塑料排水板处理后软土地基临界高度研究  

Research on critical height of soft soil subgrade treated by plastic drainage plate

作　　者：陈继彬[1,2] 赵其华[1,2] 彭社琴[1,2] 黎玺克 

机构地区：[1]地质灾害防治与地质环境保护国家重点实验室,四川成都610059 [2]成都理工大学环境与土木工程学院,四川成都610059 [3]甘肃铁道综合工程勘察院有限公司,甘肃兰州730000

出　　处：《水文地质工程地质》2014年第1期84-89,共6页Hydrogeology & Engineering Geology

基　　金：国家重点基础研究发展计划(2011CB013501);长江学者和创新团队发展计划(IRT0812)

摘　　要：考虑经塑料排水板处理后,路堤在填筑过程中孔压消散导致地基土强度提高所引起临界填筑高度发生变化,修正Leroueil和Tavenas提出的临界高度计算模型,结合四川省遂资高速公路软基变形监测数据进一步验证了计算模型的可行性.研究表明：（1）在填筑过程中,实测地表沉降曲线的拐点和沉降速率的加速点即为临界高度.实测沉降-填筑高度曲线在临界高度前后皆可看成线性变化;（2）由于固结时间t、现场取样条件的差异,修正计算所得临界高度较观测得到临界高度相差±（0.1～0.3）m,计算值总体偏高;（3）利用成对t检验法对数据进行检验,得出t＜t0.05,22=2.074,观测值与计算值差异性不显著.Factors such as soil＇ s strength improvement under embankment load are taken into consideration in this paper. Based on the consolidation theory, the critical height is evaluated to correct the formula proposed by Leroueil and Tavenasin. The settlement deformation observation data of the soft ground distributed along the Suining-Ziyang expressway in Sichuan is combined determine the critical height of soft soil subgraded by plastic drainage plate. The research results show that （ 1 ） during construction, settlement vs embankment has an inflection point, and at the same time the settlement rate has an acceleration point. In this study the critical height is determined with this height. Observed settlement data vs embankment height-curve can be found as two linear variations before and after the critical height; （2） the critical height data between calculation and observed is ±（0. 1 - 0.3） m, because the consolidation time （t） and the sampling conditions have some adverse effect, and the former is usually higher; （3） at the same time paired t test is applied to test the observed vs calculated data, and the result is t 〈 t0.05.22, and the difference of observed vs calculated data is not remarkable.

关 键 词：塑料排水板 软土地基 临界高度 固结度 成对t检验 

分 类 号：TU443[建筑科学—岩土工程]