重塑黏土空心圆柱试样制备技术改进及应用

发布时间：2018-01-15 12:12

本文关键词：重塑黏土空心圆柱试样制备技术改进及应用　出处：《岩土力学》2015年S1期 　论文类型：期刊论文

【摘要】：受大体积制样降低土体均衡性及取芯扰动试样的影响,目前在包括主应力轴旋转等复杂应力路径下所开展的重塑软黏土力学特性试验研究的可靠性有待进一步提高。基于真空预压技术设计了制备重塑样的新型装置及方法,具有渗透排水与内壁成型双重作用的竖向排水体、分级施加真空负压以及多个试样同时制作等部件和技术,可快速制备大量空心圆柱试样,所制试样含水率具有较好的均匀性和一致性,减小了后期取芯对试样造成的扰动。开展了主应力轴旋转路径下的相关验证试验,从土体力学性能方面证明了所制试样用于研究复杂应力路径条件下土体性态演变规律的可靠性,为系统研究软黏土静动力学特性与长期稳定性提供了前提。
[Abstract]:It is affected by mass sample preparation to reduce the equilibrium of soil and the sample to be disturbed by coring. The reliability of the experimental study on the mechanical properties of remolded soft clay under complex stress paths, including the rotation of principal stress axes, needs to be further improved. A new device for preparing remolded samples is designed based on vacuum preloading technology. Method. A large number of hollow cylindrical specimens can be rapidly prepared by the vertical drainage body with the dual function of permeable drainage and the forming of the inner wall, the vacuum negative pressure being applied by stages, and the simultaneous production of several samples at the same time. The moisture content of the sample has good uniformity and consistency, which reduces the disturbance caused by the core extraction in the later stage. The related verification test is carried out under the rotation path of the principal stress axis. From the aspect of mechanical properties of soil mass, the reliability of the specimen is proved to be used to study the evolution law of soil mass under complex stress paths, which provides a prerequisite for the systematic study of the static and dynamic characteristics and long-term stability of soft clay.
【作者单位】：河海大学岩土力学与堤坝工程教育部重点实验室;铁道第三勘察设计院集团有限公司;
【基金】：国家自然科学基金高铁联合项目(No.U1134207);国家自然科学基金面上项目(No.51479060)
【分类号】：TU472.33
【正文快照】： 1引言在岩土工程技术领域中,为了获取土体在地震、波浪与交通荷载等复杂动力条件下的力学响应特性,常常需要开展各种主应力轴旋转路径下空心圆柱试样的室内试验研究[1]。原状土样具有原位应力状态和原始结构,可用于研究土体强度和变形等原生各向异性规律,但原状试样取样和保存

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