A new calculation model of blasting damage degree—Based on fractal and tie rod damage theory

Xu, Xiaoding; He, Manchao; Zhu, Chun; Lin, Yun; Cao, Chen

doi:10.1016/j.engfracmech.2019.106619

Cited by 52 publications

(19 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As shown in Figure 5, σ 0 is the initial peak stress value of the incident layer of the stress wave, and σ max is the peak stress value after passing through the nlayer medium. e peak stress σ max after n-layer medium can be obtained from [19] the following equation:…”

Section: Attenuation Of Stress In Blasting Crackmentioning

confidence: 99%

Study on Stress Relief of Hard Roof Based on Presplitting and Deep Hole Blasting

Gong

Chen

et al. 2020

Advances in Civil Engineering

View full text Add to dashboard Cite

For the problem that the hard roof causes wider end-mining coal pillar, and the roadway is greatly affected by mining, this paper took Shanxi Luning Coal Mine as the engineering background; based on the stress distribution characteristics of the coal pillar, the calculation method of the limit end-mining coal pillar size was given; considering the formation conditions and transmission forms of the advanced abutment stress, a method combining presplitting and deep hole blasting was proposed to weaken the advanced abutment stress. The numerical simulation was used to analyze the stress distribution of coal pillars, which was verified by on-site industrial tests. The results showed that the presplitting can achieve the blocking of stress. The closer it is to the peak of the abutment stress, the better the blocking effect. Deep hole blasting can weaken the source of the advanced abutment stress and reduce the peak of abutment stress. With the combination of the two blasting methods, the end-mining coal pillar size of Luning Coal Mine can be reduced to 60 m. The method combining presplitting and deep hole blasting can effectively reduce the end-mining coal pillar size and reduce the impact of mining on the deformation of the dip roadway.

show abstract

Section: Attenuation Of Stress In Blasting Crackmentioning

confidence: 99%

Study on Stress Relief of Hard Roof Based on Presplitting and Deep Hole Blasting

Gong

Chen

et al. 2020

Advances in Civil Engineering

View full text Add to dashboard Cite

show abstract

“…The impact dynamic load formed in the process of roof collapse in the goaf and the squeezing effect between the 2 Lithosphere collapsed gangue often have an adverse impact on the maintenance of the gangue rib [16][17][18]. Especially under the condition of deep high-stress mining, the traditional I-shaped steel retaining has a high failure rate, low recovery rate, and poor supporting effect [19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Research on Mechanical Properties of U-Shaped Retractable Gangue Prevention Structure of Gob-Side Entry by Roof Cutting and Pressure Releasing in Deep Mining

et al. 2022

View full text Add to dashboard Cite

In recent years, as a new type of gob-side entry retaining method, roadway automatically formed by roof cutting and pressure releasing (RAFRCPR) has been widely used in China. Under the condition of deep mining, the deformation of the gangue rib of the automatically formed gob-side entry retaining is difficult to control, and it is difficult for the traditional I-shaped steel to provide the needed support. To effectively control the deformation of the gangue rib, a new type of U-shaped retractable gangue prevention structure (URGPS) with high lateral support strength and axial compressible dynamic absorption energy is proposed. Based on the geological conditions of the 21304-working face in the Chengjiao coal mine in Henan, the mechanical characteristics of URGPS and the causes of its local instability are analyzed in detail employing theoretical analysis, laboratory tests, and numerical simulation. A reasonable bolt tightening force, overlap length, and lap combination form of the URGPS are determined according to the actual situation of the project site. Engineering practice shows that a URGPS that was applied to control the deformation of the gangue rib in deep roof-cutting roadway was effective.

show abstract

“…By integrating the Hilbert spectrum, the energy spectrum could be well obtained, which can be used to analyze the energy distribution of vibration signals varied with time and frequency. It breaks the limitation of the uncertainty principle and can accurately express all kinds of information on the time-frequency plane [22,23].…”

Section: Introductionmentioning

confidence: 99%

Blasting Vibration Signal Transform in Geotechnical Engineering Applied HHT and S Transform for Time-Frequency Analysis

Man

Song

Liu

et al. 2022

Shock and Vibration

View full text Add to dashboard Cite

Based on the same blasting vibration signal, the S transform and HHT method have been applied for the time and frequency analysis. Both the S transform and HHT method are analyzed and compared from the point of decomposition path and analysis function. It expressed that these two methods are complete and effective and have the characteristics of adaptive multiresolution. Especially, the time resolution of the HHT method is invariable and its accuracy is high. Moreover, its frequency resolution can be adaptively adjusted with the inherent characteristics of the signal. However, the time and frequency resolution of the S transform are limited by the uncertainty principle, and the resolution improvement is at the cost of reducing the resolution of another. Furthermore, the HHT method has much more adaptability and is superior to S transform in the analysis of nonstationary signals. In advance, the waveform curve and power spectral density of each detonator are extracted, which indicates that it is not scientific to use different segment detonators for the same circle of the auxiliary hole. Under the premise of the same charge quantity, the vibration energy peak value produced by the same segment detonator is less than that of several segments of detonators. Therefore, it is believed that the HHT method has broad application prospects in the study of wave propagation, attenuation law, structural dynamic response characteristics, and blasting vibration damage in rocks.

show abstract

A new calculation model of blasting damage degree—Based on fractal and tie rod damage theory

Cited by 52 publications

References 16 publications

Study on Stress Relief of Hard Roof Based on Presplitting and Deep Hole Blasting

Study on Stress Relief of Hard Roof Based on Presplitting and Deep Hole Blasting

Research on Mechanical Properties of U-Shaped Retractable Gangue Prevention Structure of Gob-Side Entry by Roof Cutting and Pressure Releasing in Deep Mining

Blasting Vibration Signal Transform in Geotechnical Engineering Applied HHT and S Transform for Time-Frequency Analysis

Contact Info

Product

Resources

About