Dynamic response and safety control of civil air defense tunnel under excavation blasting of subway tunnel

Zhang, Zhen; Zhou, Chuanbo; Remennikov, Alexander; Wu, Tingyao; Lu, Shiwei; Xia, Yuqing

doi:10.1016/j.tust.2021.103879

Cited by 52 publications

(28 citation statements)

References 20 publications

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“…Then, the fluid-structure coupling function was defined to realize the mechanical interaction between the fluid medium and solid medium (Hu et al 2014;Cheng et al 2021a). Furthermore, to eliminate the boundary reflection to simulate the infinite field through the finite field, artificial nonreflecting boundary conditions were imposed on the model surfaces other than the working face (Cheng et al 2021b;Zhang et al 2021;Jayasinghe et al 2017).…”

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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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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“…e importance of the blasting methods R 1 , surrounding rock conditions R 2 , cross angle R 3 , and clear distance R 4 to the optimal indicator I is compared on the basis of the published literatures [20,[31][32][33][34][35][36][37][38][39]. Combined with Saaty's scale table, the judgement matrixes are constructed as follows:…”

Section: Construction Of the Judgement Matrixmentioning

confidence: 99%

Researches on the Influence of Blasting of Newly Built Tunnel on the Existing Tunnel Structure with Small Cross Angle

Du¹,

Xiao

et al. 2021

Advances in Civil Engineering

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In recent years, with the increasement of the railway expansion projects, the blasting damage has caused great threat to the safety of the existing tunnel structure. However, few researches are carried out on the influence of tunnel blasting construction on existing small-angle crossing tunnel structure. In this study, the dynamic response of existing tunnel structure to the blasting activities in newly built tunnel is analyzed by numerical simulation. From the comparison of vibration velocity, lining stress, and the displacement of the existing tunnel structure, the blasting methods, surrounding rock condition, cross angle, and clear distance are proven to be the highly correlated factors for the dynamic response of the existing tunnel to blasting. Then, combined with the analytic hierarchy process, the vibration velocity is selected as the optimal index to indicate the dynamic response to blasting activities.

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“…In a tunnel affected by blast vibration waves, the dynamic stress of the structure is directly related to the peak vibration velocity (PPV) [20]. Xu [21] and Zhang [22] analyzed the effect of blast vibration waves on the safety of tunnel structures without considering the vibration frequency. However, the adverse effect of blast vibration waves is not only related to the vibration amplitude but also to the relationship between the dominant frequency of a blast vibration and the structural natural frequency.…”

Section: Introductionmentioning

confidence: 99%

Study on Dominant Frequency Attenuation of Blasting Vibration for Ultra-Small-Spacing Tunnel

et al. 2022

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The middle rock pillar in ultra-small-spacing tunnels is significantly narrow, and the stability of the primary support and lining are easily influenced by the blasting vibration wave from an adjacent tunnel. Therefore, understanding the vibration frequency characteristics is essential for the blasting vibration control. Based on the blasting works on a double-track roadway tunnel (Jiuwuji tunnel in Guizhou, China), this study investigates the dominant frequency attenuation in the preceding tunnel with the middle rock pillar spacing ranging from 4.0 m to 9.4 m. The results show that the ranges of the dominant frequency distributions on the primary support and lining are widely within 200 Hz, but there are varieties in their propagation laws. The distribution of the dominant frequencies on the primary support is broader than that on the lining; and the dominant frequencies are concentrated on a specific range when the lining is far from the blast face beside a particular value, which is not present on the primary support. As the presence of cavity and changing medium between the lining and the primary support, it made a significant contribution to the filtering the vibration waves. Furthermore, on the primary support, the high-frequency part of the vibration waves attenuates rapidly with distance, and then, the practical prediction equations describing dominant frequency attenuation were proposed. The comparison on frequency characteristics per delay for the millisecond delay blasting shows that multiple delay sequences blast contributes to a multi-structured amplitude spectrum of blast vibration waves; and the varies of the equivalent explosion sources dimensions and numbers of free surfaces in each blast delay resulting in diverse vibration waveforms. Finally, the dominant frequencies determined by different methods were compared, and the results show a nonlinear relationship between the ZCFs and DFs. The above research conclusion expands the understanding of blasting vibration in tunnel engineering, particularly in the frequency distribution.

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Dynamic response and safety control of civil air defense tunnel under excavation blasting of subway tunnel

Cited by 52 publications

References 20 publications

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

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

Researches on the Influence of Blasting of Newly Built Tunnel on the Existing Tunnel Structure with Small Cross Angle

Study on Dominant Frequency Attenuation of Blasting Vibration for Ultra-Small-Spacing Tunnel

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