Investigation of Dip Effect on Uniaxial Compressive Strength of Inclined Rock Sample by Experimental and Theoretical Models

Luo, Binyu; Ye, Yicheng; Hu, Ning; Wang, Weiqi

doi:10.1007/s00603-020-02234-9

Cited by 8 publications

(3 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…First, for intact rocks, the parameters (n) and (γ) in the H-B strength criteria are 1 and 0.5, respectively, which are constants [51][52][53][54][55]. Nevertheless, layered sandstone was used in this study which suffered from high initial stress state and had significant anisotropy, leading to the modification of H-B strength criteria.…”

Section: Discussionmentioning

confidence: 99%

Mohr–Coulomb and Modified Hoek–Brown Strength Criteria of Layered Sandstone Considering the Unloading Effect and Anisotropy

Song,

Zhang,

2023

Sustainability

View full text Add to dashboard Cite

The Mohr–Coulomb (M-C) and Hoek–Brown (H-B) strength criteria are widely used in various engineering fields, such as mining engineering, tunnel engineering and so on. To investigate the M-C and H-B strength criteria considering the unloading effect and anisotropy, series of triaxial loading (unloading) tests on layered sandstone were conducted. The results revealed that the peak strength was significantly affected by the unloading effect. Moreover, the cohesion and internal friction angle had a significant nonlinear relationship with the bedding angle. Additionally, the M-C and modified H-B strength criteria were established considering the unloading effect and anisotropy. Then, according to the strength criteria established, the peak strength could be estimated theoretically. Furthermore, compared to the M-C strength criteria, the modified H-B strength criteria were more appropriate for accurately estimating the triaxial compressive strength of layered sandstones. The conclusions obtained could provide certain references for the stability control of deep excavation engineering.

show abstract

Section: Discussionmentioning

confidence: 99%

Mohr–Coulomb and Modified Hoek–Brown Strength Criteria of Layered Sandstone Considering the Unloading Effect and Anisotropy

Song,

Zhang,

2023

Sustainability

View full text Add to dashboard Cite

show abstract

“…The results showed that the failur strength of granite has an obvious compression-shear coupling effect, and the larger th dip angle, the smaller the peak strength of rock failure. Taking the inclined pillar as th background, Luo et al [25] carried out the combined compression-shear loading test o The mechanical behavior and strength characteristics of the pillar are the basis of pillar design and stability evaluation. At present, laboratory tests and numerical simulation methods are mainly used to study the mechanical behavior and strength characteristics of inclined pillars.…”

Section: Introductionmentioning

confidence: 99%

“…The results showed that the failure strength of granite has an obvious compression-shear coupling effect, and the larger the dip angle, the smaller the peak strength of rock failure. Taking the inclined pillar as the background, Luo et al [25] carried out the combined compression-shear loading test of rock-like materials in the laboratory and established the strength model of rock, which provides an experimental idea for analyzing the strength of inclined pillars. The numerical simulation method was also used to study inclined pillar strength with the range of dip from 0 • to 40 • ; the inclined pillar often has a serious shear failure, and the strength shows a strong dip effect [26,27].…”

Section: Introductionmentioning

confidence: 99%

Theoretical Analysis for Stability Evaluation of Rock Mass Engineering Structure under Combined Compression-Shear Loading: A Case Study of Inclined Pillar

Sun

Luo

et al. 2021

Applied Sciences

Self Cite

View full text Add to dashboard Cite

An inclined pillar is a typical support structure under compression and shear loads for underground mining. The shear load caused by the inclination of the ore-body affects the bearing capacity of the pillar. At present, there is no systematic investigation on the influence of shear load on the stress state evolution and bearing capacity of the inclined pillar. Additionally, there is still a lack of effective evaluation of the bearing capacity of the inclined pillar in the presence of additional shear load. In this research, the theoretical analysis method is used to solve these problems. First, the compressive and shear load components on the inclined pillar were calculated by the tributary area method, and the average stress state of the inclined pillar, considering the influence of the shear load, was characterized by a series of generalized stress circles. The factors that affect the shear load, such as the area extraction ratio, the inclination of the ore-body, and the in-situ stress ratio, were analyzed, and it reveals that there are three kinds of stress paths of the inclined pillar and their trajectories are straight line, circle, and curve, respectively. Then, a shear strength model was proposed to evaluate the bearing capacity of inclined pillars. The expression of this model is multiplied by a vertical pillar strength model and a dimensionless coefficient that is named the contribution factor of shear load (CFSL). Some cases of inclined pillars were employed to verify the rationality of this model. Finally, the factors that affect the bearing capacity of pillars were analyzed. This investigation presents that the shear load affects the stress path and determines the bearing capacity of the pillar. Therefore, the shear load should not be neglected in pillar design and stability analysis.

show abstract

Experimental study on the physical and mechanical properties of carbonatite rocks under high confining pressure after thermal treatment

Yang,

Wang,

Yao

et al. 2024

Deep Underground Science and Engineering

View full text Add to dashboard Cite

Oil and gas exploration studies have been increasingly moving deeper into the earth. The rocks in deep and ultra‐deep reservoirs are exposed to a complex environment of high temperatures and large geo‐stresses. The Tarim oilfield in the Xinjiang Uygur Autonomous Region (Xinjiang for short), China, has achieved a breakthrough in the exploration of deep hydrocarbon reservoirs at a depth of over 9000 m. The mechanical properties of deep rocks are significantly different from those of shallow rocks. In this study, triaxial compression tests were conducted on heat‐treated carbonatite rocks to explore the evolution of the mechanical properties of carbonatite rocks under high confining pressure after thermal treatment. The rocks for the tests were collected from reservoirs in the Tarim oilfield, Xinjiang, China. The experiments were performed at confining pressures ranging from atmospheric to 120 MPa and temperatures ranging from 25 to 500°C. The results show that the critical confining pressure of the brittle–ductile transition increases with increasing temperature. Young's modulus is negatively correlated with the temperature and positively correlated with the confining pressure. As the confining pressure increases, the failure mode of the specimens gradually transforms from shear fracture failure into “V”‐type failure and finally into bulging failure (multiple shear fractures). With increasing temperature, the failure angle tends to decrease. In addition, an improved version of the Mohr‒Coulomb strength criterion with a temperature‐dependent power function was proposed to describe the failure strength of carbonatite rocks after exposure to high temperature and high confining pressure. The surface of the strength envelope of this criterion is temperature dependent, which could reflect the strength evolution of rock under high confining pressures after thermal treatment. Compared with other strength criteria, this criterion is more capable of replicating physical processes.

show abstract

Investigation of Dip Effect on Uniaxial Compressive Strength of Inclined Rock Sample by Experimental and Theoretical Models

Cited by 8 publications

References 39 publications

Mohr–Coulomb and Modified Hoek–Brown Strength Criteria of Layered Sandstone Considering the Unloading Effect and Anisotropy

Mohr–Coulomb and Modified Hoek–Brown Strength Criteria of Layered Sandstone Considering the Unloading Effect and Anisotropy

Theoretical Analysis for Stability Evaluation of Rock Mass Engineering Structure under Combined Compression-Shear Loading: A Case Study of Inclined Pillar

Experimental study on the physical and mechanical properties of carbonatite rocks under high confining pressure after thermal treatment

Contact Info

Product

Resources

About