吹填土砂井地基离心模型试验研究

来源期刊:中南大学学报(自然科学版)2021年第4期

论文作者:贺勇 陈科平 任新开 吴丹伟

文章页码:1222 - 1232

关键词:吹填土;真空预压;等效替代;土工离心

Key words:dredger fill; vacuum preload; equivalent replacement; geotechnical centrifuge

摘    要:采用土工离心试验方法,结合现场测试,研究吹填陆域真空预压后的固结沉降特性。研究研究表明:离心试验中相邻砂井连线中心沉降为对角砂井连线中心沉降的87%,地表最终沉降和现场监测结果基本一致,两者沉降稳定在300 mm左右;现场真空预压前期地表沉降速率比模型试验地表沉降速率快,中期沉降速率相近,后期沉降均稳定;离心试验中孔隙水压力缓慢下降,而现场孔隙水压力为先下降后上升再缓慢下降,由于排水方式不同,离心试验孔隙水压力和现场孔隙水压力表现规律不同;所得出的沉降规律可为吹填陆域后续施工提供参考。

Abstract: The characteristics of consolidation settlement after vacuum preloading in land fill was studied by geotechnical centrifugal test and field test. The results show that the center settlement of one-dimensional foundation is 87% of that of the center settlement of two-dimensional foundation in the centrifugal test. The final surface settlement is basically consistent with the field monitoring results, and the settlement of both is stable at about 300 mm. In the early stage of field vacuum preloading, the surface settlement rate is faster than that of the model test, the intermediate settlement rate is similar, and the later settlement rate is stable. In the centrifugal test, the pore water pressure dectrases slowly, while in the field, the pore water pressure first decreases, then increases and then slowly decreases. Due to the different drainage methods, the performance of the two kinds of pressure is different. The settlement law proposed by the study can provide some reference for the subsequent construction of the land filling area.

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