铁道建筑技术
鐵道建築技術
철도건축기술
Railway Construction Technology
2015年
11期
98-101
,共4页
膨胀土%土水特征曲线%大尺寸渗析法%气相法
膨脹土%土水特徵麯線%大呎吋滲析法%氣相法
팽창토%토수특정곡선%대척촌삼석법%기상법
expansive soil%soil-water characteristic curve%large size osmotic method%vapor phase technique
土水特征曲线(SWCC)作为表征非饱和土吸力与含水率关系的重要参数是研究非饱和土的关键,对于膨胀土而言,土水特征曲线又是分析其膨胀性能的重要指标。本文以扬州瘦西湖隧道下蜀黏土为研究对象,通过大尺寸渗析法和气相法两种方法测量了其土水特征曲线,在低吸力范围内(0~160 MPa)曲线存在明显回滞现象。结合3种不同数学模型对曲线进行拟合分析,发现 Fredlund and Xing 公式拟合最为准确。利用扫描电镜分析了不同含水率条件下的细观特征,试验表明:随着含水率的增加,下蜀黏土中的蒙脱石颗粒不断吸水膨胀,从而填充土体孔隙。
土水特徵麯線(SWCC)作為錶徵非飽和土吸力與含水率關繫的重要參數是研究非飽和土的關鍵,對于膨脹土而言,土水特徵麯線又是分析其膨脹性能的重要指標。本文以颺州瘦西湖隧道下蜀黏土為研究對象,通過大呎吋滲析法和氣相法兩種方法測量瞭其土水特徵麯線,在低吸力範圍內(0~160 MPa)麯線存在明顯迴滯現象。結閤3種不同數學模型對麯線進行擬閤分析,髮現 Fredlund and Xing 公式擬閤最為準確。利用掃描電鏡分析瞭不同含水率條件下的細觀特徵,試驗錶明:隨著含水率的增加,下蜀黏土中的矇脫石顆粒不斷吸水膨脹,從而填充土體孔隙。
토수특정곡선(SWCC)작위표정비포화토흡력여함수솔관계적중요삼수시연구비포화토적관건,대우팽창토이언,토수특정곡선우시분석기팽창성능적중요지표。본문이양주수서호수도하촉점토위연구대상,통과대척촌삼석법화기상법량충방법측량료기토수특정곡선,재저흡력범위내(0~160 MPa)곡선존재명현회체현상。결합3충불동수학모형대곡선진행의합분석,발현 Fredlund and Xing 공식의합최위준학。이용소묘전경분석료불동함수솔조건하적세관특정,시험표명:수착함수솔적증가,하촉점토중적몽탈석과립불단흡수팽창,종이전충토체공극。
Soil-water characteristic curve (SWCC)is the key to reflect the relationship between matric suction and mois-ture content of unsaturated soil.As for expansive soil,SWCC is also an important indicator to represent its expansion per-formance.In this paper,SWCC of Xiashu clay in Slender West Lake Tunnel of Yangzhou is measured by large size osmotic method and vapor phase technique,it shows obvious hysteresis phenomenon during lower matric suction (0 ~160MPa). Fitting it with three kinds of mathematical model,Fredlund and Xing formula is found to be matched best.The meso-char-acteristics under different moisture conditions are analyzed through scanning electron microscope.Tests show that with the increase of moisture content,montmorillonite granules are continuously expanding and thus the soil pores between them can be filled.