塑料排水板处理软基侧向变形规律及预测模型

发布时间：2018-02-25 07:04

本文关键词： 软土路基塑料排水板侧向变形规律 “S”形曲线预测模型　出处：《工程地质学报》2014年02期 　论文类型：期刊论文

【摘要】：探讨西南地区软土路基经塑料排水板方式处理后,路基侧向变形的规律。基于四川省遂一资高速公路软土路基沉降变形监测的数据,对土体侧向变形随深度、侧向变形随时间的变化规律进行统计分析,并根据其变化特征,分别提出相应的预测模型。研究表明:(1)在路堤填筑过程中侧向水平位移近地表处(0.15~0.3倍软基厚度)侧向位移变化剧烈;(2)侧向水平位移随时间存在3种变化关系:填筑前期为△y_m=△S_D,路堤填筑从临界填筑高度到设计填筑高度的过程为△y_m=0.15△S_D,填筑完成后为△y_m=0.3△S_D。最大侧向水平位移随时间大致呈"S"形曲线分布;(3)根据侧向水平位移随深度变化特点、侧向水平位移随时间变化特点,分别提出y(z)=ae~(-λz)(bsinλz+ccosλz)、y(t)=a/(1+e~(b-c·t·r))模型进行预测,预测结果与实测数据较为吻合。
[Abstract]:This paper discusses the regularity of lateral deformation of soft soil roadbed in southwest China after treatment with plastic drainage board. Based on the monitoring data of settlement and deformation of soft soil roadbed in Suiyi expressway of Sichuan Province, the lateral deformation of soil with depth is studied. The variation law of lateral deformation with time is analyzed statistically, and according to its changing characteristics, The research shows that the lateral horizontal displacement near the surface of the embankment is 0. 15 ~ 0. 3 times the thickness of the soft foundation.) the lateral displacement changes sharply and there are three relationships between the lateral displacement and the time: the horizontal displacement of the embankment varies with time:. The process of embankment filling from the critical filling height to the design filling height is YMK 0.15 SD, and after the completion of the filling, it will be yflesh m0. 3 SSD. The maximum lateral horizontal displacement will be approximately "S" curve distribution over time. (3) according to the lateral water, the maximum lateral horizontal displacement will be distributed approximately in "S" shape. The variation of horizontal displacement with depth, According to the characteristics of lateral horizontal displacement with time variation, the model of Y ~ (ZZ) ~ B ~ (sin) 位 z ccos 位 ~ (zn) ~ (1) / 1 eau ~ (b) -c 路t 路r ~ (1) is put forward, and the predicted results are in good agreement with the measured data.
【作者单位】：地质灾害防治与地质环境保护国家重点实验室成都理工大学环境与土木工程学院;
【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)资助
【分类号】：U416.1

【相似文献】