My first Magazine dsi-info-23-en | Page 39

Underground—Global—Special—Tunneling In June 2015, load tests were conducted on those 10 samples. Type 20-23" BULLFLEX ® Support Pillars showed an average load- bearing capacity of approximately 580 kips (2,580kN). Pillars type 25-29" had an average load-bearing capacity of approximately 950 kips (4,225kN). The successful performance evaluation of BULLFLEX ® Support Pillars now forms the basis for a technical document that allows design firms and clients a fast and flexible choice of additional standing support systems wherever required. In November 2015, a second series of load tests was conducted on similar samples to verify both the support capacities and an improved yielding ability of the BULLFLEX ® Pillars. 39