分解度对草炭土结构特征及强度的影响试验

J4 ›› 2010, Vol. 40 ›› Issue (6): 1395-1400.

分解度对草炭土结构特征及强度的影响试验

刘飞|佴磊|吕岩|张敏

吉林大学建设工程学院| 长春130026

收稿日期:2010-04-22 出版日期:2010-11-26 发布日期:2010-11-26
作者简介:刘飞(1984-)|女|贵州贵阳人|博士研究生|主要从事岩体和土体工程地质问题研究|E-mail:julia431@126.com
基金资助:
国家自然科学基金项目(40772169)；吉林大学2010年研究生创新研究计划资助项目(20101061)

Experiment of Influence of Decomposition Degree on Structure Characteristics and Strength of Turfy Soil

LIU Fei, NAI Lei, LV Yan, ZHANG Min

College of Construction Engineering, Jilin University, Changchun130026, China

Received:2010-04-22 Online:2010-11-26 Published:2010-11-26

摘要/Abstract

摘要：

大量资料表明，草炭土是一种分解度不一的腐殖质土。针对这一特性进行了一系列的室内试验，研究草炭土的微观结构及强度随分解度的变化特征。采用灵敏度试验和常规三轴试验测定原状土与重塑土的无侧限抗压强度以及应力-应变变化规律，研究不同分解度草炭土的灵敏度及结构强度变化特征，从力学及微结构等方面对分解度在草炭土结构特征和强度变化中所起的作用进行了深入分析，并利用高压固结试验，对不同分解度草炭土的结构强度进行了测定。分析结果表明:草炭土属于中高分解度土，并且随着分解度的提高，试样的结构逐渐从架空结构发展为絮凝状结构，孔隙逐渐变小，结构灵敏度也由2.029逐渐减小为1.075。通过高压固结试验测得1^#、2^#、3^#草炭土试样的结构强度分别为17 kPa、15 kPa和9 kPa。

关键词: 草炭土, 分解性, 微观结构, 结构性分析

Abstract:

Turfy soil is a humus soil which is formed at lowland with the characteristics of high organic matter content, large void ratio, high compressibility and different decomposition degree. The variation characteristics of structural strength with different decomposition degrees of turfy soil are researched through indoor tests. It is studied on the characteristic of microstructure with the change of decomposition degree of turfy soil. Then, the unconfined compressive strength and the variation of stress-strain with different decomposition degrees are determined by sensitivity tests and triaxial tests for undisturbed and disturbed soils. The variation features of sensitivity and structural strength with different decomposition degrees are tested by compression experiments and analysed from its structure and mechanism. The results show that turfy soil is a soil with high decomposition degree. With the increase of decomposition degree, the structure of the specimens changes from framework structure to flocculated structure, the pore volume becomes small and the structural sensitivity decreases from 2.029 to 1.075. The structural strength of specimens 1^#,2^#,3^# are 17 kPa, 15 kPa and 9 kPa respectively.

Key words: turfy soil, decomposition, microstructure, structural analysis

中图分类号:

TU411

刘飞, 佴磊, 吕岩, 张敏. 分解度对草炭土结构特征及强度的影响试验[J]. J4, 2010, 40(6): 1395-1400.

LIU Fei, NAI Lei, LV Yan, ZHANG Min. Experiment of Influence of Decomposition Degree on Structure Characteristics and Strength of Turfy Soil[J]. J4, 2010, 40(6): 1395-1400.

参考文献

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