[1]胡屏,陈志波,罗旋,等.含粗颗粒花岗岩残积土大型直剪试验研究[J].自然灾害学报,2019,28(06):119-126.[doi:10.13577/j.jnd.2019.0613]
 HU Ping,CHEN Zhibo,LUO Xuan,et al.Large direct shear test study on coarse-grained granite residual soil[J].,2019,28(06):119-126.[doi:10.13577/j.jnd.2019.0613]
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含粗颗粒花岗岩残积土大型直剪试验研究
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《自然灾害学报》[ISSN:/CN:23-1324/X]

卷:
28
期数:
2019年06期
页码:
119-126
栏目:
出版日期:
2019-12-28

文章信息/Info

Title:
Large direct shear test study on coarse-grained granite residual soil
作者:
胡屏123 陈志波123 罗旋4 李自立123 安亚洲123
1. 福州大学 环境与资源学院, 福建 福州 350116;
2. 国土资源部丘陵山地地质灾害防治重点实验室(福州大学), 福建 福州 350116;
3. 地质工程福建省高校工程研究中心, 福建 福州 350116;
4. 国土资源部丘陵山地地质灾害防治重点实验室(福建省地质工程勘察院), 福建 福州 350002
Author(s):
HU Ping123 CHEN Zhibo123 LUO Xuan4 LI Zili123 AN Yazhou123
1. College of Environment and Resources, Fuzhou University, Fuzhou 350116, China;
2. Key Laboratory of Geohazard Prevention of Hilly Mountains, Ministry of Land and Resources(Fuzhou University), Fuzhou 350116, China;
3. Fujian Provincial Universities Engineering Research Center of Geological Engineering, Fuzhou 350116, China;
4. Key Laboratory of Geohazard Prevention of Hilly Mountain, Ministry of Land and Resources(Geological Engineering Investigation Institute of Fujian Province), Fuzhou 350002, China
关键词:
花岗岩残积土抗剪强度指标大型直剪试验粗颗粒含量颗粒破碎率
Keywords:
granite residual soilshear strength indexlarge direct shear testcoarse-grained contentparticle breakage
分类号:
TU43;X9
DOI:
10.13577/j.jnd.2019.0613
摘要:
花岗岩由于风化不完全,所以其砾石颗粒含量一般较高,颗粒直径从几厘米到数米不等,直径较大的颗粒通常演化成风动石、石碑等自然景观。粗颗粒含量对土体的强度变形特性以及颗粒破碎有一定的影响。本文利用大型直剪仪,对福州地区花岗岩残积土进行不同粗颗粒含量下的大型直剪试验,并且对每次试验前后进行颗分试验,以研究剪切过程颗粒破碎的影响。试验结果表明:混合土体在不同的竖向压力下,均表现出应变硬化特征;当粗颗粒含量较大(P5 ≥ 30%)、竖向压力较高(σ=300 kPa、400 kPa)时,应力应变曲线没有出现峰值;随着粗颗粒含量的增加,花岗岩残积土的粘聚力c呈现先减小后增加的趋势,转折点在P5=30%,而内摩擦角φ则一直呈现上升的趋势;粗粒土颗粒破碎率与粗颗粒含量和竖向压力皆呈正相关关系,但是竖向压力和粗颗粒含量较低时,粗颗粒之间互相接触的作用力没有达到粗颗粒承载极限值,颗粒破碎现象不明显。
Abstract:
Due to the incomplete weathering of granite, the content of gravel particles is generally high. Particle diameters range from a few centimeters to several meters, and larger diameter particles usually evolve into natural landscapes such as wind moving stones and stone monuments. The coarse particle content has a certain influence on the strength and deformation characteristics of the soil and the particle breakage. In this study, a large direct shear test was carried out on the granite residual soil in Fuzhou area under different coarse particle contents, and the particle test was carried out before and after each test to study the effect of particle breakage during the shear process. The test results show that the mixed soil exhibits strain hardening characteristics under different vertical pressures. When the coarse particle content is large (P5 ≥ 30%) and the vertical pressure is high (σ=300kPa, 400kPa), there is no peak in the stress-strain curve. With the increase of coarse particle content, the cohesive force c of granite residual soil first decreases and then increases. The turning point is P5=30%, while the internal friction angle φ always shows an upward trend. The particle breakage rate of coarse-grained soil is positively correlated with the coarse particle content and vertical pressure, but when the vertical pressure and coarse particle content are low, the force of contact between the coarse particles does not reach the coarse particle bearing limit value, and the particle breakage phenomenon is not obvious.

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备注/Memo

备注/Memo:
收稿日期:2019-02-17;改回日期:2019-04-28。
基金项目:福建省自然科学基金(2017J01481);国土资源部丘陵山地地质灾害防治重点实验室开放基金(FJKLGH2017K005)
作者简介:胡屏(1993-),男,硕士研究生,主要从事土体工程性质等方面的研究.E-mail:792588809@qq.com
通讯作者:陈志波(1977-),男,教授,博士,主要从事岩土工程与地质工程方面的研究.E-mail:czb@fzu.edu.cn
更新日期/Last Update: 1900-01-01