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为了研究坝体在地震时的稳定性,必须知道坝体中填筑材料在动、静荷载作用下的各种力学参数。为此,研制了一种能做试件直径为36厘米,高为80厘米,材料最大粒径为7厘米的大型三轴剪切试验机。试验证明,粗粒材料的动载剪切特性与等效弹性模量、滞后衰减常数有关,而它们又受侧压、空隙比与应变等因素所控制。通过数十种材料的剪切试验,取得了大量数据,得到了一些有规律件的结论。
In order to study the stability of the dam during the earthquake, we must know various mechanical parameters of the filling material in the dam under dynamic and static loads. For this purpose, a large-scale triaxial shear tester capable of making test pieces with a diameter of 36 cm, a height of 80 cm and a material maximum size of 7 cm has been developed. The experimental results show that the dynamic shear characteristics of coarse-grained materials are related to the equivalent elastic modulus and lagging attenuation constant, which are controlled by lateral pressure, void ratio and strain. Through dozens of materials, shearing test, obtained a large number of data, got some regular pieces of the conclusion.