相对密实度对沈阳砾砂峰值强度影响

Tests on the influence of the peak strength of the gravelly sand in Shenyang area considering different relative densities

为研究土体扰动过程中相对密实度与峰值强度的关系,针对沈阳地区砾砂,分别对不同相对密实度重塑样进行不同围压下的三轴固结排水剪切试验,得到砾砂Duncan-Chang模型的相关参数.随后,探讨了沈阳地区砾砂的峰值强度受相对密实度D_r的影响规律,并应用数学手段对过程参数M与D_r的关系进行拟合.结果表明:过程参数M与相对密实度D_r之间大致呈线性关系,以此建立砾砂峰值强度与相对密实度D_r的联系;而过程参数受到相对密实度D_r的影响很小,可近似认为l不随D_r变化.

It is obvious that the relative density Dr changes greater than other parameters of soils during the disturbance of excavation. The parameters of Duncan-Chang model are obtained according to the results of triaxial consolidation drained shear tests on the gravelly sands of different relative densities in Shenyang region under different confining pressures. Then, the influence rule between the peak strength and the relative density Dr are discussed. The fitting result shows that the relation between M which is a parameter related to and Dr is approximately linear. Then, the relation between and Dr is established. As well, it has little influence of l which is also a parameter related to and Dr by Dr. It means that, approximately, l does not change when Dr changes.