Strains Induced in Urban Structures by Ultra-High Frequency Blasting Rock Motions: A Case Study

Dowding, Charles H.; Hamdi, Essaïeb; Aimone-Martin, Catherine T.

doi:10.1007/s00603-016-0921-4

Cited by 13 publications

(6 citation statements)

References 1 publication

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“…The vibration causes deformations that produce strains and stresses in the structures. Several researchers have tried to correlate the induced stress developed by the particle velocity with the strength of the rock mass and the structure materials (Dowding et al, 2016; Gad et al, 2005; Ngo et al, 2007; Roy, 2013; Saedi, 2017; Yang, 2016). The overall damage in a residential structure is correlated with the in-plane distortion of the walls between the floors.…”

Section: Theory and Backgroundmentioning

confidence: 99%

Prediction of shear strain induced by blasting waves in surface structures based on coupled frequency, velocity, and displacement effects

Nateghi

Goshtasbi

Nejati

2020

Journal of Vibration and Control

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Blasting ground vibration is an undesirable side effect of using explosives to fragment rocks. There is not any universally accepted standard to determine limitations of blast vibrations; however, velocity is the most commonly used method to measure ground vibrations. Because the structural response is highly frequency dependent, the frequency content is an essential characteristic of blast-induced shock waves along with the velocity. The magnitude of blast-induced displacement or velocity and their relative stress and strain are directly related to the quantity of charge, distance from blasting point, and geological conditions. These effects were not considered in the response spectrum theory of structures. This article tries to propose a new procedure to predict the shear displacement and relative strain for optimization of blasting patterns before the explosion. It can be accomplished by representing the effects of both velocity and frequency on the horizontal displacement of the structures based on measurements undertaken by the authors in two different rock formations. In this study, collected data were analyzed statistically to determine the coupled effects of dominant frequency, peak particle velocity, and peak particle displacement to propose a simple procedure for predicting the range of blast-induced displacement and related strain in structures.

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Section: Theory and Backgroundmentioning

confidence: 99%

Prediction of shear strain induced by blasting waves in surface structures based on coupled frequency, velocity, and displacement effects

Nateghi

Goshtasbi

Nejati

2020

Journal of Vibration and Control

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“…Xie et al [6] conducted vibrational, acoustic, and numerical simulation tests on the vibration velocity threshold of foundation pit blasting. Dowding et al [7] studied the strain response characteristics of the urban structure under blasting excavation. Yankelevsky et al [8] studied the blasting resistance and response of reinforced concrete building structures under the terrorist threats of blasting in Israeli urban areas.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Response Characteristics of the Structures under Excavation by High-Efficiency Blasting in the Urban Ultradeep Foundation Pit

Lei

Chen²,

Zhao³

et al. 2020

Shock and Vibration

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To ensure the safe and efficient excavation of ultradeep foundation pits in a complex urban environment, the ultradeep foundation pit excavation project of Liuguangmen Urban Complex in Guiyang City was taken as the study point. A high-efficiency blasting method was proposed for the excavation of vibration-isolating slot and electronic detonators, and a three-dimensional spatial calculation model of the foundation pit structure was established. In addition, the field test and numerical simulation of the blasting vibration were developed. The feasibility of the high-efficiency blasting method was demonstrated, and the propagation law of the dynamic response characteristic parameters of the structure was explored using an electronic detonator and vibration-isolating slot. The results show that the electronic detonator carried out peak shaving within the group, unloading waves between the groups, and the blocking effect of the vibration-isolating slot, and all these effectively reduced the peak stress and peak particle vibration velocity, evenly distributed the vibration velocity, and guaranteed the safety of the surrounding existing buildings, proving the feasibility of the efficient blasting method. There is a “wall effect” at the supporting pile, whose propagation velocity is lower than that inside the rock mass, and the PPV is radial X > tangential Y > vertical Z. The peak values of stress, strain, and PPV all decrease with increasing supporting pile height, and there is an inflection point at 20 m. The internal nodes of the pile reciprocate without sharp change and failure in displacement. The peak displacement of different nodes is in the order X > Y > Z with increasing pile height, and the maximum peak value is 0.08 mm.

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“…In addition, 8 blasting tests at 10 points of the structure and foundation rocks of the structure were observed. The velocity at middle point of rocks during blasting was significantly higher than the normal value, and the strain of external wall was similar or slightly lower than the deformation of the masonry structure or materials for wall [8]. Minaev assessed the relationship between the blasting in dense sandstone and the stability of upper structure.…”

Section: Introductionmentioning

confidence: 99%

“…Displacement of section A-A along Z 8. Complexity generally attenuates from the tunnel wall to the internal structure of rock mass.…”

mentioning

confidence: 99%

Complex Modeling of the Effects of Blasting on the Stability of Surrounding Rocks and Embankment in Water‐Conveyance Tunnels

Zhou

et al. 2018

Complexity

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Blasting in water-conveyance tunnels that cross rivers is vital for the safety and stability of embankments. In this work, a tunnel project that crosses the Yellow River in the north district of the first-phase Eastern Line of the South-to-North Water Diversion Project was selected as the research object. A complex modeling and numerical simulation on embankment stability with regard to the blasting power of the tunnel was conducted using the professional finite difference software FLAC3D to disclose the relationships between the blasting seismic waves with vibration velocity and embankment displacement under different excavation steps. Calculation results demonstrated that displacement generally attenuated from the tunnel wall to the internal structure of rocks under the effect of blasting seismic waves. The tunnel wall was in tension, and tensile stress gradually transformed into compressive stress with increased depth into the rocks. The curtain-grouting zone was mainly concentrated in the compressive zones. For different excavation steps, the vibration velocity at different feature points was high at the beginning of blasting and then gradually decreased. The resultant displacement was relatively small in the early excavation period and slowly increased as blasting progressed. The effects of different excavation steps on the safety of surrounding rocks and embankment under blasting seismic waves were simulated. We found that the blasting-induced vibration velocity was within the safe range of the code and that the calculated displacement was within the allowed range. Numerical simulation was feasible to assess the safety and stability of engineering projects.

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Strains Induced in Urban Structures by Ultra-High Frequency Blasting Rock Motions: A Case Study

Cited by 13 publications

References 1 publication

Prediction of shear strain induced by blasting waves in surface structures based on coupled frequency, velocity, and displacement effects

Prediction of shear strain induced by blasting waves in surface structures based on coupled frequency, velocity, and displacement effects

Dynamic Response Characteristics of the Structures under Excavation by High-Efficiency Blasting in the Urban Ultradeep Foundation Pit

Complex Modeling of the Effects of Blasting on the Stability of Surrounding Rocks and Embankment in Water‐Conveyance Tunnels

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