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17kPa、15kPa和9kPa。
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.
出处
《吉林大学学报（地球科学版）》
EI
CAS
CSCD
北大核心
2010年第6期1395-1400,共6页
Journal of Jilin University：Earth Science Edition
基金
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)
关键词
草炭土
分解性
微观结构
结构性分析
turfy soil； decomposition； microstructure； structural analysis
