Contributions of In-Situ Stress Transient Redistribution to Blasting Excavation Damage Zone of Deep Tunnels

Peng, Yan; Lu, Wenbo; Chen, Ming; Hu, Yingguo; Zhou, Chuangbing; Wu, Xinxia

doi:10.1007/s00603-014-0571-3

Cited by 75 publications

(21 citation statements)

References 10 publications

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“…It is a necessary prerequisite to determine the mechanical properties of engineering rock mass, analyze the stability of surrounding rock, and realize the scientific design of rock excavation and decisionmaking [7]. With the continuous expansion of the scale and depth of mine excavation, in situ stress has become more prominent and the occurrence of many disaster phenomena is closely related to the in situ stress [8][9][10]. Therefore, it is necessary to determine the distribution of the in situ stress before the mining project.…”

Section: Introductionmentioning

confidence: 99%

A Simple and Accurate Interpretation Method of In Situ Stress Measurement Based on Rock Kaiser Effect and Its Application

Zhao

Yan

et al. 2018

Geofluids

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Many deep underground excavation practices show that the size and distribution of in situ stress are the main factors resulting in the deformation and instability of the surrounding rock structure. The in situ stress measured by the Kaiser effect of rock is used by engineers because of its economy and convenience. However, due to the lack of quantitative judgment basis in determining the Kaiser point position, there is a large artificial error in the practical application. In response to the problem, this study systematically investigates the characteristics of rock acoustic emission curve on the basis of the fractal theory and establishes an accurate and simple interpretation method for determining the Kaiser point position. The indoor rock acoustic emission test was carried out by drilling a rock sample at a mine site. By using the conventional tangent method, the cumulative ringing count rate-time-stress curve of rock acoustic emission is analyzed to preliminarily determine the time range of Kaiser point appearance. Considering that the fractal dimension of the rock Kaiser point is lower than the adjacent point, the minimum point of the fractal dimension of this time range can be determined from the fractal dimension-time-stress curve. Such determined point is the Kaiser point. The size of the in situ stress is calculated using an analytical method. Based on the value of the in situ stress, the distribution of the in situ stress in the mining area is further analyzed using the geological structure of the mine. The maximum principal stress is 19.38 MPa, with a direction of N (30°-40°) E, and the minimum principal stress is 8.02 MPa with a direction of N (50°-60°) W. The maximum and minimum principal stresses are approximately in the horizontal plane. The intermediate principal stress is 11.73 MPa in vertically downward. These results are basically consistent with the distribution statistical law of the measured in situ stress fields in the world. The results presented in the study could provide a reference for the later mining, stability evaluation, and support of the surrounding rock.

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Section: Introductionmentioning

confidence: 99%

A Simple and Accurate Interpretation Method of In Situ Stress Measurement Based on Rock Kaiser Effect and Its Application

Zhao

Yan

et al. 2018

Geofluids

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“…erefore, the Cowper-Symonds model is considered. e elastic-plastic-kinematic model considers the effect of strain rate and strain hardening on the rock mass and can accurately describe the fracture pattern during blasting [37][38][39]. e expression is written as follows [40]:…”

Section: Numerical Simulation Of Crack Propagationmentioning

confidence: 99%

Effects of Unidirectional In Situ Stress on Crack Propagation of a Jointed Rock Mass Subjected to Stress Wave

Fan

Cai

2021

Shock and Vibration

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This paper proposes a large-scale experiment combined with multiple cement mortar blocks to simulate stress wave propagation across a jointed rock mass under unidirectional in situ stress. Two identical mortar block models with smooth, dry, and unfilled joints were poured. The stress waves in Model 1 and Model 2 were generated by an electric spark source and a blast-induced source, respectively. The effects of these two excitation sources on stress wave propagation were compared through crack propagation experiments. The experimental results show that the peak value of the transmitted strain wave decreases as the in situ stress increases. The unidirectional in situ stress has a certain inhibitory effect on the stress wave propagation. It also indicates that for Model 1 with the electric spark source, no cracks on the upper surface, but a Livingstone blasting crater at the bottom is generated. For Model 2 with the blast-induced source, cracks on the upper surface and a blasting crater at the bottom are produced. The results verify the similarity between the electric spark source and the explosive source. The two-dimensional finite element program (ANSYS/LS-DYNA) was applied to further simulate the crack propagation of a jointed rock mass under different in situ stresses. The results of numerical simulation verify that the in situ stress has a clear guiding effect on the crack propagation.

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“…For example, the average depth of metal mines in South Africa has reached 2000 m, the Western Deep Level gold mine has reached 4800 m [3], and the borehole has reached 6779 m in the Baltic Shield [4]. In such extreme deep mining, some deemed as negligible problems in shallow depths turn to be very crucial and intractable, i.e., high stress, high temperature, high water pressure, and the disturbance resulted from mining activities, which may lead to sudden and unpredictable destruction of the rock mass [5][6][7][8]. Regarding the in situ stress field, existing theoretical and experimental studies show that the interaction between the explosive stress field created by blasting and the in situ stress field will enhance or weaken rock fragmentation effect [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Empty‐Hole Effect during Parallel‐Hole Cutting under Different In Situ Stress Conditions

Luo

Chen

et al. 2021

Advances in Civil Engineering

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With the progress of deep mining in mine exploitation, the effect of the in situ stress field plays a more and more significant and crucial role in rock blasting. To uncover the impact of in situ stress field on empty-hole effect during parallel-hole cutting, the distribution and the trend of changes in dynamic stress around empty hole during blasting under different in situ stress conditions are simulated based on the basic model for parallel-hole cutting using 3D finite element analysis software ANSYS/LS-DYNA and implicit-explicit analysis method. Subsequently, the law of variation in the empty-hole effect under different in situ stress conditions is determined, and the effects of horizontal and vertical stress fields are analyzed in detail. The simulation results show that the overall increase in in situ stress can facilitate compressive failure and inhibit tensile failure in the rock mass around an empty hole during blasting. When empty holes are arranged horizontally, the effect of the vertical stress field is consistent with that of the in situ stress field, while the effect of the horizontal stress field is opposite to that of the in situ stress field. With the increased stress, the inhibitive effect of the vertical stress field on tensile stress around an empty hole is remarkably stronger than that of the horizontal stress field. Finally, the numerically simulated results are verified by the theoretical calculation. This study can provide new insight and a simple but accurate numerical simulation method to investigate how the in situ stress field affects the empty-hole effect, especially in deep mining.

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Contributions of In-Situ Stress Transient Redistribution to Blasting Excavation Damage Zone of Deep Tunnels

Cited by 75 publications

References 10 publications

A Simple and Accurate Interpretation Method of In Situ Stress Measurement Based on Rock Kaiser Effect and Its Application

A Simple and Accurate Interpretation Method of In Situ Stress Measurement Based on Rock Kaiser Effect and Its Application

Effects of Unidirectional In Situ Stress on Crack Propagation of a Jointed Rock Mass Subjected to Stress Wave

Numerical Simulation of Empty‐Hole Effect during Parallel‐Hole Cutting under Different In Situ Stress Conditions

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