The large deformation of soft rock tunnel is one the key problems to be overcome in construction stage. In present study, mechanism a representative and some related countermeasures are investigated using field tests engineering geological analysis. Owing scarce performances methods based on other criteria such as small pipe spacing, anchor bolt length steel frame new support scheme implemented...

The experiments of Forbes and his associates (5) ^ at the Ohio Agricultural Experiment Station defined in a very complete fashion the relative efficiency of several mineral compounds as calcium supplements in swine nutrition. The minerals tested included limestone floats, precipitated bone flour, special steamed bone flour, rock phosphate floats, and precipitated calcium carbonate. As compared ...