| 摘要: |
| 通过开展无侧限抗压强度（UCS）和扫描电子显微镜试验，研究了水泥掺量、有机质含量和pH值对超高含水率泥炭土固化强度的影响.结果表明：随着水泥掺量的增加，固化泥炭土的破坏模式从塑性破坏转为脆性破坏；水泥掺量从10%增加到30%后，固化泥炭土的28 d UCS值增加了161%~485%；泥炭土含水率增加1倍后，固化泥炭土的28 d UCS值降低了42%~79%；相比于pH值为5.5的固化泥炭土，pH值为3.5和7.0固化泥炭土的UCS值降幅、增幅分别为10%~46%和8%~38%；基于固化泥炭土的UCS值，提出了超高含水率泥炭土的水泥固化配比，可以为类似工程提供一定的理论指导. |
| 关键词: 泥炭土 含水率 有机质 pH值 水泥掺量 强度 |
| DOI：10.3969/j.issn.1007-9629.2022.10.008 |
| 分类号:TU449 |
| 基金项目:国家自然科学基金资助项目（52178327）；江苏省水利科学研究院自主科研经费专项资金项目（2020Z027） |
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| Solidification Mechanism and Strength Characteristics of Peat with Ultra-high Water Content |
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WANG Rong1, DONG Junquan2, FAN Yanqi3, SHI Jiangwei2, CHEN Yonghui2
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1.China Harbour Engineering Company Limited， Beijing 100027， China;2.Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering， Hohai University， Nanjing 210024， China;3.Material and Structural Engineering Department， Jiangsu Water Research Institute， Yangzhou 225000， China
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| Abstract: |
| By conducting unconfined compressive strength（UCS） and scanning electronic microscope tests， effects of cement content， organic content and pH value on strength of solidified peats with ultra-high water content were investigated. The results show that the solidified peat damages from plastic mode to brittle mode when the cement content increases. As cement content increases from 10% to 30%， the UCS value of solidified peat at a curing age of 28 d increases by 161%-485%. By increasing water content by 100%， the UCS value of solidified peat at a curing age of 28 d decreases by 42%-79%. Compared with that of solidified peat at pH value of 5.5， the UCS value of peat at pH value of 3.5 decreases by 10%-46%， while the strength of peat at pH value of 7.0 increases by 8%-38%. Cement content of solidified peat with ultra-high water content is proposed based on the UCS value of solidified peat， which can provide guidance for similar projects. |
| Key words: peat water content organic matter pH value cement content strength |
