scholarly journals Triaxial Permeability Experimental Study on Deformation and Failure Processes of Single-Fractured Rock Specimens

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Taoli Xiao ◽  
Mei Huang ◽  
Min Gao
Keyword(s):  
Compression Test ◽  
Failure Modes ◽  
Triaxial Compression ◽  
Testing Machine ◽  
Peak Stress ◽  
Triaxial Compression Test ◽  
Permeability Test ◽  
Deformation And Failure ◽  
Seepage Pressure ◽  
Conventional Triaxial Compression

A series of rock-like specimens with specific sizes and fracture inclinations was created in the laboratory. The different effects of seepage pressure on the deformation and failure characteristics between a conventional triaxial compression test and a triaxial permeability test were studied using a servo-controlled testing machine. Furthermore, the change in the permeability of single-fractured specimens was explored based on a triaxial permeability test. The results were as follows. Compared with those observed in the conventional triaxial compression test, the peak stress and corresponding axial strain decrease under seepage pressure in the triaxial permeability test, while the deformation modulus increased. With the increase of fracture length, the peak stress of specimen decreases due to the seepage pressure and the specimen showed tensile failure horizontally. The failure mode of the single-fractured specimens was changed by the seepage pressure. A closed relationship was observed between the failure modes and the permeability-stress curves. A shear failure along the crack surface will occur when the permeability abruptly changed later than the peak stress point. The dramatic change in the permeability indicated that the permeability channel was extended or new seepage paths were created. These conclusions can provide a valuable theoretical reference for the numerical simulation of excavation and design in stability analysis of jointed rock masses.

Experimental Studying on Rock of HeLanKou Deformation and Failure Characteristics under Triaxial Compression Test

2014 ◽  
Vol 1065-1069 ◽  
pp. 40-43
Author(s):  
You Zhen Yang ◽  
Zi Fan Guo ◽  
Han Lin Ma
Keyword(s):  
Failure Analysis ◽  
Compression Test ◽  
Brittle Material ◽  
Compression Strength ◽  
Triaxial Compression ◽  
Triaxial Compression Test ◽  
Failure Characteristics ◽  
Deformation And Failure ◽  
Water Imbibition ◽  
Rock Paintings

The deformation and failure characteristics of rock have a decisive influence on the value of the heritage itself. Therefore, the rock samples were taken from the HeLanKou rock paintings area. The triaxial compression test was completed with the multi-function apparatus RMT-150C. Then the deformation and failure analysis were analyzed. The results show that the porosity and water imbibition are all low. The triaxial compression strength is high. The rock belongs to brittle material. The results can provide data support and reference for HeLanKou rock paintings protection.

scholarly journals Strength behavior of plain cement concrete subjected to true triaxial compression

2018 ◽  
Vol 45 (3) ◽  
pp. 179-196 ◽  
Author(s):  
Saurav Rukhaiyar ◽  
Gaurav Sajwan ◽  
Narendra Kumar Samadhiya
Keyword(s):  
Compression Test ◽  
Triaxial Compression ◽  
Testing Machine ◽  
Failure Criteria ◽  
Triaxial Compression Test ◽  
Cement Concrete ◽  
Principal Stresses ◽  
True Triaxial ◽  
Strength Concrete ◽  
True Triaxial Compression

True triaxial compression test was conducted on 100 mm × 100 mm × 100 mm cubical sample of plain cement concrete using the true triaxial testing machine. A total of 30 tests were conducted on two concrete mixes having characteristic strengths of 24.39 MPa and 34.67 MPa. The minor and intermediate principal stresses were varied from 2.5 MPa to 10 MPa and 2.5 MPa to 30 MPa respectively. The samples were loaded until failure under the stress rate of 1 MPa/min. The failure mode and direction of fracture planes were observed carefully. It was observed that the ratio of intermediate and minor principal stress had an incremental effect on the strength of the concrete. The results obtained from our experimental study as well as the true triaxial compression test data published in literature has been used to conduct a quantitative evaluation of three commonly used failure criteria presented for the concrete. The three failure criteria considered are Drucker-Prager (DP) criterion, Bresler-Pester (BP) criterion, and Hsieh-Ting-Chen (HTC) criterion. It was observed that for the normal strength concrete, the HTC criterion predicts the strength with least error while for the high strength concrete, the DP criterion gives better predictions. Overall the DP and BP criteria underestimate the strength while the HTC criterion overestimates.

An alternative to the conventional triaxial compression test

2006 ◽  
Vol 161 (3) ◽  
pp. 220-226 ◽  
Author(s):  
M.S. Nielsen ◽  
N. Bay ◽  
M. Eriksen ◽  
J.I. Bech ◽  
M.H. Hancock
Keyword(s):  
Compression Test ◽  
Triaxial Compression ◽  
Triaxial Compression Test ◽  
Conventional Triaxial Compression

Shearing characteristics of SCP-inserted clay specimens in triaxial compression test

2015 ◽  
Vol 11 (1) ◽  
pp. 209-219 ◽  
Author(s):  
Yoon-Sik Choo ◽  
Wanjei Cho ◽  
Choong-Ki Chung
Keyword(s):  
Compression Test ◽  
Triaxial Compression ◽  
Triaxial Compression Test

scholarly journals Numerical Analysis of the Anisotropy and Scale Effects on the Strength Characteristics of Defected Rockmass

2020 ◽  
Vol 2020 ◽  
pp. 1-21
Author(s):  
Xiabing Liu ◽  
Shaohui He ◽  
Dahai Wang
Keyword(s):  
Compression Test ◽  
Failure Modes ◽  
Scale Effects ◽  
Triaxial Compression ◽  
Influential Factor ◽  
Strength Characteristics ◽  
Uniaxial Compression Test ◽  
Mechanical Parameters ◽  
Strength Parameters ◽  
Strength Behavior

Discontinuous defect in the rockmass is a key influential factor in controlling the strength behavior, and how to estimate the anisotropic strength and scale effect on the defected rockmass is the remaining challenging focus in engineering application. In the present study, intact tuff samples cored from the Xiabeishan tunnel engineering in situ are conducted by experiment tests (i.e., uniaxial compression test, triaxial compression test, and Brazilian tensile test) to obtain the corresponding mechanical parameters. Results from the numerical simulations using the particle flow code (PFC) by the flat-jointed model (FJM) are performed to match the macroparameters from experimental results. It is observed that numerical results have good agreement with the macroscopic mechanical parameters of intact samples including UCS, BTS, triaxial compression strength, and corresponding deformation parameters. Finally, a series of uniaxial and confining compression tests are conducted by using a synthetic rockmass (SRM) method which is coupled with the discrete element method (DEM) and discrete fracture network (DFN). Then, the anisotropy and scale effects on the strength characteristics of the defected rockmass are investigated. The results show that defects have a vital effect on the failure mode and strength behavior of the rockmass in the research region. The strength parameters are changed with the specimen size. The REV size of the considered defected rockmass is regarded as 5 × 10 m, and this size is also influenced by the confinement level. The anisotropy of macroscopic strength parameters is found in the considered defected rockmass, whose stress-strain curves and failure modes are also discussed.

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