
Physical Modeling ◽  
Triaxial Compression ◽  
Soft Rock ◽  
Geotechnical Properties ◽  
Laboratory Model ◽  
Natural Soil ◽  
Empirical Formulas ◽  
Cemented Soil ◽  
Similar Materials

The preparation of transparent materials suitable for simulating different rock and soil masses is the foundation for image-based physical modeling tests in studying deformation and failure mechanisms in geotechnical media. A transparent cemented soil (TCS) with similar geotechnical properties of natural soil and soft rock was prepared using fused quartz as the skeleton, hydrophobic fumed silica powder as the cement and mixed mineral oil of 15# white oil and n-dodecane as the pore fluid. Eleven groups of TCS samples with different shear strengths were synthesized by adjusting the content or mass ratio of the cement and particle size or gradation of the skeleton. Contrasting tests of unconsolidated-undrained triaxial compression were carried out and the mechanical characteristics of TCS were analyzed, showing that the stress-strain relationship, shear strength and failure mode of TCS are similar to those of natural soil. The mechanical parameters of TCS undergo complex variation with the factors, and the mesoscopic mechanism of the changes therein was revealed with the help of optical microscope photos. The similarity ratio of TCS to soft rock was derived according to geometries and stress conditions of laboratory model tests, demonstrating the feasibility of using TCS as similar materials to soft rock. Moreover, empirical formulas for the change of shear strength parameters with the factors were fitted to facilitate the preparation of TCS with target shear strength in the future. The findings can provide a basis for preparing transparent similar materials to natural soil and soft rock in physical modeling tests.

scholarly journals Creep Behavior of Red-Clay Under Triaxial Compression Condition

2020 ◽  
Vol 7 ◽  
Author(s):  
Kaixi Xue ◽  
Shengfu Wang ◽  
Yanxiang Hu ◽  
Mingdong Li
Keyword(s):  
Creep Behavior ◽  
Triaxial Compression ◽  
Red Clay ◽  
Compression Condition

Experimental Study on Mechanical Properties of Jurassic Soft Rock in Shajihai Mining Area of Xinjiang

2013 ◽  
Vol 353-356 ◽  
pp. 20-23
Author(s):  
Xiao Lei Wang ◽  
Shun Xi Yan ◽  
Guang Can Zhang
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Compression Test ◽  
Mechanical Test ◽  
Triaxial Compression ◽  
Soft Rock ◽  
Mining Area ◽  
Surrounding Rock ◽  
Test Results ◽  
Support Design

According to the problemsof serious deformation of soft rock roadways and lack of system andcomprehensive study on surrounding rock characteristics and failure mechanismin Shajihai mining area, this paper carried out a series of mechanicalexperiments on the characteristics of surrounding rock in this area includinguniaxial compression test, triaxial compression test and water absorption propertiestest. Mechanical test results show that the compressive strength of surroundingrock of roadway is generally low, and mudstone compressive strength is thelargest which is 19.23 MPa, and compressive strength of the minimum is coalwhich is 11.32 MPa under natural condition. However sandstone and mudstone’sability of water absorbing is strong, and coal saturation strength issignificantly greater than that of mudstone and sandstone. Therefore, we shouldmake full use of the strength of coal in roadway layout and support design.

Thermodynamic Properties of Soft Sedimentary Rock in Geotechnical Engineering

2012 ◽  
Vol 170-173 ◽  
pp. 687-691 ◽  
Author(s):  
Jing Yin Wang ◽  
Fang Liu
Keyword(s):  
Thermodynamic Properties ◽  
Sedimentary Rock ◽  
Geotechnical Engineering ◽  
Triaxial Compression ◽  
Soft Rock ◽  
Compression Tests ◽  
Creep Tests ◽  
Oil Drilling ◽  
Viscoplastic Model ◽  
Conventional Triaxial Compression

In geotechnical engineering such as supporting of deep and soft rock roadway ,oil drilling , and construction of military underground defensive facility, thermodynamic properties of soft sedimentary rock has guiding significances .The study of the thermal constitutive behavior of rock under temperature has been done for many years, and many achievement have been got on this issue. In this paper, some experimental researches on the thermo-mechanical characteristics of soft sedimentary rock have been presented. Some test results have been simulated with a thermo-elasto-viscoplastic model. The results show that the proposed thermo-elasto-viscoplastic model reflects the visco-elastoplastic properties of rock，and can describe the thermo-mechanical behaviors of soft shale rocks in not only drained conventional triaxial compression tests but also drained triaxial creep tests. So it can be used for analysis of theology and stability of rock engineering.

scholarly journals Analysis and numerical calculation of a coupled creep and strain-softening model for soft rock tunnels

PLoS ONE ◽  
2021 ◽  
Vol 16 (8) ◽  
pp. e0256243
Author(s):  
Jianjun Zhang ◽  
Baicong Yao ◽  
Yunhe Ao ◽  
Chunzhe Jin ◽  
Chuang Sun
Keyword(s):  
Numerical Calculation ◽  
Stability Analysis ◽  
Plastic Zone ◽  
Creep Behavior ◽  
Strain Softening ◽  
Soft Rock ◽  
Support Design ◽  
Tunnel Support ◽  
Accelerated Creep ◽  
Rock Tunnels

Proper mechanical model selection is critical in tunnel support design and stability analysis, especially to reflect the creep and strain-softening behavior of soft rock. We present a coupled nonlinear Burgers strain-softening (NBSS) model and numerical calculation method to investigate the coupled effects of creep and strain-softening of soft rock tunnels. The nonlinear elastic-viscous model is used to simulate the steady creep behavior of mudstone, and the nonlinear viscoplastic strain-softening model is used to simulate the accelerated creep behavior and post-peak strength attenuation behavior. The experimental results show that the viscoplastic parameters and post-peak softening parameters of mudstone are highly sensitive to confining pressure and exhibit nonlinear characteristics. The accelerated creep curve obtained by the numerical calculation is consistent with the experiments, which verifies the model reliability. We use the NBSS and nonlinear Burgers Mohr-Coulomb (NBMC) models to calculate the plastic zone distribution characteristics and deformation law. The distribution of the plastic zone calculated by the NBSS model is larger with more localized fractures. The NBSS model is useful for studying the evolution of stress and displacement fields of complex surrounding rock mass, which provides important theoretical guidelines for the support design and stability analysis of soft rock tunnel engineering.

Test Study on Dynamic Deformation Behavior of Soft Rock-Concrete Sample under Cyclic Loading

2014 ◽  
Vol 501-504 ◽  
pp. 295-299 ◽  
Author(s):  
Zu De Ding ◽  
Yong Gang Du ◽  
Juan Huang ◽  
Cheng Hua Shi
Keyword(s):  
Dynamic Deformation ◽  
Dynamic Properties ◽  
Triaxial Compression ◽  
Soft Rock ◽  
Dynamic Strain ◽  
Compression Tests ◽  
Deformation Behaviors ◽  
Weak Interlayer ◽  
Good Contact ◽  
Dynamic Deformation Behavior

Considering three contact states of good contact, containing weak interlayer and water, containing weak interlayer but no water, a series of cyclic triaxial compression tests of soft rock-concrete samples for investigation the dynamic deformation behaviors are carried out. The influence of contact states on dynamic properties of combination samples is analyzed based on the dynamic stress-strain curves and accumulative strain curves. The results show that changing the contact states has notable effects on the dynamic strain of the samples. Comparing with the good contact sample, the accumulative strain of the sample containing weak interlayer is about 2 times. The amplitude of the sample vibration increases, while the accumulative strain reduces with the increase of the vibration frequency. It can be noted that the measures such as assuring construction quality, removing weak interlayer and water, keeping good contact state between bedrock and tunnel structure can reduce the settlements and improve the tunnel service life.

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