粗粒料剪胀性影响因素分析研究

An Analysis on Influencing Factors of Shear Dilatancy of Coarse-grained Soil

利用前人所做常规三轴试验成果及3种不同密度CID试验和CK0D试验成果,探讨围压、母岩性质、密度及应力路径等因素对粗粒土剪胀性的影响。结果表明:低围压下,粗粒土表现出明显的剪胀趋势,随着围压的增大,剪胀性逐渐减弱,逐渐向剪缩过度;破坏剪胀率与围压之间近似呈幂函数关系;母岩较硬的粗粒土表现出更强的剪胀性;粗粒土的剪胀性随着密度的增加线性增加;相同围压下,粗粒土在K0固结条件下较等压固结条件下剪胀趋势明显。

Using the results of triaxial tests and results of CID tests and CK0D tests of three kinds of coarse-grained soils of former researchers, this paper discusses the effect of influencing factors such as confining pressure, mother rock property and density, stress path, and so on. The results show that the coarse-grained soil shows shear dilatancy under low confining pressure, which was gradually weakened with the increase of confining pressure and gradually transformed shear contraction. The failure dilatation ratio and confining pressure indicate power function. The dilatancy of coarse-grained soil of hard mother rock is more obvious. The dilatation of coarse-grained soil increases linearly with the density increase. Under the same confining pressure, the dilatation of coarse-grained soil under the K0-consolidated condition is more evident than under isotropically consolidated condition.