Experimental Study on Vibration Reduction Technology of Hole-by-Hole Presplitting Blasting

Ma, Jun; Li, Xianglong; Wang, Jianguo; Tao, Zihao; Zuo, Ting; Li, Qiang; Zhang, Xiaohua

doi:10.1155/2021/5403969

Cited by 35 publications

(14 citation statements)

References 30 publications

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“…According to Eq. 32, the value of b can be determined according to the thickness of the foundation strata (D), and the corresponding slope angle (β) and the ultimate pile height can be obtained (Li et al, 2017b;Zheng et al, 2020;Ma et al, 2021). Physical and mechanical properties of the foundation strata are given in Table 1 (Jiang et al, 2020;Wang L J et al, 2021).…”

Section: Influence Of Different Foundation Lithology and Thickness On...mentioning

confidence: 99%

Bearing Capacity Calculation of Soft Foundation of Waste Dumps—A Case of Open-Pit Mine

et al. 2022

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For a waste dump with soft foundation, the foundation bearing capacity has an important impact on slope stability. According to the load distribution and stress characteristics of a waste dump, combining the gravity load of the triangular slope of the waste dump and the passive Earth pressure exerted by the foundation soil with an improved Plandtl formula, the foundation bearing capacity and the ultimate pile height of a waste dump are calculated and determined. The concept of foundation bearing capacity of a waste dump is redefined, that is, the ultimate pile height corresponding to a certain slope angle. A method for determining the ultimate pile height of a waste dump based on the slope angle of the waste dump is proposed, and the relation function between dump slope angle and waste height is established. The results show that the sliding moment increment (∆MS) caused by the gravity load of the triangular slope after waste increase is positively proportional to the pile height increment (∆H); the anti-sliding moment increment (∆MAS) is positively proportional to or positively correlated with the pile height increment (∆H); the slope angle of the waste dump decreases with the increase of the thickness of soft bedrocks, and the smaller thickness of soft bedrocks is more favorable to the ultimate pile height of the waste dump. The research results can provide reference for the calculation of the bearing capacity of soft foundation and the optimal design of slope shape of waste dumps.

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Section: Influence Of Different Foundation Lithology and Thickness On...mentioning

confidence: 99%

Bearing Capacity Calculation of Soft Foundation of Waste Dumps—A Case of Open-Pit Mine

et al. 2022

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“…The instrument used is model TST-70 permeameter of the Nanjing soil instrument factory. The mineral composition is determined by Malvern Panalytical's X'Pert³ X-ray diffractometer (Wang, et al, 2021;Ma, et al, 2021). The potential of hydrogen (pH) value is determined by the potential method.…”

Section: Test Materialsmentioning

confidence: 99%

Prediction of Matrix Suction of Unsaturated Granite Residual Soil Slope Based on Electrical Conductivity

et al. 2022

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To study the relationship between matrix suction and conductivity in unsaturated granite residual soil and realize the matrix suction prediction of soil slope based on conductivity, laboratory and field tests are carried out on undisturbed soil at different depths of the Yandou village landslide in Sanming City, Fujian Province, China. Through physical and chemical property analysis, soil-water characteristic curves and electric parameter matrix suction prediction models for unsaturated granite residual soil at different depths of the target area are obtained. Based on the proposed model, the matrix suction distribution of on-site soil slope is predicted and the dynamic response law under the influence of artificial rainfall is studied. The results show that: (1) The transverse conductivity, average structure factor, average shape factor, and anisotropy coefficient of unsaturated soil are related to the soil saturation degree. By considering the above parameters, the comprehensive structure parameter Re is introduced and its functional relationship with matrix suction is established. (2) Under artificial simulated rainfall, the saturation, hysteresis of the conductivity parameters, and matrix suction response of the slope occurs, which is controlled by soil depth, permeability and rainfall intensity. The matrix suction is distributed in layers on the profile and its recovery rate is slower than saturation. The suction contour map shows a parabola shape with the opening downward. (3) The relationship between the conductivity parameters of the residual soil slope and matrix suction is further revealed and a new method to indirectly measure matrix suction is proposed. Its feasibility is verified based on field tests, which is of great significance to landslide monitoring and early warning.

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“…Based on the law of dust pollution, this paper provides a basis for the design of reasonable parameters of dustproof net and related parameters of remote mist emitter (Huang et al, 2019a;Zhang et al, 2021a). Based on the blasting theory and empirical formula, the parameters of presplitting blasting such as the hole diameter, hole spacing, charge decoupling coefficient, and line charge density were determined, and field tests of conventional presplitting blasting and presplitting blasting with precise delay and hole-by-hole initiation were carried out on the west slope of Buzhaoba (Mussa et al, 2017;Mussa et al, 2018;Ma et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation Study on Dust Suppression Mechanism of Burning Rock Blasting in Open-Pit Mine

et al. 2022

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In an open-pit mine in Xinjiang, part of the stripped area is covered by burnt rock. Due to the low strength and fragility of burnt rock, dust is more easily generated during blasting. Taking the mining area as the research background, the mechanical property parameters of burnt rock were tested, and the blasting parameter design of on-site operation was understood. The blasting numerical simulation of burnt rock step was carried out by using a numerical simulation software (LS-DYNA). From the angle of stress on rock, the stress cloud and stress curve of numerical simulation are analyzed, and it is concluded that the fundamental reason for the large dust production in blasting operation is that the burnt rock is crushed excessively after the action of explosion wave, and the explosive energy is too large, which is converted into kinetic energy to drive the dust to escape. In order to improve the utilization rate of explosives and reduce the output of blasting dust, the original blasting parameters were optimized as 8-m hole spacing, 6.5-m row spacing, 0.21-kg/m³ unit explosive consumption, 1-m interval charge, and 55-ms short-delay blasting through numerical simulation and orthogonal experiment. In the mining area, the measures of dustproof and dust reduction by blasting protection blanket and dust absorption cotton are adopted. Combined with the optimized blasting parameters, the field test proves that the dust removal efficiency is up to 82.4%.

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Experimental Study on Vibration Reduction Technology of Hole-by-Hole Presplitting Blasting

Cited by 35 publications

References 30 publications

Bearing Capacity Calculation of Soft Foundation of Waste Dumps—A Case of Open-Pit Mine

Bearing Capacity Calculation of Soft Foundation of Waste Dumps—A Case of Open-Pit Mine

Prediction of Matrix Suction of Unsaturated Granite Residual Soil Slope Based on Electrical Conductivity

Numerical Simulation Study on Dust Suppression Mechanism of Burning Rock Blasting in Open-Pit Mine

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