<p><span style="mso-ansi-language: EN-US;" lang="EN-US">The behavior of tunnels in anisotropic rock masses is highly complex and heavily dependent on the orientation of the tunnel axis with respect to the geostatic principal stress directions and to the rock structural planes. 2D solutions cannot capture the 3D face effects of such complex scenario; ...
Steel pipe umbrellas have been used to tunnel in difficult conditions or in weak rock masses and/or soils. Despite
the large number of applications around the world, there are still some doubts concerning how pipe umbrellas behave under
loading when the tunnel face advances. For this reason, a scale laboratory model of pipe umbrella reinforced tunnel
Deposit formation back analysis of a two-year iron ore slime impoundment managed by the sub-aerial method is
performed using two complementary approaches. The first one tries to identify the deposit stratigraphy and its formation
history. This is made possible through sorted document review (reports, design documents, personal communication,
photos, etc.) and...
The main purpose of this paper is to study the effect of annulus thickness on the quality of resin mixture for fully
grouted resin bolt. Pullout and mixture tests were made in underground coal mines for the following arrangements: (a) 29
mm borehole diameter, and 19 mm roof bolt diameter with steel wire around the roof bolt; (b) 29 mm borehole diameter,