基于原位十字板强度的沿海地区软黏土超固结比分析

发布时间：2018-04-23 12:06

本文选题：土力学 + 软黏土　；参考：《岩石力学与工程学报》2017年10期

【摘要】：超固结比OCR是评价软黏土变形和强度特性的重要参数。基于天津、上海、连云港、深圳、中山和珠海这6个沿海地区软黏土的原位十字板强度,系统地分析这些地区软黏土的固结状态,并探讨其形成机制。研究结果表明:(1)基于原位十字板强度得到的OCR要明显大于室内一维压缩试验的结果,室内压缩试验会显著低估沿海软黏土的OCR;(2)6个地区的OCR随深度的变化规律较为一致,OCR随深度增加,逐渐减小至某一稳定值,浅层均表现出一定的超固结现象,而深层的固结状态则表现出一定的复杂性;(3)现有模型能够解释我国沿海软黏土超固结的成因以及变化规律,浅部的超固结现象源于以风化胶结为主的"表层作用",而深部的超固结则源于次压缩。考虑到软黏土突出的取土扰动问题,这种基于原位十字板强度的软黏土OCR评价及成因分析方法值得在我国沿海地区推广。
[Abstract]:OCR is an important parameter to evaluate the deformation and strength characteristics of soft clay. Based on the in-situ cross plate strength of soft clay in Tianjin, Shanghai, Lianyungang, Shenzhen, Zhongshan and Zhuhai, the consolidation state of soft clay in these areas is analyzed systematically and its formation mechanism is discussed. The results show that the OCR based on the strength of the in-situ cross plate is obviously larger than that of the in-room one-dimensional compression test. Indoor compression test can significantly underestimate the OCR of coastal soft clay in 6 areas. The variation law of OCR with depth is consistent with the depth, and gradually decreases to a certain stable value, and the shallow layer shows a certain phenomenon of overconsolidation. However, the deep consolidation state shows a certain complexity. The existing model can explain the causes of the overconsolidation of soft clay along the coast of China and its changing law. The phenomenon of overconsolidation in shallow part originates from the "surface action" which is dominated by weathering and cementation, while the superconsolidation in deep part is derived from subcompression. Considering the problem of soil disturbance caused by the outburst of soft clay, this method of OCR evaluation and genetic analysis of soft clay based on in-situ cross plate strength is worth popularizing in coastal areas of China.
【作者单位】：同济大学地下建筑与工程系;绍兴文理学院土木工程学院;
【基金】：国家自然科学基金资助项目(40702051) 浙江省公益技术应用研究计划项目(2016C33052) 绍兴市公益技术应用研究计划项目(2015B70034)~~
【分类号】：TU411.5

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