工程地质学报2017，Vol.25Issue(6)：1455-1464,10.DOI:10.13544/j.cnki.jeg.2017.06.008
基于DFOS的排灌水条件下土体变形响应模型试验研究
DFOS BASED EXPERIMENTAL STUDY OF SOIL DEFORMATION RESPONSE TO DRAINAGE AND RECHARGE
摘要
Abstract
Under the effect of intense exploitation of groundwater,the multi-layer soil of clayey soil and sandy soil is susceptible to be compressed,which causes the land subsidence disaster.To better understand the mechanism of land subsidence caused by groundwater withdrawal,a small-scale sand-clay interbred model box is built to carry out the consolidation and rebound tests.Distributed fiber optical sensing (DFOS)technologies are introduced for coupling monitoring of soil strain and water content to analyze the response characteristics of each layer to water level changes.The results indicate that soil layers are compressed during drainage while rebound during recharge.In addition,the deformation of clay layer is obvious than that of sand layer.The deformation of sand layer is synchronous with water content changes,while that of clay layer is slightly lagging behind the water content changes due to its lower coefficient of permeability.The segmented compression curve of clay layer shows that water content rapidly decreases when it is lower than its liquid limit,meanwhile the clay layer compression rate obviously accelerates during drainage.When water content is higher than that of its liquid limit during recharge,rebound rate significantly increases.The test results are of great significance to study the mechanism of land subsidence as well as to evaluate the compression potential of soil layers.关键词
地面沉降/土体应变/分布式光纤监测/水土耦合Key words
Land subsidence/Soil strain/Distributed fiber optical sensing(DFOS)/Soil and water coupling分类
天文与地球科学引用本文复制引用
吴静红,施斌,曹鼎峰,姜洪涛,王雪帆,尹建华..基于DFOS的排灌水条件下土体变形响应模型试验研究[J].工程地质学报,2017,25(6):1455-1464,10.基金项目
国家自然科学基金项目(41372265),国家自然科学基金重点项目(41230636)资助. （41372265）
