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RISEstimation of Shaft Radial Displacement beyond the Excavation Bottom before Installation of Permanent Lining in Nondilatant Weak Rocks with a Novel Formulation
Publisher: American Society of Civil Engineers
Abstract: The convergence-confinement method (CCM) applies to circular tunnels in in situ stress fields in which all three principal stresses are equal and the rock mass exhibits elastic-perfectly plastic shear failure. As radial ...
New Equations for Estimating Radial Loads on Deep Shaft Linings in Weak Rocks
Publisher: American Society of Civil Engineers
Practical Method for the Design of Pretensioned Fully Grouted Rockbolts in Tunnels
Publisher: American Society of Civil Engineers
Abstract: This study develops an analytical approach to quantitatively model the efficiency of the pretensioning of grouted rockbolts in terms of reduction of tunnel convergence. In this study, the distribution of force along the ...
Effect of Gravity of the Plastic Zones on the Behavior of Supports in Very Deep Tunnels Excavated in Rock Masses
Publisher: American Society of Civil Engineers
Abstract: The vertical load acting on a support structure is affected by the loss of self-bearing capacity of the rock inside the plastic zone. This load can then be accounted for by analytical calculation methods capable of evaluating ...
Theoretical Estimation of the Drilling Rates Comparing the Evans and Nishimatsu Models in Relation to the Offshore Piles
Publisher: American Society of Civil Engineers
Abstract: Driven piles are the main foundation system for offshore oil and gas facilities. They are installed through the jacket legs or at the bottom of the structure. Driven piles can, however, experience premature refusal. In ...