一软基上的坝基长期变形性状分析  

Analysis for Long-term Deformations of a Dam Built on Soft Soil Foundation

作　　者：刘世明[1] 胡士兵[1] 孙少君 

机构地区：[1]华东勘测设计研究院有限公司,杭州310014 [2]慈溪市杜湖水库管理局,浙江宁波315300

出　　处：《科技通报》2016年第11期94-99,共6页Bulletin of Science and Technology

摘　　要：长期荷载作用下软土地基的变形性状广为工程与学术界关注,长期变形与软土的次固结有关,有关粘性土次固结变形机理,学术界已开展了大量试验和理论研究,取得了不少成果。相对而言,工程性状分析,尤其是长期荷载作用下软粘土地基变形大小及其发展趋势的报道相对较少。我国第一个在软土地基上成功采用砂井排水固结法加固地基建成的杜湖大坝,自1972年投入使用以来已安全运行40余年,积累了较为完整的大坝坝基沉降与边桩水平位移等监测数据。本文在总结前人软土主、次固结变形研究成果基础上,对杜湖大坝的长期沉降和边桩水平位移加以整理,从随时间发展模式和变形有限终值两方面考虑,分析了坝基沉降和坝体水平位移随时间长期发展模式,提出了一种预测长期沉降的经验估算法,探讨了坝基变形形态随时间的发展规律。The deformations of soft soil due to long- term load have been paid more attention by engineering and academic circles. Long- term deformation of soft soil is related to secondary consolidation. Many studies have been developed for mechanism of secondary consolidation by scholars,obtained abundant results. Analyze about engineering properties are comparatively rare, especially to the deformations caused by long-term loads. The Duhu dam in which the sand-wells drainage-consolidation was applied in China, has been put into operation more than 40 years from 1972, and lot of valuable measured data are accumulated. In this paper, the long term deformation behaviors of the Duhu dam foundation, and the dam foundation deformation patter are analyzed. The fitting analysis with measured data shows that the results obtained by the put forwarded method in this paper are reasonable.

关 键 词：次固结变形 长期沉降 水平位移 变形形态 

分 类 号：TU473[建筑科学—结构工程]