![In underground face blasting, the pull is found to be 10% less](https://www.gkseries.com/blog/wp-content/uploads/2023/10/In-underground-face-blasting-the-pull-is-found-to-be-10-less.jpg)
Q. In underground face blasting, the pull is found to be 10% less than the drillhole length. The headings of 3.6 m width are supported by prop density of 1.44/m2. The hole length is 1.5 m, and 6 rounds of blasting are done in the panel per shift. The number of props to be erected in a shift is .