宁南黄土丘陵区某土坝工后裂缝成因分析  

Cause analysis on post-construction cracking of earth dam in loess hilly area in southern Ningxia

作　　者：杨旭[1,2] 王红雨[1,2] 

机构地区：[1]宁夏大学土木与水利工程学院,宁夏银川750021 [2]宁夏节水灌溉与水资源调控工程技术研究中心,宁夏银川750021

出　　处：《宁夏工程技术》2013年第1期44-48,共5页Ningxia Engineering Technology

基　　金：教育部科学技术研究重点项目(207126)

摘　　要：宁南某水库首次蓄水后坝体出现数条宽度15—50mm的裂缝，在分析该工程勘察设计与施工资料的基础上，选取了3个桩号的典型横剖面，分别采用分层总和法和有限元法对坝体沉降变形进行了模拟计算，并将计算值与土坝变形实际观测数据进行对比分析．结果表明，坝体工后裂缝的主要原因是坝基湿陷性黄土及沟壑处理不彻底导致坝体不均匀沉降，进而产生裂缝．15 to 50 millimeter cracks were found in the earth dam from southern Ningxia after the reservoir was impounded at first time. Three typical sections were selected to calculate by using layerwise summation method and FEM based on analyzing the information of subject survey, design and construction. Then, the calculating data were compared with the site survey data. The results showed that the post-construction cracking is due to asymmetry settlement from incomplete firming for the collapsible loess and gully in the earth dam foundation.

关 键 词：土坝裂缝 自重湿陷性黄土 分层总和法 有限元法 不均匀沉降 

分 类 号：TV641.2[水利工程—水利水电工程]