Comparative study on tunnel blast-induced vibration for the underground cavern group

Peng, Yaxiong; Liu, Guangjin; Wu, Lenan; Zuo, Qingjun; Liu, Yunsi; Zhang, Chao

doi:10.1007/s12665-020-09362-z

Cited by 41 publications

(18 citation statements)

References 30 publications

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“…As the weak plane in rock mass, the joint is usually the key factor in the stability of instances of rock mass engineering such as slopes, dam foundations and underground chambers [ 1 , 2 , 3 ], thus further affecting human life and property as well as the environment [ 4 , 5 , 6 ]. Research on the deformation and strength characteristics of joints aims to provide a basis for the evaluation and utilization of rock mass stability [ 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Shear Behavior of Rock Composite Material under Normal Unloading Conditions

et al. 2023

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As a composite material, the stability of rock mass is usually controlled by a joint. During the process of excavation, the normal stress of the joint decreases continuously, and then the shear strength of the joint decreases, which may eventually lead to the instability and failure of rock mass. Previous studies have mainly focused on the shear behavior of joints under constant normal stress, but have rarely considered the unloading of normal stress. In this paper, a direct shear test of joints with different roughness was carried out, in which the shear stress remained unchanged while the normal stress decreased. The strength characteristics of joints were explored, and the deformation and acoustic emission-counting characteristics of joints were analyzed by digital image correlation (DIC) techniques and acoustic emission (AE). A new method for predicting the instability of joints under normal unloading was proposed based on the evolution law of normal deformation energy (Un), tangential deformation energy (Us) and total deformation energy (U0). The results show the following: (1) The unloading amount of normal stress was enlarged for greater initial normal stress and roughness, while it decreased with an increase in initial shear stress. (2) AE events reached their maximum when the normal stress was equal to the failure normal stress, and the b-value fluctuated more frequently in stable development periods under normal unloading conditions. (3) U0 would change with the loading and unloading of stress, and this may be used to predict the unloading instability of rock mass using the abrupt change of U0.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on Shear Behavior of Rock Composite Material under Normal Unloading Conditions

et al. 2023

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“…In fact, cyclic load is a more common occurrence than static load in the destruction of rock and soil structures [ 29 , 30 , 31 ]. Under the action of cyclic shear load, the joint interface will continuously slip and close, and the rough micro-convex on the interface will suffer periodic wear and passivation, leading to the deterioration of shear strength parameters [ 32 , 33 ].…”

Section: Introductionmentioning

confidence: 99%

Apparent Deterioration Law and Shear Failure Mode of Rock–Mortar Interface Based on Topography-Sensing Technology

et al. 2023

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As an advanced spatial technology, topography-sensing technology is comprehensive, macroscopic, and intuitive. It shows unique advantages for rock structure interpretation and has important guiding significance for the research of the shear performances of rock–mortar interface under cyclic load in rock mass engineering. In this paper, cyclic shearing tests combined with the shear surface topography-sensing technology are employed to investigate the evolution characteristics of the interface morphology and the strength deterioration of the rock–mortar interface. Primarily, mortar and three types of rocks are used to prepare different rock–mortar interfaces, which are then applied to cyclic shear loading under two constant normal stresses. Subsequently, the shear strength degradation and dilatancy characteristics of rock–mortar interfaces with varying shear times are discussed. In addition, on the basis of the non-contact three-dimensional topography-sensing technology, the apparent three-dimensional point–cloud coordinate information of rock–mortar interface before and after each shear loading is obtained, and the apparent three-dimensional topography parameters of rock–mortar interface are calculated, according to which the influences of normal stress and lithology on the topography of interface subjected to cyclic shearing loading are analyzed.

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“…In many populous cities, twin tunnels are increasingly constructed to improve transportation capacity (Alielahi and Adampira, 2016). When the drilling and blasting method is adopted, blasting waves will impose a potential danger on the adjacent existing tunnels (Xia et al, 2013;Zhou et al, 2016;Dang et al, 2018;Xue et al, 2019;Peng et al, 2021). Evaluating the dynamic response and proposing a safety criterion of the existing tunnels subjected to blasting waves are of the utmost importance.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Response of Twin Circular Unlined Tunnels Subjected to Blasting P Waves

Yao

Jia

et al. 2022

Front. Earth Sci.

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The dynamic response of twin circular unlined tunnels is studied by indirect boundary integral equation method (IBIEM). The twin tunnels are assumed to lie in an unbounded elastic space subjected to blasting P waves. The influence of incident angle on the distribution of DSCF around the twin tunnels is analyzed. Besides, the influences of normalized wave number αa and normalized distance d* (ratio of spacing distance to tunnel radius) on the reference DSCF, that is, the peak DSCF for different incident angles with an assurance rate of 95%, are discussed. Results show that 1) the IBIEM is a high-precision method analyzing the DSCF around twin circular unlined tunnels induced by blasting P waves; 2) the incident angle θ0, αa, and d* all have significant influences on the distribution of DSCF; 3) for a constant d*, the peak DSCF around the right tunnel is slightly greater than the left one; 4) the reference DSCF decreases exponentially with the increasing of αa or d*, and the corresponding fitting functions are proposed.

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Comparative study on tunnel blast-induced vibration for the underground cavern group

Cited by 41 publications

References 30 publications

Experimental Study on Shear Behavior of Rock Composite Material under Normal Unloading Conditions

Experimental Study on Shear Behavior of Rock Composite Material under Normal Unloading Conditions

Apparent Deterioration Law and Shear Failure Mode of Rock–Mortar Interface Based on Topography-Sensing Technology

Dynamic Response of Twin Circular Unlined Tunnels Subjected to Blasting P Waves

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