Study on blasting characteristics of rock mass with weak interlayer based on energy field

Abstract

In order to explore the influence of weak interlayer on blasting characteristics in natural rock mass, by using the particle flow code (PFC2D), a single hole blasting numerical model of hard rock with soft interlayer is established. The blasting experiments at different positions and thicknesses of weak interlayer are carried out. Then an in-depth analysis from the perspectives of crack effect, stress field and energy field is made. Results showed that: (i) When the explosion is initiated outside the weak interlayer, if the interlayer is located within about twice the radius of the crushing area, the closer the interlayer is to the blast hole, the higher the damage degree of the rock mass around the blast hole. And the number of cracks will increase by about 1–2% when the distance between the weak interlayer and the blast hole decreases by 0.5 m. (ii) When detonating outside the weak interlayer, if the interlayer is within about 4 times radius of the crushing area, the hard rock on both sides of the weak interlayer will in a high stress state. Under the same case, the peak kinetic energy and peak friction energy will increase by about 23 and 13%, respectively, and the peak strain energy will increase by about 218 kJ for every 0.1 m increase in the thickness of the weak interlayer.

Study on Blasting Characteristics of Soft-Hard Rock Strata Based on Energy Fields and Particle Expansion Loading Algorithm

“…Finally, set the transmission boundary and apply the blasting load to the blasting point. The whole blasting process lasts for 20 ms, and the final blasting effect is shown in Figure 8(a) which is the same result gained by authors shown in the literature [35]. Under the same model size, rock mechanical properties and initial stress field, the result is basically consistent with that obtained by Yuan et al [31] (Figure 8(b)), which proves the rationality of the blasting method adopted in this paper.…”

“…The experimental comparison results are shown in Figures 5-7, which show that the parameters in Table 1 are accurate and reasonable. What is more, the results of the three tests are identical to those in the literature [35] which is obtained by Cui et al…”

“…Some previously reported data were used to support this study and are available at [doi:10.1038/s41598-022-17028y]. The prior study is cited at the relevant place within the text as the reference [35]. And other data used to support the findings of present study are included in the submitted article.…”

Study on rock mass failure characteristics of double-hole delayed blasting in interbedding based on particle expansion algorithm

“…(2) In addition to the verification of the analytical stress field in this paper, the numerical blasting method is also compared the final state of the crack network with the results of other scholars and the specific process is explained in detail in the reference of Cui et al (2022). Therefore, both methods prove the rationality of the blasting method used in this paper.…”

Research on the damage characteristics of rock masses based on double guide-hole blasting under high In-situ stress

“…At the practical application level, Yuan et al 9 studied the damage mechanism of the tunnel envelope under the coupling of vertical geostress and blasting load. Cui et al [10][11][12] analyzed the change law of high geostress soft and hard rock formations under blasting load from the levels of crack state, contact coefficient, and energy magnitude. Yang et al 13 studied the influence of geostress on the degree of blast energy decay from the perspective of blast energy decay; and with the help of borehole blasting excavation method, they found that dynamic stress redistribution after explosive blast is the most important factor leading to rock damage 14 .…”