软土地基路堤施工控制的离心模拟试验研究

›› 2009, Vol. 30 ›› Issue (5): 1253-1256.

软土地基路堤施工控制的离心模拟试验研究

周小文^{1, 2}，程展林¹，孙常青¹，饶锡保¹

1.长江科学院水利部岩土力学与工程重点试验室，武汉 430010；2.华南理工大学亚热带建筑科学国家重点试验室，广州 510640

收稿日期:2007-10-08 出版日期:2009-05-10 发布日期:2011-02-18
作者简介:周小文，男，1965年生，工学博士，教授，博士生导师，主要从事土的特性、边坡及隧道等工程研究。
基金资助:
清华大学水沙科学与水电工程重点实验室开放研究项目资助（No. Sklhse-2006-C-01）。

Centrifuge modeling construction of road embankment on soft clay ground

ZHOU Xiao-wen ^{1, 2}, CHENG Zhan-lin¹, SUN Chang-qing¹, RAO Xi-bao¹

1. Key Laboratory of Geotechnical Mechanics and Engineering of Water Resources Ministry, Yangtze River Scientific Research Institute, Wuhan 430010, China; 2. National Key Laboratory of Subtropical Architecture Science, South China University of Technlogy, Guangzhou 510640, China

Received:2007-10-08 Online:2009-05-10 Published:2011-02-18

摘要/Abstract

摘要：

软土路基上快速填筑路堤时的稳定控制是非常重要的。为此在现行规范中，采用了一些位移或位移速率的控制标准。但实践表明，采用现行的标准仍然出现一些地基失稳的事例，说明这些标准需要进一步求证和改进。除了继续收集、分析失效事例之外，通过离心模型试验也可以进一步理解堤基失稳的机制。离心模型试验结果表明：路堤快速填筑使得地基破坏时，地基变形略呈马鞍形，坡肩处沉降比道中处沉降略大，坡脚水平位移增加较快；破坏时的位移速率与现有规范建议的控制标准基本符合，但地基内的孔隙水压力是在地基进入破坏状态并发生较大变形之后才有突然增加的趋势；此外，坡脚水平位移和道中沉降的速率比，可能是一个较好的稳定性控制的指标。

关键词: 软土地基, 路堤, 控制标准, 离心模拟

Abstract:

It is generally important to maintain the stability of soft clay foundation as road embankment is rapidly filled. Some controlling standards of displacement or movement velocity are currently employed in road embankment construction regulations. But some practical cases with foundation failure show that the present controlling standards need to be reviewed and improved to ensure the construction safety. Besides collecting more engineering data, centrifugal modeling test should be a helpful way to get more understanding about the soft foundation failure. A centrifugal test performed by authors is described. Some insights are drawn from this test: (1) as foundation enters shear failure state, foundation settlement takes a horse-saddle shape, i.e. the settlement under road shoulders being larger than that under road center; and slope toe horizontal displacement increases rapidly; (2) pore water pressure in foundation increases remarkably only after foundation has taken a large deformation; (3) the displacement velocity of foundation is basically in agreement with the value of controlling standard in construction regulation; (4) the ratio of horizontal displacement at embankment slope toe to settlement under road center, may be an acceptable standard in construction stability control.

Key words: soft soil foundation, road embankment, controlling standard, centrifuge modeling

中图分类号:

TU 411

周小文，程展林，孙常青，饶锡保. 软土地基路堤施工控制的离心模拟试验研究[J]. , 2009, 30(5): 1253-1256.

ZHOU Xiao-wen, CHENG Zhan-lin, SUN Chang-qing, RAO Xi-bao. Centrifuge modeling construction of road embankment on soft clay ground[J]. , 2009, 30(5): 1253-1256.

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