Burden to spacing ratio
WebJan 24, 2024 · In general, the spacing to burden ratio varies between 1 and 2 . but the optimal spacing to burden ratio was 1.15 for staggered pattern an d 1.25 for rectangular . pattern (Hagan, 1983). WebFeb 23, 2024 · Furthermore, design parameters were considered delay interval, specific charge, stemming, the burden to spacing ratio, blast ability index, and hole diameter. Table 11.3 presents input and output ... trained an ANN model to determine burden, spacing, and total charge weight in the blast pattern based on the desired vibration from …
Burden to spacing ratio
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WebJul 22, 2024 · Monjezi et al. after conducting a series of analyses, mentioned that several parameters such as burden-to-spacing ratio and number of blasting rows are the most effective parameters on rock fragmentation. Ebrahimi et al. suggested a new model based on artificial bee colony (ABC) and ... WebJun 2, 2015 · In this short video, Anthony Konya will explain what stiffness ratio is and how to calculate stiffness ratios. Stiffness Ratio was first developed by Dr. Calvin Konya as a means to classify benches. As time …
WebVoid ratio required for rock swell = 30 - 50%: Max distance from blast hole to void hole in cut = 2.5 x Void hole diameter (≤ 0.5 m) ... Reduce drill burden/spacing's from outer … WebJan 4, 2024 · The best suited combination of burden-spacing from the analysis is presented in Table 5. The stope height of 20 m was charged up to 14 m to achieve the result. The mean fragment size of the rock was 200 mm and the 90% passing size of the fragment was 500 mm. The ratio of spacing to burden was 1.05 in the optimized …
WebBLAST DESIGN 225 Figure 19-10.—Isometric view of a bench blast. free face, the original square drilling pattern has been transformed to a staggered blasting pattern with a spacing twice the burden. The three simple patterns discussed here account for nearly all the surface blasting. Burden Figure 19-10 is an isometric view showing the relationship of … WebBurden to spacing ratio from 0.8 to 1.2 is appropriate for wall-control blasting. Weak planes act as free faces and its position determine amount of back break. Limits for …
WebJan 20, 2024 · Therefore, predicting and subsequently optimising back break shall reduce their problems to some extent. In this paper, an attempt is made to predict back break using the random forest method. The variables used for the study was such as burden to spacing ratio, stemming to hole-depth ratio, p-wave velocity and the density of explosive.
WebSpacing is a function of burden. For most situations, the spacing to burden ratio is between 1 and 2. In general, a ratio of 1:4 is used as an ideal geometric balance for breakage of massive material (Hagan,1983; Mishra, 2009). According to Bhandari (1997), the drillhole depth depends on the type of rock to be blasted. In a rock cvs bancroft pharmacy hoursWebThe burden-to-spacing ratio for smooth blasting is approximately 1.5 to 1. Hole spacing for smooth blasting is slightly greater than presplit blasting, about 14 to 20 times the hole … cvs bancroft pharmacyWebFeb 5, 2024 · The burden rate is the dollar amount of burden (i.e., overhead) that is applied to one dollar of wages. For example, if the annual benefits and payroll taxes associated … cheapest holiday cardsWebThe equations for determining the burden, spacing, and stemming require that we know the blast hole diameter. So, looking at the diameter of the hole is a good first step. ... And so, using “real-world" data for powder factor … cheapest hoka shoes for womenWebRespectively, burden and spacing in iron ore drill are 6 m and 7 m for 251 mm diameter Fig. 1. No displacement and having toe problem in the designed pattern based on with spacing to burden (S/B) ratio of 1.17. cheapest holiday accommodation sunshine coastWebFeb 23, 2024 · Burden (B) = (25–40) × D; Spacing (S) = 1.15 × B; Subdrill = (3–15) × D; Charge length (C) ≥ 20D; Stemming ≥ 20 × D or (0.7–1.2) × B; and. Stemming material … cheapest hoka running shoesWebBurden. The distance between rows of blastholes parallel to the major free face or the amount of rock directly in front of a blasthole at the time of initiation. ... Spacing. The … cheapest holiday cards for a business