Numerical Simulation of Cracking Failure and Weakening Law of Roadway Surrounding Rock under High Stress

Cheng, Feng; Chen, Aijun; Wu, Di; Tang, Xianyuan; Su, Chunhui

doi:10.1155/2021/7236077

Cited by 4 publications

(4 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…According to the in situ monitoring data of the underground 400 m roadway in the study area, the roadway section is a semi-circular arch; the section width is 2.8 m; the straight wall height is 1.6 m; the arch height is 1.4 m; and the section area is 6.55 m 2 . The inner surface area of each 1 m long roadway is 9.68 m 2 , and the perimeter length of the roadway section is 10.396 m. The research area was selected to be the surrounding rock of the roadway, in the range of 14 m × 10 m × 1500 m [42], as shown in Figure 21.…”

Section: Overview Of Mining Projectmentioning

confidence: 99%

See 1 more Smart Citation

Research on New Solid Waste Heat Insulation Material for Deep Mining

Wen

Zheng

2023

Minerals

View full text Add to dashboard Cite

The global demand for mineral resources has led to the gradual transformation of the mining industry from the traditional shallow, small-scale mining mode to the high-intensity mining of deep underground mines. Due to the high stress, high temperature, high permeability, and easy disturbance of deep mines, new challenges have been brought to the mining of materials. Some scholars have improved the thermal insulation performance of concrete by adding low thermal conductivity materials such as ceramsite, shell, and natural fiber to traditional shotcrete, but there are still high costs, insufficient support strength, and unsatisfactory thermal insulation effects. Given the background related to the fact that it is still not possible to fully recycle the large amount of solid waste generated by mining activities, this paper, with traditional shotcrete as its basis, uses coal fly ash to replace part of the cement and tailings to replace part of the sand and gravel aggregate. In addition, it adds basalt fiber to reduce thermal conductivity and restore strength. An orthogonal experiment of three factors and three levels was designed to explore a new type of solid waste-based thermal insulation support shotcrete material. Through the testing and analysis of the mechanical and thermal properties of the specimens, it was concluded that the optimal ratio of the materials was 45% fly ash, 50% tailings, and 25% basalt fiber (the percentage of the total mass of fly ash and cement). The compressive strength of the specimens after curing for 28 days could reach 16.26 MPa, and the thermal conductivity and apparent density were 0.228561 W/(m·k) and 1544.00 kg/m3, respectively. By using COMSOL Multiphysics multi-physics coupling software to analyze the coupling of the stress field and temperature field, it was concluded that the optimum thickness of the thermal insulation layer of this material was 150 mm. The field application in a mine in Shandong Province proved that it met the effects of thermal insulation (the ability to isolate heat conduction) and support. The successful trial of this material provides a new idea for the solving of the problem of heat damage and solid waste utilization in deep mines, which has a certain practical significance.

show abstract

Section: Overview Of Mining Projectmentioning

confidence: 99%

“…inner surface area of each 1 m long roadway is 9.68 m 2 , and the perimeter lengt roadway section is 10.396 m. The research area was selected to be the surrounding the roadway, in the range of 14 m × 10 m × 1500 m [42], as shown in Figure 21. The COMSOL direct solver was used to solve the problem.…”

Section: Overview Of Mining Projectmentioning

confidence: 99%

Research on New Solid Waste Heat Insulation Material for Deep Mining

Wen

Zheng

2023

Minerals

View full text Add to dashboard Cite

show abstract

“…By introducing a tensile fracture softening failure model, he obtained the crack propagation characteristics under single-hole and double-hole drilling conditions. Cheng Shufan [8] analyzed the crack propagation and material damage distribution of rock masses under explosive loads using the HJC model and the virtual-damage crack model of the cleavage cohesion element. Li Qing [9] and Yang Renshu [10], among others, explored the interaction between cracks and stress waves under explosive loads using a transmission-type explosive dynamic caustics optical test system.…”

Section: Introductionmentioning

confidence: 99%

A Study on Crack Initiation and Propagation of Welded Joints under Explosive Load

Ding,

Gong,

Sun

et al. 2024

JMSE

View full text Add to dashboard Cite

Welded joints in naval ship hull structures are weak areas under explosive load, but there are relatively few studies investigating the failure characteristics of welded joints through dynamic fracture and explosion tests. In order to explore and predict the failure characteristics of welded joints under explosive load, instrumented Charpy impact tests, explosion tests, and numerical simulations were carried out. The dynamic fracture toughness of ultra-high strength ship hull structural steel welded joints was obtained, and the dynamic stress intensity factors, together with the correlation between stress wave and crack propagation at different positions, were acquired. The results showed that the stress state at the crack tip of a Charpy impact specimen was consistent with that of a welded joint under explosive loads, and the crack initiated when the dynamic stress intensity factor exceeded the dynamic fracture toughness. The results indicated that the dynamic fracture toughness obtained by instrumented Charpy impact tests could be used to predict the crack initiation characteristics of welded structures under explosive load, and the stress wave at the crack tip was basically perpendicular to the crack propagation surface and promoted the rapid propagation of cracks.

show abstract

“…The stress transfer technology, later also referred to as depressurization, was invented to reduce the impact of high stress [17]. This approach transfers the high stress around the roadway surface into the deeper stable rock masses by artificially weakening the bearing capacity of surface rocks [18]. The stress transfer technology has been widely applied in roadways subject to complex conditions, such as deep roadways, dynamic roadways, and soft rock roadways.…”

Section: Introductionmentioning

confidence: 99%

Impact of Depressurizing Boreholes on Energy Dissipation in Deep Roadway

Wang

et al. 2022

Geofluids

View full text Add to dashboard Cite

Depressurizing borehole drilling is an effective approach to control the large deformation of deep roadway. It can transfer the high stress in the proximity of the roadway into the deep stable rock masses. However, it should be noted that the borehole drilling will inevitably cause the secondary damage to roadway. To determine the parameters of depressurizing boreholes, the degree of the secondary damage must be evaluated properly. Given that the rock mass failure is an unstable phenomenon driven by energy, it is of great use to reveal the disturbing impact of depressurizing boreholes on the roadway stability from the angle of energy dissipation. This is much more consistent with the failure nature of rock mass. Hence, an integrated method of laboratory test, numerical simulation, and theoretical analysis was used to study the disturbing effect of depressurizing boreholes on roadway energy dissipation. The equations of elastic energy and dissipated energy of rock cell grid were derived based on the energy principle and finite-difference algorithm, which was implemented into FLAC3D software by the FISH language. The numerical stress-strain and dissipated energy-strain curves of rock samples were verified by experimentally obtained data, and the whole deformation path from roadway excavation to instability was back-analyzed by the dissipated energy evolution. Based upon the energy model, the ratio of borehole diameter D to row spacing R ( D / R ) was selected as the variable to analyze the influence of borehole parameters on the depressurizing effect. The varying D / R leads to three depressurizing states: insufficient depressurization, sufficient depressurization, and overdepressurization. Increasing D / R will make the roadway transfer from insufficient depressurization to sufficient depressurization and finally to overdepressurization. The sufficient depressurizing state could be realized by adjusting the borehole D / R value, which is of great use to the roadway control. The D / R values of 1 : 6 to 1 : 2 were proposed for the test roadway, and D / R = 1 : 6 was applied in the field test, which achieved a well roadway control effect.

show abstract

Numerical Simulation of Cracking Failure and Weakening Law of Roadway Surrounding Rock under High Stress

Cited by 4 publications

References 32 publications

Research on New Solid Waste Heat Insulation Material for Deep Mining

Research on New Solid Waste Heat Insulation Material for Deep Mining

A Study on Crack Initiation and Propagation of Welded Joints under Explosive Load

Impact of Depressurizing Boreholes on Energy Dissipation in Deep Roadway

Contact Info

Product

Resources

About