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以类岩石材料模拟岩体,考虑主次多裂隙、等长多裂隙2类交叉多裂隙形式,制作含交叉多裂隙试件,对试件进行单轴压缩试验,研究含交叉多裂隙岩体在单轴压缩下的力学性能。研究表明:含2条交叉裂隙试件强度高于含单一裂隙试件,当裂隙数量超过2条(不含)时,含主次多裂隙试件峰值强度与含单一裂隙试件接近,含等长多裂隙试件的峰值强度及试件破坏所需外力功都低于含单一裂隙试件;次裂隙数量增加对含主次多裂隙试件强度影响不明显,裂隙数量增加对含等长多裂隙试件的强度降低作用非常明显;绝大部分含交叉多裂隙试件峰值强度对应的应变低于含单一裂隙试件;含主次多裂隙试件起裂应力高于含单一裂隙试件,大部分含等长多裂隙试件起裂应力低于含单一裂隙试件;含单一裂隙试件破坏面为剪切裂隙,含交叉多裂隙试件破坏面以张拉裂隙为主。
Rock-like materials are used to simulate rock mass. Two types of multi-fractures with major and minor fractures and equal length and multiple fractures are considered to simulate the rock mass. Cross-fractured specimens with cross-cracks are made and uniaxial compression tests are carried out on the specimens. Mechanical properties under uniaxial compression. The results show that the strength of specimen with two crossed fractures is higher than that of specimen with single fracture, and when the number of cracks is more than two (not included), the peak intensities of specimens containing primary and secondary fractures are close to that of specimens containing single fracture, including The peak strength of the long multi-fracture specimen and the external force required for the specimen failure are lower than those of the single fracture specimen. The increase of the secondary fracture number has no obvious effect on the strength of the specimens containing primary and secondary fractures. The strength of the cracked specimen is obviously reduced. The peak strain corresponding to most of the specimens with crossed multi-cracked specimens is lower than that of the specimens containing single cracked specimens. The specimens with the primary and secondary multi- Most of the cracks with equal length and multi-fracture specimens have a lower initiation stress than those with a single fracture specimen. The fracture surface with a single fracture specimen is a shear fracture, and the fracture surface with cross and multiple fracture specimens is dominated by tension and fracture.