巷道围岩变形破坏过程中锚固力的变化规律 English Version
Variation of anchoring force during the course of deformation and failure of surrounding rock
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摘要: 运用真三轴试验台，实现了锚杆支护大比例（１：４）模型试验。试验中反映出锚杆支护的围岩从开挖至失稳的全过程，即锚固围岩碎胀变形、锚固范围以外围岩碎胀变形及围岩失稳三个阶段。掌握了相应于各阶段锚固力上升、稳定、下降的变化规律，为设计锚杆支护提供了重要依据。提出可用锚杆载荷迅速下降作为围岩失稳的预警指标。Abstract: True triaxial experimental bench is creatively used to carry out bolting experiments on a large scale of 1:4,the whole course from excavation to failure of surrounding rock is found out ,that is,dilatancy deformation stage of rock within bolting range, dilatancy deformation stage of rock beyond bolting range,and rock failure stage. Variation law of anchoring force is grasped respectively during each stage,which is the scientific basis of bolting design.The rapid decrease of load on bolts may be used as an index to forecast the destabilization of surrounding rock.
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Keywords:
- surrounding rock /
- deformation course /
- anchoring force /
- variation law.
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