不同有机质含量泥炭土的固结特性研究  

Study on Consolidation Characteristics of Peat Soils with Different Organic Matter Contents

作　　者：程宁 张莹晨 王艳萍 李康 沈宇鹏[2] CHENG Ning;ZHANG Yingchen;WANG Yanping;LI Kang;SHEN Yupeng(CCCC China Harbour Engineering Co.,Ltd.,Beijing 100027,China;School of Civil Engineering and Architecture,Beijing Jiaotong University,Beijing 100044,China;CCCC Highway Consultants Co.,Ltd.,Beijing 100010,China)

机构地区：[1]中国港湾工程有限责任公司,北京100027 [2]北京交通大学土木建筑工程学院,北京100044 [3]中交公路规划设计院有限公司,北京100010

出　　处：《路基工程》2025年第1期14-21,共8页Subgrade Engineering

基　　金：中央高校基本科研业务费专项资金(KCJBZY23003536);中交集团2021年重点研发项目(2021-ZJKJ-18)。

摘　　要：选取马来西亚东海岸的三类泥炭质土和一类泥炭土作为研究对象,开展一维固结试验,对比分析采取英国标准(英标)和中国标准(中标)试验处理结果的差异性。结果表明:中标的主次固结系数计算值更高,在工程上将偏于安全;在分级加载下,有机质含量越高,泥炭土的次固结系数越高,呈现出更明显的次固结变形特征,而主固结系数随荷载增加而下降趋势越平缓,即主固结过程受荷载变化影响程度降低;泥炭土试样的e-lgt曲线呈现反“S”形,当荷载处于0~100.0 kPa时,次固结系数Ca随荷载增加而不断上升,即Ca的峰值处于荷载100.0~200.0 kPa。有机质含量的增加会导致泥炭土的固结特性发生显著变化。Three-class peat soil and one-class peat soil from the east coast of Malaysia were selected as research objects to carry out the one-dimensional consolidation test and the differences between the test results adopted by the British standard and the Chinese standard were compared and analyzed.The results show that the calculated value of the primary and secondary consolidation coefficients for Chinese standard is higher,which will be tend to safe in the project.Under graded loading,the higher the content of organic matter,the higher the secondary consolidation coefficient of peat soil,showing more obvious secondary consolidation deformation characteristics,while the primary consolidation coefficient decreases more gently with the increase of load,that is,the degree of influence of the change of load on the primary consolidation process decreases.The e-lgt curve of peat soil samples presents an inverse"S"shape.When the load is 0−100.0 kPa,the secondary consolidation coefficient keeps rising with the increase of the load,that is,the peak value is in the range of 100.0−200.0 kPa.The increase of organic matter content will lead to significant changes in the consolidation characteristics of peat soil.

关 键 词：泥炭土 有机质含量 主固结 次固结 固结试验 

分 类 号：TU441.8[建筑科学—岩土工程]