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Effects of Salinity on the Compression and Shear Behavior of Offshore Gulf of Mexico Sediments

机译：盐度对墨西哥湾近海沉积物压缩和剪切行为的影响

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One-dimensional compression tests and triaxial shear were performed on two high plasticity resedimented clays from the offshore Gulf of Mexico: Ursa clay (liquid limit, w_L= 52 %) and Eugene Island Clay (w_L = 79 %). The resedimentation technique was used to prepare fully saturated samples of identical composition for laboratory testing at effective stresses ranging from 0.1 MPa to 85 MPa. For a given stress level, increasing pore fluid salinity causes a reduction in void ratio, compressibility and coefficient of lateral earth pressure at rest (Ko) but an increase in permeability. Increasing salinity has no discernible effect on the friction angle measured at critical state, but increases undrained strength at low effective stresses. These variations in properties are correlated to clay plasticity and mineralogy. Tests performed on specimens in which the natural salts had first been leached out and NaCl subsequently reintroduced showed little difference in measured properties.
机译：对来自墨西哥湾近海的两种高塑性重沉积粘土进行了一维压缩试验和三轴剪切：Ursa粘土（液体极限，w_L = 52％）和Eugene Island粘土（w_L = 79％）。再沉淀技术用于制备相同组成的完全饱和的样品，以在0.1 MPa至85 MPa的有效应力下进行实验室测试。对于给定的应力水平，增加孔隙流体的盐度会导致孔隙率，可压缩性和静止侧向土压力系数（Ko）降低，但渗透率会提高。盐度的增加对在临界状态下测得的摩擦角没有明显的影响，但是在低有效应力下增加了不排水的强度。这些性质的变化与粘土的可塑性和矿物学有关。在首先浸出天然盐然后再引入NaCl的标本上进行的测试显示，所测性能几乎没有差异。

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