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层状岩体加卸荷条件下的各向异性规律对于指导工程设计、施工具有重要意义。对含显著沉积弱面的水平、垂直层理的宜昌砂岩加载、卸载破坏的试验研究表明:1)水平、垂直层理砂岩回弹值、纵波波速与强度存在一定的相关性,其基本规律是回弹值或者纵波波速越大,岩体强度越大;2)无论采用加载还是卸载破坏方式,相同围压下,垂直层理岩体的强度一般大于水平层理岩体;3)无论是水平还是垂直层理岩体,卸荷破坏峰值强度在低围压下高于加载破坏强度,而高围压下低于加载破坏强度;4)该文试验条件下,加卸载破坏形式主要是剪切破坏,根据Mohr-Coulomb准则预测的破坏角和实测值非常接近,水平和垂直层理岩体加卸载破坏的破裂面并未受到沉积弱面的影响。
The anisotropy law under the condition of loading and unloading of layered rock mass is of great significance for guiding engineering design and construction. The experimental study on loading and unloading failure of Yichang sandstone with horizontal and vertical stratification with obvious depositional weakness shows that: 1) There is a certain correlation between springback value and longitudinal wave velocity and strength of horizontal and vertical sandstone, the basic law is The greater the rebound value or the longitudinal wave velocity, the greater the strength of the rock mass; 2) the strength of the vertically stratified rock mass is generally greater than that of the horizontal bedding rock mass under the same confining pressure, irrespective of whether the loading or unloading failure modes are used; 3) Or vertically stratified rock mass, the peak strength of unloading damage is higher than the loading failure strength under low confining pressure and lower than the loading failure strength under high confining pressure; 4) Under the test conditions, the unloading failure mode is mainly shear According to the Mohr-Coulomb criterion, the failure angle predicted is very close to the measured value. The rupture surface damaged by unloading and unloading of horizontal and vertical bedding rock mass is not affected by the weak surface of sedimentation.