›› 2016, Vol. 37 ›› Issue (11): 3197-3207.doi: 10.16285/j.rsm.2016.11.020

• 基础理论与实验研究 • 上一篇    下一篇

高原湖相泥炭土渗透特性研究及机制分析

桂 跃1, 2, 3,付 坚1,吴承坤1,曹 净1,高玉峰2, 3   

  1. (1.昆明理工大学 建筑工程学院,云南 昆明 650051;2.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; 3.河海大学 江苏省岩土工程技术工程研究中心,江苏 南京 210098
  • 收稿日期:2016-04-05 出版日期:2016-11-11 发布日期:2018-06-09
  • 作者简介:桂跃,1982年生,博士,副教授,硕士生导师,主要从事软土力学及地下工程等方面教学与科研工作。
  • 基金资助:

    国家自然科学基金资助项目(No. 51568030,No. 41402277);岩土力学与堤坝工程教育部重点实验室开放基金项目(No. GH201401);昆明理工大学人培项目(No. KKSY201306106)

Hydraulic conductivity of lacustrine peaty soil in plateau areas and its mechanism analysis

GUI Yue1, 2, 3, FU Jian1, WU Cheng-kun1, CAO Jing1, GAO Yu-feng2, 3   

  1. 1. Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming, Yunnan 650051, China; 2. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing, Jiangsu 210098, China; 3. Jiangsu Research Center for Geotechnical Engineering Technology, Hohai University, Nanjing, Jiangsu 210098, China
  • Received:2016-04-05 Online:2016-11-11 Published:2018-06-09
  • Supported by:

    This work was supported by the National Science Foundation of China (51568030, 41402277), the Science Foundation of the Key Laboratory of Geomechanics and Embankment Engineering(Hohai University), Ministry of Education(GH201401) and the Personnel Training Foundation supported by Kunming University of Science and Technology (KKSY201306106).

摘要: 为明确高原湖相泥炭土渗透特性并建立渗透模型,采用固结-渗透联合试验装置对取自6个场地20余组土样天然状态及一维压缩过程中渗透系数进行测定,并分析了加载时长、应力水平以及烧失量、残余纤维含量等因素对其渗透性的影响。试验结果表明:分别加载条件下,泥炭土渗透系数 随加载时长T增大而减小并趋于稳定,稳定时长在10 d左右;分级加载条件下, 随固结应力 的增大呈非线性减小, - 关系曲线为反S型;高原湖相泥炭土渗透模型可用e- 表示,其渗透指数 与初始孔隙比 满足关系式 0.25 ;初始渗透系数 和烧失量 、残余纤维含量 及 关系较为离散, 和 、 及初始含水率 有一定的正相关性。通过电镜扫描试验,从土中孔隙特征角度探讨了高原湖相泥炭土渗透特性的机制。

关键词: 泥炭土, 渗透性, 烧失量, 渗透指数, 孔隙比。

Abstract: To explore the hydraulic conductivity of lacustrine peaty soil in plateau areas, the permeability coefficients of 20 groups of soil samples from 6 sites were measured under one-dimensional compression conditions through oedometer tests. The effects of loading time, stress level, loss-on-ignition and residual fiber contents on the permeability coefficients are analyzed. The experimental results show that under the conditions of separately loading, permeability coefficient decreases with the elapsing time and tends to be stabilized in about ten days; under the conditions of stepwise loading, the permeability coefficient decreases nonlinearly with increasing consolidation pressure, and the curves of - resemble a reverse “S”. A permeability model for lacustrine peaty soil in plateau areas can be represented by expression e- , and the relations between the permeability index ( ) and initial void ratio can be described by 0.25 . The relationships among initial permeability coefficient and loss-on-ignition , residual fiber content and are more discrete, and there clearly exits a positive correlation among , , and the initial water content . Through scanning electron microscope, the mechanism of the peaty soil permeability is discussed from the pore characteristics of soil.

Key words: peaty soil, permeability properties, loss-on-ignition, permeability index, void ratio

中图分类号: 

  • TU 47

[1] 桂跃, 吴承坤, 赵振兴, 刘声钧, 刘锐, 张秋敏. 微生物分解有机质作用对泥炭土工程性质的影响[J]. 岩土力学, 2020, 41(S1): 147-155.
[2] 李华, 李同录, 江睿君, 范江文. 基于滤纸法的非饱和渗透性曲线测试[J]. 岩土力学, 2020, 41(3): 895-904.
[3] 李玲, 刘金泉, 刘造保, 刘桃根, 王伟, 邵建富, . 砂-黏土混合物高压压实性能试验研究[J]. 岩土力学, 2019, 40(9): 3502-3514.
[4] 沈泰宇, 汪时机, 薛乐, 李贤, 何丙辉, . 微生物沉积碳酸钙固化砂质黏性紫色土试验研究[J]. 岩土力学, 2019, 40(8): 3115-3124.
[5] 李 崴, 王者超, 毕丽平, 刘 杰, . 辐射流条件下裂隙岩体渗透性表征单元体尺寸 与等效渗透系数[J]. 岩土力学, 2019, 40(2): 720-727.
[6] 董金玉,王 闯,周建军,杨继红,李严威,. 泡沫改良砂卵石土的试验研究[J]. , 2018, 39(S1): 140-148.
[7] 左宇军,孙文吉斌,邬忠虎,许云飞,. 渗透压–应力耦合作用下页岩渗透性试验[J]. , 2018, 39(9): 3253-3260.
[8] 王海波,吴 琪,杨 平,. 细粒含量对饱和砂类土液化强度的影响[J]. , 2018, 39(8): 2771-2779.
[9] 杨建民,霍王文,. 渗透性水平向各向异性导致椭圆形地面沉降漏斗的一个性质[J]. , 2018, 39(8): 2960-2976.
[10] 任玉宾,王 胤,杨 庆. 颗粒级配与形状对钙质砂渗透性的影响[J]. , 2018, 39(2): 491-497.
[11] 张 强,李小春,胡少斌,牛智勇,汪 芳,范 坤,邵光强,. 高应力下花岗岩耦合节理在剪切过程中渗透率演化特性[J]. , 2018, 39(10): 3641-3650.
[12] 张豫川,姚永国,周 泓,. 长龄期改良黄土抗剪强度与渗透性试验研究[J]. , 2017, 38(S2): 170-176.
[13] 曾超峰,薛秀丽,郑 刚,. 软土地基渗透性条件对基坑预降水过程中支护墙侧移的影响研究[J]. , 2017, 38(10): 3039-3047.
[14] 张虎元,彭 宇,王学文,林澄斌,. 抗疏力固化剂改性黄土进失水能力研究[J]. , 2016, 37(S1): 19-26.
[15] 王铁行,杨 涛,鲁 洁. 干密度及冻融循环对黄土渗透性的各向异性影响[J]. , 2016, 37(S1): 72-78.
Viewed
Full text


Abstract

Cited

  Shared   
  Discussed   
No Suggested Reading articles found!