Numerical analysis of the stability of abandoned cavities in bench blasting
MetadataShow full item record
When open-pit bench blasting approaches a site with underground cavities, concerns arise regarding the safe blasting distance to prevent collapse of the cavities because such collapses may induce other secondary problems related to the safety and workability of the site. It is therefore necessary to estimate the stability of underground cavities in the proximity of bench blasting. In this paper, blasting tests of small scale were carried out in a site with cavities and field blasting test data were measured to obtain the site-specific attenuation relations of PPV and principal frequency of stress waves. A numerical model is then developed based on these relations to calculate bench blasting induced stress wave propagation. The accuracy of the numerical prediction is verified by the field measured data. The verified numerical model is used to perform a series of simulations. The results are then used to assess the roof stability of cavities adjacent to upper bench blasting. Based on the numerical results, the response characteristics of cavity roof with respect to different explosive charge mass are also studied.
Showing items related by title, author, creator and subject.
Study on the long-hole raising technique using one blast based on vertical crater retreat multiple deck shotsLiu, K.; Yang, J.; Li, X.; Hao, Hong; Li, Q.; Liu, Z.; Wang, C. (2018)Backfilling inaccessible cavity through raise can provide underground support for the active open-pit operations and the raise must be taken down in a single blast for safety reasons. Conventional raising techniques are ...
Chen, Wensu; Hao, Hong; Chen, Shuyang (2015)Prestressing technique has been widely used in civilian and military constructions. The prestressed reinforced concrete (RC) structural components such as beams and columns usually outperform the non-prestressed RC ...
Study on the raising technique using one blast based on the combination of long-hole presplitting and vertical crater retreat multiple-deck shotsLiu, K.; Li, X.; Hao, Hong; Li, X.; Sha, Y.; Wang, W.; Liu, X. (2019)© 2018 Elsevier Ltd This paper reports the further study carried out by the authors on the technique of long-hole raising in one blast. In the previous work reporting the results of preliminary study, method of vertical ...