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随着土石坝的发展,粗粒土的使用日益广泛。但是对这类土的试验工作,因受到仪器尺寸的限制,试料并不完全反映实际用料,许多资料表明,研究者正在通过各种途径解决这一矛盾,例如加大仪器尺寸,模拟粒径,或进行原位试验等等。然而,目前仍处于研讨阶段。近年来,我们结合土石坝工程实践,对一些粗粒土(包活砂砾石、石碴、碎石土等)曾用大型三轴仪,大型直剪仪以及现场挤压法等方法,进行了试验研究,在此基础上,笔者推荐一种“用推滑平衡分析法”确定粗粒土抗剪强度指标。现将该方法介绍如下。
With the development of earth-rock dams, the use of coarse-grained soils has become increasingly widespread. However, due to the limitations of the size of the instrument, the test of such soils does not fully reflect the actual materials. Many data indicate that the researchers are solving this contradiction through various means, such as increasing the size of the instrument and simulating particles. Trails, or in-situ tests, etc. However, it is still in the research stage. In recent years, combined with the practice of earth-rock dam engineering, we have conducted large-scale triaxial instruments, large-scale direct shears, and in-situ extrusion methods on some coarse-grained soils (including live sand, gravel, crushed stone, and gravel). Based on the experimental study, based on this, the author proposes a method for determining the shear strength of coarse-grained soil using push-slip balance analysis. The method is described below.