排灌水條件下砂黏土層變形響應模型箱試驗
發(fā)布時間：2019-05-07 11:46
【摘要】：地面沉降區(qū)野外鉆孔土層應變監(jiān)測數據表明,含水砂層上方的黏土層存在著明顯的壓應變。為研究這一現象,建立了砂黏互層小型模型箱,沿土層豎直方向埋設分布式應變監(jiān)測光纖,水位管和沉降標。開展了3次排灌水循環(huán)試驗,并監(jiān)測土層在豎直方向上的應變,水位高度和沉降量的變化。試驗結果表明:在3次排灌水循環(huán)中,土體滲透率減小,土體被壓密;黏土層存在水壓變化的滯后現象;排水過程中,黏土層中的孔隙水出現負壓,相應區(qū)域也出現顯著的壓應變。結合前人研究,分析討論了鉆孔應變數據與模型箱試驗結果,得出結論:砂層排水后,黏土層釋水和補給不平衡,導致負壓的出現,并在黏土層中產生額外的有效應力和壓縮變形。在地下水位波動時,這種效應可能會導致砂層上方的黏土層被持續(xù)緩慢壓縮。
[Abstract]:The monitoring data of the field borehole soil layer in the land subsidence area shows that the clay layer above the water-bearing sand layer has obvious compressive strain. In order to study the phenomenon, a small-scale model box for sand-adhesion is established, and distributed strain monitoring optical fiber, water level tube and settlement mark are embedded in the vertical direction of the soil layer. Three water cycle tests were carried out, and the strain, water level and settlement of the soil layer in the vertical direction were monitored. The results of the test show that the permeability of the soil is reduced and the soil mass is compacted in the three drainage and irrigation water circulation. In the process of drainage, the pore water in the clay layer has negative pressure, and the corresponding region also has significant compressive strain. The results of the experimental results of the borehole strain data and the model box are discussed in this paper. The results of the experiment are as follows: after the sand layer is drained, the water release and the make-up of the clay layer are not balanced, resulting in the occurrence of the negative pressure, and the additional effective stress and compression deformation are generated in the clay soil layer. This effect may result in a sustained and slow compression of the clay layer above the sand layer when the groundwater level fluctuates.
【作者單位】： 南京大學地球科學與工程學院;南京大學(蘇州)高新技術研究院;地質災害防治與地質環(huán)境保護國家重點實驗室(成都理工大學);
【基金】：國家自然科學基金項目(41230636,41372265,41302216) 地質災害防治與地質環(huán)境保護國家重點實驗室開放基金項目(SKLGP2015K018)
【分類號】：TU433
本文編號：2471051
[Abstract]:The monitoring data of the field borehole soil layer in the land subsidence area shows that the clay layer above the water-bearing sand layer has obvious compressive strain. In order to study the phenomenon, a small-scale model box for sand-adhesion is established, and distributed strain monitoring optical fiber, water level tube and settlement mark are embedded in the vertical direction of the soil layer. Three water cycle tests were carried out, and the strain, water level and settlement of the soil layer in the vertical direction were monitored. The results of the test show that the permeability of the soil is reduced and the soil mass is compacted in the three drainage and irrigation water circulation. In the process of drainage, the pore water in the clay layer has negative pressure, and the corresponding region also has significant compressive strain. The results of the experimental results of the borehole strain data and the model box are discussed in this paper. The results of the experiment are as follows: after the sand layer is drained, the water release and the make-up of the clay layer are not balanced, resulting in the occurrence of the negative pressure, and the additional effective stress and compression deformation are generated in the clay soil layer. This effect may result in a sustained and slow compression of the clay layer above the sand layer when the groundwater level fluctuates.
【作者單位】： 南京大學地球科學與工程學院;南京大學(蘇州)高新技術研究院;地質災害防治與地質環(huán)境保護國家重點實驗室(成都理工大學);
【基金】：國家自然科學基金項目(41230636,41372265,41302216) 地質災害防治與地質環(huán)境保護國家重點實驗室開放基金項目(SKLGP2015K018)
【分類號】：TU433
【相似文獻】
相關期刊論文 前2條
1 駱冠勇;蔡奇鵬;吳宏偉;;地層錯動引起的上覆飽和黏土層變形特性的離心試驗研究[J];巖土力學;2012年10期
2 李濤;張志紅;唐保榮;;太湖疏浚底泥堆場黏土防滲層阻隔污染物的試驗研究[J];巖土力學;2012年04期
，本文編號：2471051
本文鏈接：http://www.sikaile.net/jianzhugongchenglunwen/2471051.html
最近更新
教材專著
