###
工程科学与技术:2019,51(4):69-74
←前一篇   |   后一篇→
本文二维码信息
码上扫一扫!
初始相对密实度对粗颗粒土K0影响试验研究
(1.河海大学 岩土力学与堤坝工程教育部重点实验室, 江苏 南京 210098;2.河海大学 岩土工程科学研究所, 江苏 南京 210098;3.广西大学 土木建筑工程学院, 广西 南宁 530004;4.中国水电顾问集团 成都勘测设计研究院, 四川 成都 610072)
Experimental Study on Influence of Initial Relative Density on K0 of Coarse Grained Soil
(1.Key Lab. of Ministry of Education for Geomechanics and Embankment Eng., Hohai Univ., Nanjing 210098, China;2.Geotechnical Research Inst., Hohai Univ., Nanjing 210098, China;3.College of Civil Eng. and Architecture, Guangxi Univ., Nanning 530004, China;4.Chengdu Eng. Corp. Ltd., Power China,Chengdu 610072, China)
摘要
图/表
参考文献
相似文献
本文已被:浏览 1407次   下载 643
投稿时间:2018-06-13    修订日期:2018-07-12
中文摘要: 静止侧压力系数是土体重要的力学参数,深入研究粗颗粒土静止侧压力系数有重要的理论意义和应用价值。关于初始相对密实度对粗颗粒土静止侧压力系数影响的研究几乎空白。为研究粗颗粒土在不同初始相对密实度条件下静止侧压力系数的变化规律,针对某堆石料及砂卵砾石料,利用新近研制的大型静止侧压力系数试验仪,对这两种粗颗粒土不同初始相对密实度试样进行大型静止侧压力系数试验。试验结果表明:土体静止侧压力系数随着竖向应力的增加呈减小趋势,而且这种趋势随着竖向应力的增大趋于平缓;粗颗粒土的静止侧压力系数与初始相对密实度存在线性负相关关系;土料类型对土体静止侧压力系数有一定影响,在正常固结状态下,砂卵砾石料静止侧压力系数可比堆石料大4.0%~7.5%。超固结状态下,砂卵砾石料静止侧压力系数可比堆石料大0~12.4%。通过分析堆石料静止侧压力系数试验结果,验证了笔者之前提出的静止侧压力系数与竖向应力关系式也适用于初始相对密实度不为0的粗颗粒土,并在该关系式的基础上,总结出一个能同时反映粗颗粒土静止侧压力系数与初始相对密实度以及竖向应力之间关系的经验公式。最后,利用砂卵砾石料静止侧压力系数试验结果验证了该经验公式的准确性及适用性。
Abstract:The at-rest earth pressure coefficient is an important mechanical parameter of soil, so the study of the at-rest earth pressure coefficient of coarse grained soil has important theoretical value and practical significance. The relevant research about the influence of initial relative density on at-rest earth pressure coefficient of coarse grained soil is almost blank. To study the at-rest earth pressure coefficient behavior of coarse grained soil with different initial relative density, by changing initial relative density of a sandy gravel and a rockfill with the same gradation, a number of tests to obtain the at-rest earth pressure coefficient behavior of these test specimens were performed using a new-developed large-size apparatus. The test data showed that the at-rest earth pressure coefficient decreases with increasing effective vertical stress, and the tendency of decreasing at-rest earth pressure coefficient trends to weaken with increasing effective vertical stress. There exists a linear negative correlation between the values of at-rest earth pressure coefficient and initial relative density for coarse grained soil. The at-rest earth pressure coefficient is influenced by soil type. During the loading the at-rest earth pressure coefficient of sandy gravel is 4.0%~7.5% greater than that of rockfill, and during the unloading the at-rest earth pressure coefficient of sandy gravel is 0~12.4% greater than that of rockfill. The analysis of the test data of rockfill showed that the relation between at-rest earth pressure coefficient and effective vertical stress, developed by the authors, is appropriate for coarse grained soil with initial relative density that is not zero. Based on the relation, an empirical formula, which can describe well the relationship of effective vertical stress and initial relative density to at-rest earth pressure coefficient for coarse grained soil, was obtained. Furthermore,this empirical formula was verified by test data of sandy gravel.
文章编号:201800678     中图分类号:TU443    文献标志码:
基金项目:国家重点研发计划项目(2017YFC0404804);国家自然科学基金项目(51479052);江苏省研究生科研与实践创新计划项目(20141B1605313);水利部土石坝破坏机理与防控技术重点实验室开放研究基金项目(YK915001)
作者简介:蒋明杰(1990-),男,博士生,助理教授.研究方向:土体基本性质;土石坝工程.E-mail:18751957312@163.com
引用文本:
蒋明杰,朱俊高,何顺宾.初始相对密实度对粗颗粒土K0影响试验研究[J].工程科学与技术,2019,51(4):69-74.
JIANG Mingjie,ZHU Jungao,HE Shunbin.Experimental Study on Influence of Initial Relative Density on K0 of Coarse Grained Soil[J].Advanced Engineering Sciences,2019,51(4):69-74.