砂夯桩法应用天然砂混合粒化高炉矿渣的岩土工程特性

IF 2.4 Q2 GEOSCIENCES, MULTIDISCIPLINARY VIETNAM JOURNAL OF EARTH SCIENCES Pub Date : 2023-11-21 DOI:10.15625/2615-9783/19459
Nhan Nguyen Thi Thanh, Hiroshi Matsuda, Quoc Duong Trung, Thach Tran Xuan, An Tran Thi Phuong, Quynh Tran Thi Ngoc, Nhan Tran Thanh, Tien Pham Van, Huyen Nguyen Thi Le
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引用次数: 0

摘要

与天然砂相比,粒化高炉矿渣(GBFS)具有更多的优势特性,如轻质、更高的剪切强度和更高的渗透性。因此,在使用砂压实桩(SCP)方法进行地面改良时,GBFS 被视为天然砂的潜在替代品。然而,由于 GBFS 的潜在水力特性导致其凝固速度相对较快,已安装的 GBFS 压实桩(GBFSCP)的渗透性会迅速降低,因此对于低砂置换面积比(LSRAR)的 SCP 来说,这种应用变得十分困难。因此,为了减缓 GBFSCP 的渗透性降低,在日本和越南采集了不同的 GBFS 和天然砂,并通过将砂与 GBFS 的混合比从 20% 变为 80% 制备了试样。然后,首先观察了未水化的砂混合 GBFS 的基本岩土力学性能。其次,将砂-GBFS 混合物试样在温度为 80°C 的海水中固化 3 天至 380 天。测量了水化砂混合 GBFS 试样的无压抗压强度、渗透性和水化反应速率。 总之,与天然砂相比,未水化砂混合 GBFS 的岩土力学性能更具优势。此外,通过与天然砂混合,可控制 GBFS 的水化反应速率和凝固过程。这意味着可以将抗压强度和渗透性保持在预定条件下,进而满足 LSRAR SCP 方法的要求。此外,还为水合砂混合 GBFS 试样提出了一种简单的无压抗压强度估算方法。
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Geotechnical properties of natural sand-mixed granulated blast furnace slag applied to the sand compaction pile method
Granulated blast furnace slag (GBFS) has more advantageous properties over natural sand, such as lightweight, higher shear strength, and higher permeability. Therefore, it is regarded as a potentially promising substitute for natural sand in the ground improvement using the sand compaction pile (SCP) method. Due to the relatively rapid solidification, however, which is induced by the latent hydraulic property of GBFS, the permeability of the installed GBFS compaction pile (GBFSCP) decreases quickly, and such an application becomes difficult for the case of SCP with low sand replacement area ratio (LSRAR). So, to decelerate the permeability reduction of GBFSCP, different GBFSs, and natural sands were collected in Japan and Vietnam, and the specimens were prepared by changing the mixing ratio of sand to GBFS from 20% to 80%. Then, firstly, fundamental geotechnical properties of sand-mixed GBFS without hydration were observed. Secondly, the specimens of sand-GBFS mixture were cured in seawater at the temperature of 80°C for 3 days to 380 days. The unconfined compressive strength, permeability, and hydration reaction rate of the hydrated sand-mixed GBFS specimen were measured. In conclusion, the geotechnical properties of the unhydrated sand-mixed GBFS become more advantageous than those of natural sand. In addition, by mixing with natural sand, the hydration reaction rate and the solidification of GBFS are controlled. This means that it is possible to keep the compressive strength and the permeability at the predetermined conditions and, in turn, to satisfy requirements for the SCP method with LSRAR. In addition, a simple estimation method of the unconfined compressive strength was proposed for the hydrated sand-mixed GBFS specimen.
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来源期刊
VIETNAM JOURNAL OF EARTH SCIENCES
VIETNAM JOURNAL OF EARTH SCIENCES GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
3.60
自引率
20.00%
发文量
0
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