Failure mechanism of non-persistent jointed rock-like specimens under uniaxial loading: Laboratory testing

Cao, Rihong; Yao, Rubing; Meng, Jingjing; Lin, Qibin; Lin, Hang; Li, Su

doi:10.1016/j.ijrmms.2020.104341

Cited by 94 publications

(31 citation statements)

References 41 publications

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“…e natural rock mass contains a large number of joints which have a great impact on the mechanical properties of rock mass and the propagation of stress wave [1][2][3][4][5][6][7][8]. At present, most of the rock mass excavation involved in underground engineering still adopts the drilling and blasting method.…”

Section: Introductionmentioning

confidence: 99%

Model Test Study on Cylindrical Blasting Stress Wave Propagation across Jointed Rock Mass with Different Initial Stresses

Dong

Huang

2020

Advances in Civil Engineering

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In the drilling and blasting excavation of underground rock mass, the stress wave produced by the blasting holes usually propagates in the form of cylindrical wave, while the rock mass surrounding the underground engineering is initially subjected to the in situ stress. To explore the propagation and attenuation law of cylindrical stress wave in the in situ stressed rock mass, a model test of cylindrical blasting stress wave propagation across the intact and jointed rock mass under different initial stresses was carried out. First, the attenuation law of the cylindrical stress wave in the intact rock mass under different confining pressures is analysed, and then the influence of the confining pressure scales, the angle, and the number of joints on the propagation law of the cylindrical blast wave in the jointed rock mass is studied. The experimental results show that the physical attenuation of the cylindrical wave in the intact rock mass decreases and then increases as the confining pressure increases from zero. Under zero confining pressure, the transmission coefficient of the cylindrical wave in the jointed rock mass decreases with the increase of joint angle, and the transmission coefficient increases with the increase of the joint angle under confining pressure. As the confining pressure increases from zero, the transmission coefficient shows a trend of increasing firstly and then decreasing.

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Section: Introductionmentioning

confidence: 99%

Model Test Study on Cylindrical Blasting Stress Wave Propagation across Jointed Rock Mass with Different Initial Stresses

Dong

Huang

2020

Advances in Civil Engineering

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“…(5) Because the physical characteristics of the strata in the Hangzhou area are similar to those in the Shanghai area, the construction of jet grouting with a triple fluid system-twin jet in the Shanghai area should be used for reference. Meanwhile, in the design stage of jet grouting, relevant methods should be used to reasonably estimate the excess pore water pressure and the influence of jet grouting on ground movement [28][29][30][31][32][33][34].…”

Section: Technical Measures and Effectsmentioning

confidence: 99%

Investigation of Water Leakage of Metro Segments Caused by Metro Underpass Structures

Liang

Jin

et al. 2021

Advances in Civil Engineering

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Water leaking into metro segments is related directly to the presence of underground water. However, to date, the underground confined water channels formed by metro underpass reinforcement structures have not been considered as causes of the problem. In the present study, based on field investigations and geological data, confined water is identified as the source of segment leakage on Line 5 of Hangzhou Metro in China. It is then hypothesized that the problem stems from an underground confined water channel formed under the reinforced structure of the subway. Numerical simulations predict a settlement difference of 8–10 mm between the reinforcement area and the weak strata, and field monitoring data show this difference to be 8.62 mm. This consistency between the numerical simulations and the field measurements verifies the hypothesis. Finally, given the causes of underground confined water channels, corresponding technical measures such as piecewise secondary grouting are proposed to cut them off and avoid metro-segment leakage. The present research results contribute to the causes of and the laws governing the metro-segment leakage that occurs at subway stations and other reinforced structures.

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“…The empirical equation can be used to accurately predict the inflow of groundwater into a tunnel and thus the amount of water entering the tunnel. Discrete element numerical simulations [16][17][18][19][20], mechanical tests [21][22][23][24], and model tests [25][26][27][28] have been used to study the surrounding rock deformation laws of jointed rock in underground engineering. As an emerging technology, 3D printing is also used in the research of jointed rock masses.…”

Section: Introductionmentioning

confidence: 99%

Research on the Deformation Law of Jointed Surrounding Rock during Tunnel Excavation Based on Hydromechanical Coupling

Wang

2021

Geofluids

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The coupling of the joint network and groundwater in rock under bias conditions has a significant impact on the deformation and failure of the surrounding rock due to tunnel excavation. This paper studies the deformation and failure of surrounding rock after tunnel excavation under different joint network and groundwater conditions. A finite element-based composite joint network modeling method is proposed in this paper, and the typical parameters of the surrounding rock, such as the plastic zone size, vertical displacement, and lateral displacement, are analyzed and compared through numerical calculations. According to the different stratum and hydraulic conditions considered, four numerical models under four different working conditions are established and studied. The deformation and failure laws of the surrounding rock during tunnel excavation are obtained. The results show that with a single joint network, when there is no influence of groundwater, the surrounding rock mainly undergoes shear failure at the arch crown after tunnel excavation. When the influence of groundwater is considered, there are differences in the mode of damage between the left and right sides of the tunnel. The stratum approximately 1 m from the invert breaks, and the right sidewall fails approximately 1 m from the measuring point. In rock with a composite joint network, when groundwater is not considered, two kinds of failures occur in the surrounding rock near the tunnel; however, the surrounding rock far from the tunnel is dominated by shear failure. The stratum approximately 3.5 m from the arch crown fractures and the surrounding rock within approximately 5.5 m from the measurement point on the right sidewall undergoes separation failure. Under the dual effects of joints and groundwater, soft rock deforms considerably. The total hydraulic gradient decreases from left to right before and after tunnel excavation. The total hydraulic gradient of the composite joint network strata is generally smaller than that of the single joint network. In the composite joint network strata, the total hydraulic gradient near the tunnel changes dramatically. This research can provide a reference for tunnel engineering under similar conditions.

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Failure mechanism of non-persistent jointed rock-like specimens under uniaxial loading: Laboratory testing

Cited by 94 publications

References 41 publications

Model Test Study on Cylindrical Blasting Stress Wave Propagation across Jointed Rock Mass with Different Initial Stresses

Model Test Study on Cylindrical Blasting Stress Wave Propagation across Jointed Rock Mass with Different Initial Stresses

Investigation of Water Leakage of Metro Segments Caused by Metro Underpass Structures

Research on the Deformation Law of Jointed Surrounding Rock during Tunnel Excavation Based on Hydromechanical Coupling

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