超高含水率泥炭土的固化机理及强度特性

Solidification Mechanism and Strength Characteristics of Peat with Ultra-high Water Content

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.

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.