Jiangxi Traffic Engineering Group Construction Co., Ltd
本文通过对有锚固作用和无锚固作用的不同角度层理砂岩进行单轴压缩试验，研究了层理砂岩的强度特征、变形特征和破坏模式，得到了层理砂岩的能量耗散特征和能量传递规律。结果表明：有锚层理砂岩抗压强度均大于无锚层理砂岩，随着层理角度的增加，砂岩抗压强度先增大后减小；有锚层理砂岩弹性模量和泊松效应均小于无锚层理砂岩，无锚与有锚层理砂岩破坏模式相似，在砂岩层理角度由0°到60°增大过程中，其破坏模式由脆性劈裂破坏转变为沿层理弱面剪切破坏；相同层理角度砂岩，有锚砂岩耗散能均大于无锚砂岩，锚固作用提高了层理砂岩的稳定性；随着层理角度的增加，弹性应变能和耗散能均表现为先增后减，压密阶段能量耗散率 d高于能量存储率 s，弹性阶段及塑性阶段能量存储率 s高于能量耗散率 d；无锚砂岩耗散能增长率W'd曲线具有波动性，而有锚砂岩耗散能增长率W'd曲线波动性很小，并且增长曲线比无锚层理砂岩更为圆滑。
In this paper, the strength characteristics, deformation characteristics and failure patterns of stratified sandstones at different angles with and without anchoring were studied, and the energy dissipation characteristics and energy transmission laws of stratified sandstones were obtained.The results show that the compressive strength of the anchored sandstone is greater than that of the anchorless sandstone, and with the increase of the stratigraphic angle, the compressive strength of the sandstone increases first and then decreases.The elastic modulus and Poisson effect of anchored sandstone are both smaller than those of anchorless sandstone, and the failure mode of anchorless and anchored sandstone is similar, and in the process of increasing the lamina angle of sandstone from 0° to 60°, the failure mode is changed from brittle cleavage failure to shear failure along the weak surface of stratigraphy;The dissipation energy of the sandstone with anchored sandstone is greater than that of anchorless sandstone with the same stratigraphic angle, and the anchoring effect improves the stability of stratigraphic sandstone;With the increase of the layer angle, the elastic strain energy and dissipative energy are shown to increase first and then decrease, the energy dissipation rate in the compaction stage is higher than the energy storage rate, and the energy storage rate in the elastic stage and the plastic stage is higher than the energy dissipation rate;The growth curve of the dissipative energy of anchorless sandstone is volatile, while the growth rate curve of dissipative energy of anchored sandstone is very volatile, and the growth curve is more sleek than that of anchorless stratified sandstone.
刘武,徐志华,彭爱红,等. 单轴作用下锚固层理砂岩力学性能与能量演化研究[J]. 科学技术与工程, , ():复制