空气增压与直线真空预压联合处理浅层地基:实例研究

IF 2.5 3区 工程技术 Q2 ENGINEERING, CIVIL Geomechanics and Engineering Pub Date : 2021-01-01 DOI:10.12989/GAE.2021.24.2.129
Shuangxi Feng, Huayang Lei, Xiaodong Ding, G. Zheng, Yawei Jin
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引用次数: 2

摘要

真空预压法已被许多国家用于土壤改良和土地复垦。但直线真空预压法处理时间长,改善效果差。为了解决这一问题,本文提出了一种新型的空气增压与直线真空预压相结合的浅层处理方法。进行了两种传统真空预压试验和空气增压-直线联合真空预压试验,并进行了现场监测。两次试验中,预制垂直排水管深度为4.5m,排水管间距为0.8m,真空预压时间为60天。两种方法的显著区别在于,在预压时间为45天时,采用喷射压力250kpa进行增压联合直线真空预压试验,向地下注入空气。本文在监测数据的基础上,系统地研究了由叶片抗剪强度确定的力学参数、导水系数、孔隙水压力、沉降和地基承载力,论证了空气增压系统可以改善固结。固结时间缩短15 d,孔隙水压力降低至60.49%,地表沉降强度和叶片抗剪强度分别提高45.31%和6.29%。结果表明,空气增压与直线真空预压相结合的方法是有效的。与传统的真空预压相比,空气增压与直线真空预压相结合的加固效果更好。此外,还提出了平均固结度评价方法和地基承载力评价经验公式,以辅助工程决策。
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Shallow ground treatment by a combined air booster and straight-line vacuum preloading method: A case study
The vacuum preloading method has been used in many countries for soil improvement and land reclamation. However, the treatment time is long and the improvement effect is poor for the straight-line vacuum preloading method. To alleviate such problems, a novel combined air booster and straight-line vacuum preloading method for shallow ground treatment is proposed in this study. Two types of traditional vacuum preloading and combined air booster and straight-line vacuum preloading tests were conducted and monitored in the field. In both tests, the depth of prefabricated vertical drains (PVDs) is 4.5m, the distance between PVDs is 0.8m, and the vacuum preloading time is 60 days. The prominent difference between the two methods is when the preloading time is 45 days, the injection pressure of 250 kPa is adopted for combined air booster and straight-line vacuum preloading test to inject air into the ground. Based on the monitoring data, this paper systematically studied the mechanical parameters, hydraulic conductivity, pore water pressure, settlement and subsoil bearing capacity, as determined by the vane shear strength, to demonstrate that the air-pressurizing system can improve the consolidation. The consolidation time decreased by 15 days, the pore water pressure decreased to 60.49%, and the settlement and vane shear strengths increased by 45.31% and 6.29%, respectively, at the surface. These results demonstrate the validity of the combined air booster and straight-line vacuum preloading method. Compared with the traditional vacuum preloading, the combined air booster and straight-line vacuum preloading method has better reinforcement effect. In addition, an estimation method for evaluating the average degree of consolidation and an empirical formula for evaluating the subsoil bearing capacity are proposed to assist in engineering decision making.
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来源期刊
Geomechanics and Engineering
Geomechanics and Engineering ENGINEERING, CIVIL-ENGINEERING, GEOLOGICAL
CiteScore
5.20
自引率
25.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: The Geomechanics and Engineering aims at opening an easy access to the valuable source of information and providing an excellent publication channel for the global community of researchers in the geomechanics and its applications. Typical subjects covered by the journal include: - Analytical, computational, and experimental multiscale and interaction mechanics- Computational and Theoretical Geomechnics- Foundations- Tunneling- Earth Structures- Site Characterization- Soil-Structure Interactions
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