Prediction of Ground Vibration Induced Due to Single Hole Blast Using Explicit Dynamics

Kumar, Shankar; Mishra, A. K.; Choudhary, Bhanwar Singh; Sinha, Rabindra Kumar; Deepak, Desh; Agrawal, Hemant

doi:10.1007/s42461-019-00162-z

Cited by 22 publications

(13 citation statements)

References 24 publications

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“…Due to the advantages of high excavation efficiency, strong adaptability to surrounding rock, low economic cost, and relatively mature technology, the drilling-blasting method is still the main construction method in the selection of mountain tunnel construction scheme [1][2][3][4][5]. e blasting vibration produced by the drilling-blasting method will damage the surrounding rock and supporting structure of the tunnel, especially in the process of short footage blasting construction, in which the surrounding rock and supporting structure will be damaged by blasting vibration for many times, and the stability of the surrounding rock and support structure in the construction process plays a decisive role in the safety of drilling and blasting construction.…”

Section: Introductionmentioning

confidence: 99%

Study on the Vibration Effect of Short Footage Blasting Load on Surrounding Rock-Support Structure of Tunnel

Dai

Sui

2020

Shock and Vibration

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In the excavation process of a drilling and blasting tunnel, it takes multiple blasting excavations to form, so it is inevitable to produce multiple blasting impact loads, which will cause certain vibration damage to the surrounding rock-support structure. To solve this problem, based on the attenuation formula of blasting vibration wave and considering the cumulative effect of short footage blasting load, the radial displacement formula of surrounding rock particles is derived, and the analytical solution of vibration velocity field is obtained by using the method of separating variables. Then, taking Cuobuling station of Qingdao Metro as the engineering background, the finite element software is used to simulate the tunnel excavation process under the action of short footage multiple blasting. The vibration damage impact of multiple blasting loads on the surrounding rock-supporting structure is analyzed from the accumulated displacement value and vibration velocity cumulative value of the excavation tunnel. The results show that the damage accumulation effect is produced in the surrounding rock of each section during the blasting construction, among which the accumulation is the largest at the arch bottom. With the increase of blasting times, the damage of the surrounding rock is still accumulating gradually. Compared with the first blasting, the peak value of vibration velocity of the second blasting increased by 114%, and with the increase of blasting times, the variation trend of maximum vibration velocity of the measuring point showed an upward trend, but the subsequent vibration acceleration decreased. Under the condition of grade V surrounding rock, when the thickness of the concrete spray layer is 350 mm, the maximum displacement cumulative value of each measuring point in profile 1-1 is reduced by about 50.4% compared with that without support. According to the displacement nephogram of the concrete spray layer, the displacement of the concrete spray layer accumulates after three times of blasting, which affects the stability of the supporting structure. Finally, an example analysis is carried out and compared with the analytical model results to verify the accuracy of the mechanical model.

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Section: Introductionmentioning

confidence: 99%

Study on the Vibration Effect of Short Footage Blasting Load on Surrounding Rock-Support Structure of Tunnel

Dai

Sui

2020

Shock and Vibration

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“…The Bayesian approach is applied to select the most appropriate regression model for characterization of the PPV using the SD values from an opencast coal mine, situated in an Eastern-Central part of Jharia coalfield in the Dhanbad district of Jharkhand, India (Kumar et al 2020). The data also includes 20 direct measurements of PPV values which will be used for validating the result of the proposed approaches.…”

Section: Illustrative Examplementioning

confidence: 99%

“…Although in recent decades, various artificial intelligence methods such as ANN, SVM, ANFIS, GEP, and their hybrids (Lawal and Kwon 2020) have been proposed for predicting the PPV and their performances have been encouraging as compared to the empirical models in many cases; nevertheless, the quarry operators still largely depend on the empirical models as they consider them simple because the practical implementation of many of the available AI-based models still seems like a mirage. The numerical method has also been used for predicting the PPV by generating some artificial vibrations (Kumar et al 2020). This method has also been known to be very difficult to implement and costly (Lawal and Kwon 2020).…”

Section: Introductionmentioning

confidence: 99%

Predicting the peak particle velocity from rock blasting operations using Bayesian approach

2022

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Measuring the blast-induced ground vibration at blasting sites is very important, to plan and avoid adverse effects of blasting in terms of the peak particle velocity (PPV). However, the measurement of PPV often requires time, cost, and logistic commitment, which may not be economical for small-scale mining operations. This has prompted the development of numerous regression equations in the literature to estimate PPV from a relatively easier to estimate scaled distance (SD) measurement. With numerous regression equations available in the literature, there is a challenge of how to select the appropriate model for a specific blasting site, more so that rocks behave differently from site to site because of different geological processes that rocks are subjected to. This study develops a method that selects appropriate models for specific blasting sites by comparing the evidence and occurrence probability of different regression models. The appropriate model is the model with the highest evidence and occurrence probability given the available blasting site SD data. The selected model is then integrated with prior knowledge and available blasting SD data in Bayesian framework for probabilistic characterization of PPV. The SD and PPV data at the opencast coal mine, Jharia coalfield in the Dhanbad district of Jharkhand, India, is used to illustrate and validate the approach. The mean and standard deviation of simulated PPV samples from the proposed approach are 12.38 mm/s and 7.36 mm/s, respectively, which are close to the mean of 12.03 mm/s and standard deviation of 9.24 mm/s estimated from the measured PPV at the site. In addition, the probability distribution of the simulated PPV samples is consistent with the probability distribution of the measured PPV at the blasting site.

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“…Existing studies by Blair (2015), Yang et al (2018a), and Kumar et al (2020) indicated that the grid size had a great influence on the accuracy of simulation results. Therefore, it was necessary to carry out convergence tests to check the grid size.…”

Section: Numerical Modelmentioning

confidence: 99%

Study on the novel technique of straight hole cutting blasting with a bottom charged central hole exploded supplementally

Cheng

Wang

et al. 2021

Arab J Geosci

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To improve the cutting efficiency in the deep hole blasting of rock roadways, a straight hole cutting blasting technique with supplemental blasting of the central hole was developed. First, the blasting mechanisms of the traditional and novel cutting methods were analysed theoretically. For the novel cutting method, the upper uncharged part of the central hole still acted as empty hole. Cutting hole blasting could eject most of the rock mass in the cutting cavity and hence produce a new free face to weaken the clamping effect of central hole blasting. Then, the residual rock mass could be fully removed after central hole blasting. Second, simulation of the new cutting mode was conducted, which visualized the stress wave forming process. Simulation results showed that the rock mass at the bottom of the cutting cavity could be predamaged by the stress wave caused by cutting hole blasting, and the high-intensity stress field generated by central hole blasting would lead to further damage to the residual rock mass. Thus, the residual rock mass could be thrown out readily. Finally, the auxiliary roadway of an iron mine was selected for the blasting experiments. After statistical analysis, due to the supplemental blasting of the central hole, the average blasting footage was increased by 0.35 m, and the average specific charge was reduced by 0.43 kg•m −3 , which validated the predominance of the novel cutting method in the deep hole blasting of rock roadways.

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Prediction of Ground Vibration Induced Due to Single Hole Blast Using Explicit Dynamics

Cited by 22 publications

References 24 publications

Study on the Vibration Effect of Short Footage Blasting Load on Surrounding Rock-Support Structure of Tunnel

Study on the Vibration Effect of Short Footage Blasting Load on Surrounding Rock-Support Structure of Tunnel

Predicting the peak particle velocity from rock blasting operations using Bayesian approach

Study on the novel technique of straight hole cutting blasting with a bottom charged central hole exploded supplementally

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