Mechanical behaviors of conjugate-flawed rocks subjected to coupled static–dynamic compression

Peng, Feng; Zhao, Jiachen; Dai, Feng; Wei, Mingdong; Liu, Bo

doi:10.1007/s11440-021-01322-6

Cited by 44 publications

(17 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…After fracture, the crossbedding continues to expand to the bottom until the sample cracks. The shale bedding surface and microcracks are formed, and these natural weak surfaces affect the failure results during the test, causing the crack surface to be destroyed along the direction of bedding and form multiple splitting failure, also known as crossconjugate seam [34,35].…”

Section: Effect Of Bedding On the Mechanical Properties Of Rocks Unde...mentioning

confidence: 99%

“…According to the characteristics of the stress-strain curve, the fracture and pore expansion are divided into three stages: initial, expansion, and penetration. Feng et al [34,35] analyzed failure modes of conjugate cracks under static and dynamic loads by using energy dissipation and fractal dimension and concluded that with the strain rate increase, the dynamic strength of rock significantly increased. Chen et al, Helstrup et al ,Zhen et al, demonstrated that drilling fluid immersion has a great influence on the mechanical properties of shale.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Mechanical Properties of Shale-Reservoir Rocks Based on Stress–Strain Curves and Mineral Content

Sun

Lou

et al. 2022

Geofluids

View full text Add to dashboard Cite

The evaluation of rock mechanic characteristics of shale reservoir is the key for the success of fracturing. Several limitations such as complex lithology can affect the accuracy of the rock mechanic property computation. In this research, the mechanical rock properties of shale reservoirs were analyzed based on experimental tests including shale-reservoir mineral composition, uniaxial compressive strength, and triaxial compression tests. The results showed that (1) the difference in mineral composition leads to easier fracturing of sand shale reservoirs compared with pure shale reservoir. (2) Under uniaxial conditions, the rock mechanical parameters along the vertical bedding direction of sand shale reservoirs are better than pure shale reservoir parameters. The mechanical properties of shale reservoirs in parallel bedding direction are less affected by lithology. Under triaxial conditions, the confining pressure increases more than 4.0 times with the compressive strength of rocks, and the rock Young’s modulus in the parallel bedding direction is higher compared with the vertical bedding direction. (3) Rock failure mode is mainly subdivided into cutting and splitting modes, and the bedding features of rock mechanic properties highly influence the drilling and fracturing operations. This study offers guidelines for the optimization of the drilling and fracturing process based on accurate evaluation of the rock mechanical properties.

show abstract

Section: Effect Of Bedding On the Mechanical Properties Of Rocks Unde...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Shale-Reservoir Rocks Based on Stress–Strain Curves and Mineral Content

Sun

Lou

et al. 2022

Geofluids

View full text Add to dashboard Cite

show abstract

“…Xu et al [25] investigated the effects of strain rate and flaw inclination angle on the strength and deformation properties of granite and found that the influence of strain rate is comparatively more than the flaw inclination angle. Feng et al [26] studied the fracturing behavior of conjugate-flawed sandstone subjected to coupled static-dynamic compression loading.…”

Section: Introductionmentioning

confidence: 99%

Experimental assessment of dynamic loading response of grouted non-persistent jointed rock

Kumar

Tiwari

Das

2023

IOP Conf. Ser.: Earth Environ. Sci.

View full text Add to dashboard Cite

Grouting is a well-established engineering practice for stabilizing the jointed and/or fractured rock mass. This process may lead to the enhancement of the mechanical properties of fractured rocks. In the majority of the studies, the efficiency of grouting is determined under static loading conditions. Nonetheless, the grouted rock may be subjected to different dynamic loading from blasts or earthquakes. The present study explored the dynamic loading response, in terms of strength and fracture propagation, of a rock mass having a diagonal non-persistent joint (45° to the loading direction) subjected to impact loading to determine the efficiency of grout material. The focus of the study is to present a comparative assessment of different grout materials under dynamic loading. Split Hopkinson Pressure Bar (SHPB) was used to conduct the compressive impact tests on the synthetic rock mass with varying infill conditions (unfilled, cement-filled and epoxy-filled). The progressive fractures within the specimens were monitored by Photron fastcam analysis (PFA, a high-speed image analysis) and digital image correlation (DIC). The experiments highlighted that the strength of rock mass has an increasing trend with the dynamic strain rate. Epoxy resin provided a better strength enhancement than cement paste as the grout material. Due to the higher strength of epoxy resin than cement paste, the epoxy-grouted jointed rock demonstrates a similar response as the intact rock. In the case of both unfilled and cement-filled specimens, the nature of the primary crack was the coplanar shear crack. In contrast, with the injection of epoxy grout, the nature of the initial crack became the tensile or far-field tensile crack, which is often noticed in intact rocks.

show abstract

“…Accurate evaluation of building structural damage risk is essential for preventing devastating risks. In addition, it is beneficial to mitigate risk in advance (Feng et al, 2021a;Feng et al, 2021b).…”

Section: Introductionmentioning

confidence: 99%

Ground Settlement-Induced Building Damage Assessment With Modified Lanczos Algorithm and Extreme Learning Machine

Yang

Wang

Feng

et al. 2022

Front. Environ. Sci.

View full text Add to dashboard Cite

Construction, tunneling, and other urban anthropogenic activities strain neighboring buildings through distortion and rotation on both the surface and underground, resulting in instability of the local geological structure. This may cause devastating structural damage to buildings. Therefore, quantitative assessment of building structural damage is essential for the safety of local communities. In this study, a novel data-driven approach was applied to assess the building damage risks in urban areas. Data collected from over 50 buildings adjacent to the construction site were analyzed. The extreme learning machine (ELM) algorithm was applied to predict building structural risks. A modified Lanczos algorithm was used to regularize the ELM and improve the overall prediction performance. The computational results demonstrate the robustness and efficiency of the proposed Lanczos algorithm-regularized ELM.

show abstract

Mechanical behaviors of conjugate-flawed rocks subjected to coupled static–dynamic compression

Cited by 44 publications

References 48 publications

Mechanical Properties of Shale-Reservoir Rocks Based on Stress–Strain Curves and Mineral Content

Mechanical Properties of Shale-Reservoir Rocks Based on Stress–Strain Curves and Mineral Content

Experimental assessment of dynamic loading response of grouted non-persistent jointed rock

Ground Settlement-Induced Building Damage Assessment With Modified Lanczos Algorithm and Extreme Learning Machine

Contact Info

Product

Resources

About