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首页> 外文会议>Advances in Geotechnical Engineering: The Skempton Conference vol.1 >Influence of Cement Type on G_o of a Carbonate Sand
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Influence of Cement Type on G_o of a Carbonate Sand

机译：水泥类型对碳酸盐砂G_o的影响

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A new setup was developed to enable measurement of shear (V_s) and compression (V_p) wave velocities (and hence G_o and Mo) under K_o conditions for reconstituted geomaterials. Any of V_s or V_p may be measured from elastic waves propagating either horizontally or vertically. The system has two particular advantages for horizontally propagating waves. First, the shear wave transducers accessed the sample externally. Second, they can be rotated in the vertical plane, so that V_s can be measured in any skew plane. The setup was used to investigate the influence of cement type on the small-strain stiffness of a carbonate sand, treated with four different cementing agents, namely calcite, Portland cement, gypsum and epoxy. The aspects investigated due to the cementation were: (1) the overall evolution of G_o, (2) the shear stiffness anisotropy, and (3) the influence of vertical stress (δ_v) on G_o. The study shows that the type of cement can have a substantial effect on the stiffness anisotropy. For example while the calcite removed the initial stiffness anisotropy of the untreated soil, both Portland cement and epoxy reversed the stiffness anisotropy; and the gypsum cement increased the initial stress-induced anisotropy. These findings have important implications in modeling naturally or artificially cemented soils.
机译：开发了一种新的设置，以能够在重构土工材料的K_o条件下测量剪切（V_s）和压缩（V_p）波速（以及G_o和Mo）。 V_s或V_p中的任何一个都可以根据水平或垂直传播的弹性波来测量。该系统对于水平传播波具有两个特别的优点。首先，剪切波传感器从外部进入样品。其次，它们可以在垂直平面中旋转，从而可以在任何倾斜平面中测量V_s。该装置用于研究水泥类型对碳酸盐砂的小应变刚度的影响，并用方解石，硅酸盐水泥，石膏和环氧树脂这四种不同的胶结剂进行处理。由于胶结作用而研究的方面是：（1）G_o的整体演变，（2）剪切刚度各向异性，以及（3）垂直应力（δ_v）对G_o的影响。研究表明，水泥类型可以对刚度各向异性产生实质性影响。例如，当方解石消除了未经处理的土壤的初始刚度各向异性时，波特兰水泥和环氧树脂都使刚度各向异性发生了逆转。石膏水泥增加了初始应力引起的各向异性。这些发现对于模拟天然或人工胶结的土壤具有重要意义。

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