Experimental study on a dredged fill ground improved by a two-stage vacuum preloading method
Experimental study on a dredged fill ground improved by a two-stage vacuum preloading method
复制标题
两级真空预压法改良疏浚填方试验研究
DOI：
10.1016/j.sandf.2018.02.028
复制
发表时间：
2018-06
影响因子：
3.7
通讯作者：
Wei Zheng
中科院分区：
文献类型：
--
作者：
Jun Wang;Yuanqiang Cai;Hongtao Fu;Xiuqing Hu;Ying Cai;Haizhi Lin;Wei Zheng
在众多地基处理方法中，考虑到工程的工期和吹填土的特性，真空预压法被明智地选择。然而，真空度随土层深度的增加而降低、排水板周围的堵塞以及深层土体固结的恶化等因素对真空预压法处理疏浚海积土地基提出了很大的挑战。因此，本研究提出两阶段真空预压法，并着重探讨其可行性与有效性。对比实验室试验是在两个相同的实验罐与疏浚海洋粘土填料从中国温州填海造地在中国。在一个水池中，一个阶段的真空预压法被用来作为本研究的基线。在另一个水池中，建议使用两级真空预压法进行加固;它包括两个阶段。在第一阶段，疏浚海粘土填料的条件下，真空预压使用一半的PVDs，其中的超孔隙水压力的消散趋于稳定。在第二阶段中，使用所有的PVD激活真空预压。结果表明，从固结后的沉降、真空压力、孔隙水压力、含水量、十字板抗剪强度和土颗粒微观结构等方面来看，该方法具有较好的固结效果。
The vacuum preloading method has been wisely chosen among many ground-improvement methods considering the time limit of many projects and the characteristics of reclaimed soil. However, the loss in vacuum with soil depth, the clogging around prefabricated vertical drains (PVDs), and the deteriorative consolidation of the deep soil layer, among other factors, create a large challenge to vacuum preloading for dredged marine clay fill. Thus, this study proposes a two-stage vacuum preloading method and focuses on its feasibility and effectiveness. Contrasting laboratory tests are performed in two identical experimental tanks with dredged marine clay fill from the Wenzhou land reclamation site in China. In one tank, the one-stage vacuum preloading method is used to serve as a baseline for this study. In the other tank, use of the two-stage vacuum preloading method is proposed for consolidation; it comprises two stages. In the first stage, the dredged marine clay fill is conditioned by vacuum preloading using half of the PVDs, where the dissipation of the excess pore water pressure tends to be steady. In the second stage, vacuum preloading is activated using all the PVDs. The results show that a better consolidation effect is achieved with the proposed method in terms of the settlement, vacuum pressure, pore water pressure, water content, vane shear strength, and soil particle microstructure after soil consolidation.
登录
查看更多内容
具有三个物理参数的疏浚粘土压缩行为的实际估计
影响因子：
7.4
作者：
Zeng L L;Hong Z S;Gao Y F
通讯作者：
Gao Y F
DOI：
10.5860/choice.34-0331
发表时间：
1948
期刊：
--
影响因子：
--
作者：
K. Terzaghi;R. Peck;G. Mesri
通讯作者：
K. Terzaghi;R. Peck;G. Mesri
DOI：
--
发表时间：
2010
期刊：
--
影响因子：
--
作者：
B. Indraratna
通讯作者：
B. Indraratna
DOI：
10.3724/sp.j.1235.2010.00365
发表时间：
2010-12
影响因子：
7.3
作者：
Baotian Wang;Manh Quang Vu
通讯作者：
Baotian Wang;Manh Quang Vu
影响因子：
7.4
作者：
I. Jefferson;I. Smalley
通讯作者：
I. Jefferson;I. Smalley