›› 2014, Vol. 35 ›› Issue (3): 710-716.

• 基础理论与实验研究 • 上一篇    下一篇

分级连续加载条件下原状膨胀土固结变形研究

陈伟志1, 2,蒋关鲁1, 2,王智猛3,李安洪3   

  1. 1. 西南交通大学 土木工程学院,成都 610031;2. 西南交通大学 高速铁路线路工程教育部重点试验室,成都 610031; 3. 中铁二院工程集团有限责任公司,成都 610031
  • 收稿日期:2013-01-04 出版日期:2014-03-10 发布日期:2014-03-19
  • 通讯作者: 蒋关鲁,男,1962年生,博士,教授,主要从事道路与铁道工程方向研究。E-mail:wgljiang@swjtu.edu.cn E-mail:chenweizhi55@163.com
  • 作者简介:陈伟志,男,1985年生,博士研究生,主要从事高速铁路路基及地基处理设计等方面的研究
  • 基金资助:

    铁道部科技研究开发计划项目(No.2010G003-F)

Study of consolidation deformation of intact expansive soil under stage continuous loading conditions

CHEN Wei-zhi1, 2,JIANG Guan-lu1, 2,WANG Zhi-meng3,LI An-hong3   

  1. 1. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China; 2. Key Laboratory of High-speed Railway Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, China; 3. China Railway Eryuan Engineering Group Co., Ltd., Chengdu 610031, China
  • Received:2013-01-04 Online:2014-03-10 Published:2014-03-19

摘要: 由固结系数Cv与有效应力 和孔隙比的关系,推导了考虑固结系数变化的分级连续加载固结控制方程。根据方程的解析解得到了分级连续加载的沉降计算公式。结合云桂高速铁路建设,以高路堤分段堆载方式为研究依据,在GDS三轴试验系统开展原状膨胀土分级连续加载K0固结试验。结果表明:沉降与时间关系在加载期呈折线式发展,稳载期呈双曲线变化;膨胀土的应力-应变关系呈阶梯式变化;当 ≤ 时,固结系数随有效应力呈先增大而后减小,当 > 时,固结系数随有效应力呈波动持续减小。固结度理论计算值与试验结果相比,考虑固结系数变化的固结度计算比固结系数为定值更准确。分级连续加载沉降计算公式可作为分析高速铁路路基沉降-时间关系的参考方法。

关键词: 分级连续加载, 固结系数, 原状膨胀土, 固结度

Abstract: Based on the relationship among the coefficient of consolidation Cv, effective stress and void ratio, the equations considering the variation of Cv for consolidation under stage continuous loading are derived. According to analytical solutions of the above equations, a formula for settlement calculation under stage continuous loading is obtained. Combined with the construction of Yun-Gui high-speed railway, taking the stage loading of high embankment as the object of study, stage continuous loading oedometer test of intact expansive soil are carried out on geotechnical digital systems (GDS) triaxial apparatus. It is confirmed that the relationship between settlement and time can be fitted with broken line in loading stage and hyperbola in steady stage. The stress-strain curves of expansive soil can be described with ladder. The coefficient of consolidation increases firstly and then decreases with effective stress when ≤ ; however, it decreases continuously as wave while > The calculated values of degree of consolidation are compared with test results. It is found that the degree of consolidation calculated by considering the variation of Cv is more accurate than constant Cv. The formula for settlement calculation under stage continuous loading can be used as a reference method to analyze the relationship between settlement and time of subgrade for high-speed railway.

Key words: stage continuous loading, coefficient of consolidation, intact expansive soil, degree of consolidation

中图分类号: 

  • TU443
[1] 李新明, 孔令伟, 郭爱国, . 南阳原状膨胀土不排水剪切性状时效性试验研究[J]. 岩土力学, 2019, 40(8): 2947-2955.
[2] 李新明, 孔令伟, 郭爱国, . 原状膨胀土剪切力学特性的卸荷速率 效应试验研究[J]. 岩土力学, 2019, 40(10): 3758-3766.
[3] 商翔宇,郝 飞,顾建祥,况联飞,周国庆,郑秀忠,. 重塑黏土的高压次固结特性初探[J]. , 2018, 39(7): 2387-2394.
[4] 刘忠玉,杨 强. 基于分数阶Kelvin模型的饱和黏土一维流变固结分析[J]. , 2017, 38(12): 3680-3687.
[5] 李镜培 ,方 睿 ,李 林 ,唐剑华 , . 基于变固结系数的静压桩周土体力学特性研究[J]. , 2016, 37(3): 679-696.
[6] 雷华阳 ,李 宾 ,仇王维 ,卢海滨 ,任 倩,. 吹填场区软黏土地基的次固结特性研究[J]. , 2015, 36(S1): 120-124.
[7] 汪洪星 ,杨春和 ,陈 锋 ,冒海军,. 软土抗剪强度指标随固结度变化规律分析[J]. , 2014, 35(S1): 106-112.
[8] 许 波 ,雷国辉 ,郑 强 ,刘加才,. 考虑涂抹区压缩及渗透系数变化的堆载预压固结解[J]. , 2014, 35(6): 1607-1616.
[9] 张玉国 ,孙 敏 ,谢康和,. 未打穿散体材料桩复合地基固结简化解研究[J]. , 2014, 35(5): 1303-1310.
[10] 魏新江 ,张 涛 ,丁 智 ,王常晶 ,蒋吉清,. 地铁荷载下不同固结度软黏土的孔压试验模型[J]. , 2014, 35(10): 2761-2768.
[11] 张福海 ,陈 雷 ,郭帅杰 ,任朋勋 , . 底部抽真空预压法砂井地基固结解析解[J]. , 2014, 35(10): 2787-2793.
[12] 吴雪婷. 温州浅滩淤泥固结系数与固结应力关系研究[J]. , 2013, 34(6): 1675-1680.
[13] 冯 源,罗小勇,林伟岸,詹良通,柯 瀚,陈云敏. 处置库污泥工程特性测试研究[J]. , 2013, 34(1): 115-122.
[14] 秦植海,秦 鹏. 海堤地基固结系数反演与工后沉降分形模型预测[J]. , 2012, 33(6): 1747-1753.
[15] 张先伟 ,王常明. 软土结构性对次固结系数的影响[J]. , 2012, 33(2): 476-482.
Viewed
Full text


Abstract

Cited

  Shared   
  Discussed   
[1] 张文杰,陈云敏. 垃圾填埋场抽水试验及降水方案设计[J]. , 2010, 31(1): 211 -215 .
[2] 宫伟力,安里千,赵海燕,毛灵涛. 基于图像描述的煤岩裂隙CT图像多尺度特征[J]. , 2010, 31(2): 371 -376 .
[3] 万 智,董 辉,刘宝琛. 基于正交设计下SVM滑坡变形时序回归预测的超参数选择[J]. , 2010, 31(2): 503 -508 .
[4] 孙曦源,栾茂田,唐小微. 饱和软黏土地基中桶形基础水平承载力研究[J]. , 2010, 31(2): 667 -672 .
[5] 王明年,郭 军,罗禄森,喻 渝,杨建民,谭忠盛. 高速铁路大断面黄土隧道深浅埋分界深度研究[J]. , 2010, 31(4): 1157 -1162 .
[6] 胡勇刚,罗 强,张 良,黄 晶,陈亚美. 基于离心模型试验的水泥土搅拌法加固斜坡软弱土地基变形特性分析[J]. , 2010, 31(7): 2207 -2213 .
[7] 谭峰屹,姜志全,李仲秋,颜惠和. 附加质量法在昆明新机场填料压实密度检测中的应用研究[J]. , 2010, 31(7): 2214 -2218 .
[8] 柴 波,殷坤龙,肖拥军. 巴东新城区库岸斜坡软弱带特征[J]. , 2010, 31(8): 2501 -2506 .
[9] 王光进,杨春和,张 超,马洪岭,孔祥云,侯克鹏. 超高排土场的粒径分级及其边坡稳定性分析研究[J]. , 2011, 32(3): 905 -913 .
[10] 胡海军,蒋明镜,赵 涛,彭建兵,李 红. 制样方法对重塑黄土单轴抗拉强度影响的初探[J]. , 2009, 30(S2): 196 -199 .