强夯在冲积层坝基处理中的应用  

Application of Dynamic Compaction in the Treatment of Alluvial Dam Foundation

作　　者：高锡良 张雄 杨立中 马勇 GAO Xiliang;ZHANG Xiong;YANG Lizhong;MA Yong(Chuxiong Xinyuan Water Conservancy and Electric Power Survey and Design Co.,LTD.,Chuxiong 675000,China)

机构地区：[1]楚雄欣源水利电力勘察设计有限责任公司,云南楚雄675000

出　　处：《云南水力发电》2024年第S01期74-76,共3页Yunnan Water Power

摘　　要：阿庆争水库是一个典型的山区小型水库。勘察发现,其河床坝基冲积层承载力低、易发生压缩变形和地震液化。对比换填法和强夯法后,选择了经济环保的强夯法处理坝基。强夯后,冲积层的干密度、承载力、密实度和剪切波速显著提高,孔隙比和渗透系数大幅降低,且不影响下游坝基排水。观测结果显示,大坝施工及封顶至今未见异常沉降变形和排水问题,有效解决了工程地质问题。此强夯处理可为类似工程提供参考。Aqingzheng Reservoir is a typical small-scale reservoir in mountainous areas.The survey found that the bearing capacity of the alluvial layer on the riverbed dam foundation is low,and it is prone to compression deformation and seismic liquefaction.After comparing the replacement method and dynamic compaction method,the economical and environmentally friendly dynamic compaction method was chosen to treat the dam foundation.After dynamic compaction,the dry density,bearing capacity,compactness,and shear wave velocity of the alluvial layer are significantly increased,while the porosity and permeability coefficient are significantly reduced without affecting the drainage of the downstream dam foundation.The observation results show that there have been no abnormal settlement deformation or drainage problems observed during the construction and topping of the dam,effectively solving the engineering geological problems.This dynamic compaction treatment can provide reference for similar projects.

关 键 词：土石坝 冲积层 强夯 地震液化 压缩变形 

分 类 号：TV52[水利工程—水利水电工程]