摘要
近年来真空预压法在软土地基处理中得到广泛应用,基于南京某有轨电车软土地基真空预压处理工程实例进行数值模拟研究。对比加固区沉降、孔压结果可以看出:数值模拟结果偏大于现场监测结果,误差约为2.4%~32.5%,验证了数值模型的正确性。通过变化塑料排水板的通水能力、间距、打设深度影响因素,可以看出:塑料排水板打设深度对软土表面的沉降影响较大。通过沉降和孔隙水压力估算软土的固结度分别为93.4%和88.3%,说明了真空预压法对该软土地基的加固效果明显。
Due to the requirements for the rate of settlement and the increase in the undrained shear strength upon consolidation, the vacuum preloading with vertical drains has been widely used to reinforce soft ground. A field case study improved by the vacuum preloading with vertical drains in Nanjing, China is introduced. A numerical model is established based on the field case. The measurements including vertical settlement at the surface of subsoil, multi-level settlement at the centerline of the subsoil and pore water pressure at different depths are presented and compared with the numerical results. The numerical results overestimate the measurements in the field with the differences in the range of 2.4%~32.5%, which validates the accuracy of the numerical model. By conducting the comparison analysis of parameters including length, permeability coefficient and spacing of prefabricated vertical drains (PVDs), it is found that the length of PVDs is the most influential factor for the maximum surface settlement of soft soils. The degree of consolidation at the final stage of vacuum preloading is 93.4% assessed based on the settlement, and is 88.3% estimated according to the pore water pressure. It is demonstrated that the vacuum preloading with vertical drains is an effective method to reinforce soft soils.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2016年第S1期141-146,共6页
Chinese Journal of Geotechnical Engineering
基金
国家自然科学基金面上项目(51478166)
教育部留学回国人员科研启动基金项目
中央高校基本科研业务费专项资金资助(2015B06014
2015B17814)
关键词
真空预压
塑料排水板
固结度
vacuum preloading
prefabricated vertical drains
degree of consolidation
