论南海珊瑚淤泥的力学行为

Ting Yao, Ziwei Cao, Wei Li
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摘要

在珊瑚礁岛屿的填海造地过程中,大量淤泥状珊瑚土因离析和降解而形成。淤泥质珊瑚土的堆积并不罕见,但对珊瑚淤泥岩土特性的研究却非常有限。本研究对从中国南海一个填海珊瑚岛上获得的珊瑚淤泥的力学性能进行了系统的实验研究,并与从同一地区采集的珊瑚砂进行了比较。与珊瑚砂相似,珊瑚淤泥颗粒也因其自然来源而呈现出不规则的颗粒形状和颗粒内孔隙。根据极限含水量,珊瑚淤泥被归类为低塑性粘质淤泥。在一维压缩条件下,珊瑚淤泥的收敛速度比珊瑚砂快很多。在收敛之前,珊瑚淤泥的压缩性较高。收敛后,由于颗粒明显破碎,珊瑚砂的可压缩性变得更高。松散的珊瑚淤泥在低约束压力下受到不排水剪切时会表现出明显的应变软化行为,表明存在静态液化或流动破坏。珊瑚淤泥的临界状态和峰值摩擦角低于珊瑚砂,但远高于其他原生粘质淤泥。珊瑚淤泥的临界状态线呈弯曲状,在偏离应力-平均有效应力平面上有明确的水平渐近线,这再次表明其静态液化的可能性较高。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
On the mechanical behaviour of a coral silt from the South China Sea
During land reclamation on the reef islands, large amounts of silt-sized coral soils were created by segregation and degradation. The accumulation of silt-sized coral soils is fairy uncommon while the research on the geotechnical properties of the coral silt is very limited. In this study, a systematic experimental investigation on the mechanical behaviour of coral silt obtained from a reclaimed reef island in the South China Sea has been performed, with comparisons to the coral sand collected from the same area. Similar to the coral sand, the coral silt particles also exhibit irregular particle shape and intra-particle pore due to their nature origin. According to the limiting water contents, the coral silt is classified as a low-plasticity clayey silt. Under one-dimensional compression, the coral silt exhibits a much quicker convergence compared to coral sand. Prior to convergence, the compressibility of coral silt is higher. After yielding, the compressibility of coral sand becomes higher due to significant particle breakage. The loose coral silt subjected to undrained shearing at low confining pressures exhibits obvious strain softening behaviour, indicating static liquefaction or flow failure. The critical state and peak friction angles of coral silt are lower than those of coral sand but much higher than those of the other terrigenous clayey silts. A curved critical state line with well-defined horizontal asymptote in the deviatoric stress - mean effective stress plane is identified for coral silt, again indicating higher potential to static liquefaction.
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