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| 基于C-C型固化剂的吹填超软土渗透固结特性研究 |
| Study on permeability and consolidation characteristics of hydraulic fill ultra-soft soil based on C-C type curing agent |
| 投稿时间：2018-05-21 修订日期：2018-06-26 |
| DOI： |
| 中文关键词: 半固化 固化 吹填超软土 固结 增渗机制 |
| 英文关键词: semi solidification solidification hydraulic fill ultra-soft soil consolidation permeability increasing mechanism |
| 基金项目:国家自然科学基金(41772303)；上海市自然科学基金(17ZR1410100). |
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| 中文摘要: |
| 在吹填超软土中加入不同数量级掺量的C-C 固化剂进行压缩固结和真空固结试验,对固结前后的土体的渗透固结特性和基于有效孔隙比与孔隙抗压性能的增渗机制进行研究,探究既能提高渗透性,又能保持较高强度的合理掺量,得到如下结论：(1) 半固化超软土的固结特性与软黏土基本一致,固结系数随固结压力的增大而增大,渗透系数随荷载的增大而减小；相同荷载作用下,固结系数和渗透系数均随掺量的增加而增大。(2) 加入少量固化剂后,压汞试验显示孔径分布曲线峰值明显左移,孔径集中分布区间向小孔隙区间移动,土样有效孔隙比随掺量的增加先增加后减小,土体骨架的存在使得孔隙抗压缩性能不断增加,保留了具有较高强度结构的排水通道,这种压缩性较低的多孔骨架结构对渗透性的提高有着显著的改观。(3) 固化过程中,固化剂掺量越多,形成土骨架的作用越明显,土体强度和抗压缩能力就越高,其中掺量为10%的土样无侧限抗压强度高达360.1kPa,远高于直接固化强度且无需二次加固,同时超软土的压缩性就越低。研究表明,固化剂掺量在1%～10%范围内时,主要发挥的是增渗作用,是药剂真空预压处理超软土的理想添加范围,而超过这一掺量后以固化作用为主。 |
| 英文摘要: |
| To determine the optimal dosage of C-C type curing agents in the hydraulic ultra-soft soil fill for both permeability and strength improvement, compression consolidation test and vacuum consolidation test were carried out. After the test, the mechanism of permeability and consolidation characteristics improvement are evaluated by the effective pore ratio and the pore anti-compressive performance. Test results are as follow: (1) The consolidation coefficient of the soil, similar with soft clay, is increased with increasing pressure while the permeability coefficient is decreased. And the coefficients are increased with the increasing addtion under the same load. (2) After adding a small amount of curing agents, Mercury injection test shows that the peak value of pore size distribution curve shifts to left evidently, interval of concentrated aperture is moved to small pore interval, and the effective void ratio exists maximum with different addition. The porous structure with low compressibility, increasing compressive properties of pores, retaining high strength drainage path and improving permeability, was formed. (3) The more agent is added, the more obvious phenomenon of soil skeleton is and the higher soil strength and anti-compression ability are. Particularly, the unconfined compressive strength of the sample with 10% addition is up to 360.1 kPa. It is far higher than that of the sample prepared by curing only. The study reveals that the addition in 1%~10%, appropriate for vacuum preloading treatment, can improve the permeability primarily while >10%. |
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