西宁地区不同深度原状黄土湿陷性及微观机理研究

崔靖俞; 张吾渝; 解邦龙; 纪曦; 季港澳

doi:10.11779/CJGE2019S2062

西宁地区不同深度原状黄土湿陷性及微观机理研究 English Version

青海大学土木工程学院,青海西宁810016

基金项目: 青海省科技厅项目（2017-ZJ-792,2018-ZJ-T01）; 国家自然基金项目（51768060）; 青海大学创新基金项目（TC2019-02）

详细信息

作者简介:
崔靖俞(1993— ),男,山西太原人,硕士研究生,主要从事地基处理的研究。E-mail：tycjy123@163.com。

通讯作者:
张吾渝，E-mail：qdzwy@163.com

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出版历程
- 收稿日期: 2019-04-29
- 发布日期: 2019-07-19

Collapsibility and microscopic mechanism of intact loess at different depths in Xining area

School of Civil Engineering, Qinghai University, Xining 810016, China

摘要

摘要: 通过室内浸水压缩试验对不同深度西宁地区原状黄土的湿陷性进行了研究,并结合扫描电子显微镜（SEM）和颗粒及裂隙图像识别分析系统（PCAS）,分析了不同埋深、不同上覆压力下的原状黄土湿陷性与内部微观结构的关系。结果表明：土体内部的大孔隙,架空结构及大量的直接点接触是本地区黄土具有湿陷性的内部条件;随着埋深的增大,在相同上覆压力及浸水条件下,湿陷性有逐渐减小的趋势,而在相同埋深情况下,在一定范围内,随着上覆压力的增加并给予浸水条件,黄土的湿陷性有着明显的提高,证明了外部荷载和浸水是黄土发生湿陷性的外部条件。
- 原状黄土 /
- 湿陷系数 /
- 微观结构
Abstract: The collapsibility of the intact loess at different depths in Xining area is studied through the laboratory immersion compression tests. Combined with the scanning electron microscopy (SEM) and the particle and crack image recognition and analysis system (PCAS), the relationship between the collapsibility of intact loess and the internal microstructure under different overburden pressures is analyzed. The results show that the large pores, overhead structure and a large number of direct contact points are the internal conditions of loess with collapsibility in this region. With the increase of the buried depth, the collapsibility tends to decrease gradually under the same overlying pressure and immersion condition. However, at the same buried depth, within a certain range, with the increase of the overlying pressure and the given immersion condition, the collapsibility of loess is obviously improved, which proves that the external load and immersion are the external conditions of collapsibility of loess.
- intact loess /
- coefficient of collapsibility /
- microstructure

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参考文献(10)

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