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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。
The use of true triaxial test bench, to achieve a large proportion of bolt support (1: 4) model test. The test reflects the whole process of rock surrounding the rock bolt from excavation to instability, ie, the deformation and deformation of the anchoring rock mass, the deformation and the rock instability of surrounding rock outside the anchoring area. Mastered corresponding to the various stages of anchoring force rise, stability, decline of the law for the design of bolt support provided an important basis. It is suggested that the bolt load can be rapidly decreased as an early warning indicator of rock instability.