振冲碎石桩复合地基的等效渗透系数计算方法

发布时间：2018-02-26 18:26

本文关键词： 振冲碎石桩复合地基等效渗透系数有限元法　出处：《水电能源科学》2017年11期 　论文类型：期刊论文

【摘要】：振冲碎石桩法是水利工程常用的地基加固方法,其加固形成的复合地基涉及到桩体及其桩间土等多种材料及扰动挤密作用影响等,渗流特性复杂。对此,结合某水电站工程实际,依据振冲碎石桩布置及复合地基桩体和桩间土的特性和面积比例,考虑扰动挤密作用对渗透特性的影响,提出了振冲碎石桩复合地基的等效渗透系数计算方法,从渗透流量和位势分布等渗流要素,并采用三维有限元法,计算比较了真实模型(实际参数)、复合地基模型(等效渗透系数)两种模型坝体和坝基的渗流场。结果表明,采用复合地基等效渗透系数计算的坝体和坝基渗流场基本符合精细模拟振冲碎石桩时计算的渗流场,可见该方法合理、有效,可用于类似工程渗流场的计算分析。
[Abstract]:Vibro-impact gravel pile method is a common method for foundation reinforcement in water conservancy projects. The composite foundation formed by the method involves a variety of materials, such as pile body and soil between piles, and the effect of disturbance and compaction, and the seepage characteristics are complex. According to the actual situation of a hydropower station, according to the layout of vibrating-impact gravel pile, the characteristics and area ratio of pile body and soil between piles, the influence of disturbance compaction on permeability is considered. In this paper, the equivalent permeability coefficient calculation method of vibrating-impact gravel pile composite foundation is put forward. The seepage factors such as seepage flow and potential distribution are analyzed, and the three-dimensional finite element method is used. The seepage field of dam body and dam foundation is calculated and compared with the real model (real parameter) and composite foundation model (equivalent permeability coefficient). The results show that, The seepage field of dam body and dam foundation calculated by using equivalent permeability coefficient of composite foundation is basically consistent with the seepage field calculated by fine simulation of vibration-flushing gravel pile. It can be seen that this method is reasonable and effective and can be used for the calculation and analysis of seepage field in similar projects.
【作者单位】：河海大学水利水电学院;西藏自治区江孜县水利队;
【分类号】：TV223.6

【相似文献】