滇池泥炭土物理力学指标统计特性研究  

Study on Statistical Properties of Physico-mechanical Index of Peat Soil in Dianchi

作　　者：徐其富 桂跃[2] 余志华[2] 

机构地区：[1]中国有色金属工业昆明勘察设计研究院,云南昆明650001 [2]昆明理工大学建筑工程学院,云南昆明650500

出　　处：《有色金属设计》2016年第4期48-57,共10页Nonferrous Metals Design

基　　金：岩土力学与堤坝工程教育部重点实验室开放基金项目(GH201401)

摘　　要：通过搜集数个典型场地的地质勘查数据,系统分析了滇池泥炭土时空分布特征及物理力学指标间的统计特性关系,重点分析了有机质含量及其组分特征对于泥炭土工程特性的影响。结果表明：（1）滇池泥炭土埋深在3.6~10 m之间,厚度变化范围为2.3~7.3 m。该区域泥炭土多属于高分解度泥炭土,其有机质含量、孔隙比的分布范围为10.5%~84.1%、1.5~9.2,具有压缩性高,强度较低的特点;（2）通过对各物理力学指标进行回归分析发现,泥炭土含水率与孔隙比、压缩系数、抗剪强度呈线性正相关关系,而随着有机质含量的增加,孔隙比增大,天然重度减小,压缩性、抗剪强度增大;（3）相对于纤维泥炭土,滇池泥炭土由于分解度高,纤维含量较少,腐殖质颗粒较多,结构更加致密而具有更小的孔隙比、含水率以及较大的天然重度、颗粒比重。After collecting the geological survey data of typical sites,the statistical characteristics relation between the spatial and temporal distribution characteristics and the physico-mechanical indexes was analyzed and the emphasis was put on the effect of organic contents and component features on the engineering characteristics of peat soil. Results show that：（ 1） The peat soil in Dianchi is 3. 6 ~ 10 m in depth and 2. 3 ~ 7. 3 m in thickness. The peat soil in this area is highly resolved and its organic content and void ratio are in the range of 10. 5 % ~ 84. 1 % and 1. 5 ~ 9.2,respectively. It is characterized by high compressibility and low strength.（ 2） According to the regression analysis on physico-mechanical indexes,linear positive correlation between the moisture content and void ratio,coefficient of compressibility and shear strength is observed. With the increase of organic contents,void ratio increases,natural density decreases and compressibility and shear strength increase.（ 3） Compared with fibrous peat soil,the peat soil in Dianchi is more compact in structure and has smaller void ratio,moisture content and bigger natural density and specific gravity due to its high decomposition,smaller fiber content and bigger humus content.

关 键 词：土壤性能分析 泥炭土 有机质 组分特征 滇池 

分 类 号：TU447[建筑科学—岩土工程]