务坪水库软基筑坝基础处理技术  

Foundation improvement techniques applied on a soft clay foundation of Wuping Dam

作　　者：陈祖煜[1] 周晓光[1] 陈立宏[2] 张天明 

机构地区：[1]中国水利水电科学研究院岩土工程研究所,北京100044 [2]北京交通大学土建学院,北京100044 [3]云南省水利水电勘测设计院,云南昆明650021

出　　处：《中国水利水电科学研究院学报》2004年第3期167-171,178,共6页Journal of China Institute of Water Resources and Hydropower Research

摘　　要：本文通过离心物理模型试验、有限元固结计算、坝坡稳定数值分析和振冲碎石桩生产性试验,确认了振冲碎石桩加固软基、修筑14m高的反压平台预压固结和分期施工综合应用方案修建务坪水库的可行性与有效性。经过精心设计和施工,2001年5月大坝顺利封顶,目前运行正常,表明振冲碎石桩处理软基是成功的。The 52m high Wuping rockfill dam was constructed on a fully saturated soft clay foundation in Yunnan Province of China. The 33m deep foundation material is comprised of lacustrine silty clay with landslide deposit. In order to improve the engineering properties of the foundation, the technique of vibro replacement and preloading was adopted. The geological properties of the foundation materials, based on field and laboratory testing results, were poor, and the c_u was less than 20kPa.Centrifuge model test, two-dimensional consolidation calculation based on Biot Theory and stability analysis by limit equilibrium theory were carried out to verify the effects of foundation improvement technique. While vibrofloatation testing piles were built in a 340m^2 area in field to find out the optimum construction parameters. The construction of dam and the management of the reservoir showed that the improvement technique adopted in Wuping project was effective.

关 键 词：软基 振冲 碎石桩 离心模型 

分 类 号：TV223[水利工程—水工结构工程]