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Abstract
The influence of unloading of overloaded prestressed anchor cables in underground caverns on overall stability is discussed in this paper, including the theoretical background on the reinforcement effect of anchor cables, and quantitative estimates from numerical modeling of the influences of anchor cable force unloading on rock mass deformation and forces in the other adjacent support systems. The numerical model shows the same results as the recording during the site unloading test: unloading the force of overloaded anchors by about 50-150 tonnes has limited influence on rock deformation, stress adjustment, the depth of the plastic zone in the rock mass, and the forces on the adjacent rock bolts and anchors. From the perspective of the overall stability of the underground caverns, unloading the force of the overloaded anchors can be another solution in addition to replacing the overloaded anchors with new ones to meet the requirements of the design standard.
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Schedule a callMore From: IOP Conference Series: Earth and Environmental Science
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