花岗岩残积土水-力相互作用特性研究
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摘要
花岗岩残积土在我国东南部分布广泛,在降雨入渗作用下残积土边坡容易发生失稳破坏,研究其水-力相互作用特性对花岗岩残积土边坡的防护与治理具有重要的意义。采用瞬态脱湿与吸湿试验对花岗岩残积土的水-力相互作用特性进行研究。结果表明:花岗岩残积土原状样在脱湿条件下的进气值为3.07 kPa,在吸湿条件下的进气值为1.52 kPa;脱湿条件下获取的土样α~d、n~d、θ~d_s、K~d_s参数与吸湿条件下获取的α~w、n~w、θ~w_s、K~w_s参数存在一定差异性,这些参数的差异性决定了花岗岩残积土样水-力相互作用特性的不同;花岗岩残积土样的基质吸力和吸应力随体积含水率的增大而减小,土样的渗透系数随体积含水率的增大而增大;花岗岩残积土在相同体积含水率下,土样的干密度越大,进气值、基质吸力和吸应力越大,渗透系数越小。
The granite residual soil is widely distributed in the southeast of China.The residual soil slope is prone to instability and damage under the rainfall infiltration.The study of its hydro-mechanical interaction characteristics is of great significance to the protection and treatment of the granite residual soil slope.This paper conducts transient release and imbibition experiment to study hydro-mechanical interaction characteristics of granite residual soil.The results show that the influent value of granite residual soil under dehumidification condition is 3.07 kPa,and the influent value under hygroscopicity condition is 1.52 kPa.The parameters of α~d,n~d,θ~d_s,K~d_s obtained under dehumidification condition are different from those obtained under hygroscopicity condition.The difference of these parameters determines the difference of hydo-mechanical interaction characteristics.The matrix suction and suction stress decrease with the increase of volume water content,while the permeability coefficient increases with the increase of volume water content.Under the same volume moisture content,the greater the dry density,the greater the matrix suction and the suction stress,and the smaller the permeability coefficient.
The granite residual soil is widely distributed in the southeast of China.The residual soil slope is prone to instability and damage under the rainfall infiltration.The study of its hydro-mechanical interaction characteristics is of great significance to the protection and treatment of the granite residual soil slope.This paper conducts transient release and imbibition experiment to study hydro-mechanical interaction characteristics of granite residual soil.The results show that the influent value of granite residual soil under dehumidification condition is 3.07 kPa,and the influent value under hygroscopicity condition is 1.52 kPa.The parameters of α~d,n~d,θ~d_s,K~d_s obtained under dehumidification condition are different from those obtained under hygroscopicity condition.The difference of these parameters determines the difference of hydo-mechanical interaction characteristics.The matrix suction and suction stress decrease with the increase of volume water content,while the permeability coefficient increases with the increase of volume water content.Under the same volume moisture content,the greater the dry density,the greater the matrix suction and the suction stress,and the smaller the permeability coefficient.
引文
[1] 陈秋南,李建新,赵磊军.南岳地区花岗岩残积土微观特性研究[J].地下空间与工程学报,2015,11(S1):119-123.
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[4] 周小文,刘攀,胡黎明,等.结构性花岗岩残积土的剪切屈服特性试验研究[J].岩土力学,2015,36(s2):157-163.
[5] 邓署冬,祝方才,李大建.非饱和花岗岩残积土强度试验研究[J].土工基础,2016,30(2):269-273.
[6] 许旭堂,简文彬,柳侃.含水率和干密度对残积土抗剪强度参数的影响[J].地下空间与工程学报,2015,11(2):364-369.
[7] 汤连生,桑海涛,宋晶,等.非饱和花岗岩残积土粒间联结作用与脆弹塑性胶结损伤模型研究[J].岩土力学,2013,34(10):2877-2888.
[8] 汤连生,颜波,李振嵩,等.花岗岩残积土水土特征曲线的试验研究[J].水文地质工程地质,2008,35(4):62-65.
[9] 陈东霞,龚晓南.非饱和残积土的土-水特征曲线试验及模拟[J].岩土力学,2014,35(7):1885-1891.
[10]徐颖.强降雨作用下类土质滑坡演化过程及破坏机理研究[D].武汉:中国地质大学,2014.
[11]Gao J,Pan J.Influences of a rainfall on the stability of granite residual soil slopes[M]//Li G X,Chen Y M,Tang X W.Geosynthetics in Civil and Environmental Engineering.Berlin:Springer,2009:847-851.
[12]Qian Z,Rahardjo H,Satyanaga A.Variability in unsaturated hydraulic properties of residual soil in Singapore[J].Engineering Geology,2016,209:21-29.
[13]Hossain M A,Yin J H.Behavior of a compacted completely decomposed granite soil from suction controlled direct shear tests[J].Journal of Geotechnical & Geoenvironmental Engineering,2010,136(1):189-198.
[14]龙志东,徐一鸣,史斌,等.重塑花岗岩残积土土水特征曲线试验研究[J].公路与汽运,2017(1):118-120.
[15]陈宇龙,内村太郎.不同干密度下非饱和土土-水特征曲线[J].中南大学学报(自然科学版),2017,48(3):813-819.
[16]罗小艳.非饱和花岗岩残积土力学特性与土水特征参数贝叶斯分析[D].南昌:南昌大学,2017.
[17]谭宏大,简文星,卢游,等.赣南凝灰岩残积土水力相互作用特性研究[J].安全与环境工程,2018,25(1):18-22.
[18]Lu N,Likos W J.Rate of capillary rise in soils[J].Journal of Geotechnical and Geoenvironmental Engineering,2004,130(6):646-650.
[19]Lu N,Likos W J.Suction stress characteristic curve for unsaturated soil[J].Journal of Geotechnical and Geoenvironmental Engineering,2006,132(2):131-142.
[20]Lu N,Wayllace A,Carrera J,et al.Constant flow method for concurrently measuring soil-water characteristic curve and hydraulic conductivity function[J].Geotechnical Testing Journal,2006,29(3):256-266.
[2] 赵建军,王思敬,尚彦军,等.全风化花岗岩抗剪强度影响因素分析[J].岩土力学,2005,26(4):624-628.
[3] 肖晶晶.花岗岩残积土的结构性及应力应变关系试验研究[D].广州:华南理工大学,2012.
[4] 周小文,刘攀,胡黎明,等.结构性花岗岩残积土的剪切屈服特性试验研究[J].岩土力学,2015,36(s2):157-163.
[5] 邓署冬,祝方才,李大建.非饱和花岗岩残积土强度试验研究[J].土工基础,2016,30(2):269-273.
[6] 许旭堂,简文彬,柳侃.含水率和干密度对残积土抗剪强度参数的影响[J].地下空间与工程学报,2015,11(2):364-369.
[7] 汤连生,桑海涛,宋晶,等.非饱和花岗岩残积土粒间联结作用与脆弹塑性胶结损伤模型研究[J].岩土力学,2013,34(10):2877-2888.
[8] 汤连生,颜波,李振嵩,等.花岗岩残积土水土特征曲线的试验研究[J].水文地质工程地质,2008,35(4):62-65.
[9] 陈东霞,龚晓南.非饱和残积土的土-水特征曲线试验及模拟[J].岩土力学,2014,35(7):1885-1891.
[10]徐颖.强降雨作用下类土质滑坡演化过程及破坏机理研究[D].武汉:中国地质大学,2014.
[11]Gao J,Pan J.Influences of a rainfall on the stability of granite residual soil slopes[M]//Li G X,Chen Y M,Tang X W.Geosynthetics in Civil and Environmental Engineering.Berlin:Springer,2009:847-851.
[12]Qian Z,Rahardjo H,Satyanaga A.Variability in unsaturated hydraulic properties of residual soil in Singapore[J].Engineering Geology,2016,209:21-29.
[13]Hossain M A,Yin J H.Behavior of a compacted completely decomposed granite soil from suction controlled direct shear tests[J].Journal of Geotechnical & Geoenvironmental Engineering,2010,136(1):189-198.
[14]龙志东,徐一鸣,史斌,等.重塑花岗岩残积土土水特征曲线试验研究[J].公路与汽运,2017(1):118-120.
[15]陈宇龙,内村太郎.不同干密度下非饱和土土-水特征曲线[J].中南大学学报(自然科学版),2017,48(3):813-819.
[16]罗小艳.非饱和花岗岩残积土力学特性与土水特征参数贝叶斯分析[D].南昌:南昌大学,2017.
[17]谭宏大,简文星,卢游,等.赣南凝灰岩残积土水力相互作用特性研究[J].安全与环境工程,2018,25(1):18-22.
[18]Lu N,Likos W J.Rate of capillary rise in soils[J].Journal of Geotechnical and Geoenvironmental Engineering,2004,130(6):646-650.
[19]Lu N,Likos W J.Suction stress characteristic curve for unsaturated soil[J].Journal of Geotechnical and Geoenvironmental Engineering,2006,132(2):131-142.
[20]Lu N,Wayllace A,Carrera J,et al.Constant flow method for concurrently measuring soil-water characteristic curve and hydraulic conductivity function[J].Geotechnical Testing Journal,2006,29(3):256-266.