初始含水率对三趾马红土失水收缩特性影响
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摘要
三趾马红土胀缩特性明显,其失水收缩开裂对天然斜坡和工程边坡稳定性影响显著。利用设计的试验监测装置,开展不同初始含水状态三趾马红土重塑样的干燥脱湿试验,并运用数字图像定量处理技术获得试样干缩变形的动态定量数据,得到以下结论:(1)三趾马红土试样失水曲线呈现明显的3个阶段:快速失水期、减速失水期和残余失水期,且失水曲线受初始含水率影响显著,初始含水率越大,试样失水速率相对越快,失水过程越剧烈;(2)三趾马红土试样收缩曲线呈现明显的4个阶段:快速收缩阶段、减速收缩阶段、残余收缩阶段和零收缩阶段,且收缩曲线受初始含水率影响显著,初始含水率越大,收缩过程越剧烈,最终径向收缩应变越大;(3)三趾马红土试样的最终收缩应变与初始含水率呈良好线性关系。
The swelling and shrinkage characteristics of red soil of Hipparion were obvious,and the water shrinkage cracking had significant effect on the stability of natural slope and engineering slope.We used the designed test monitoring devices to carry out different initial moisture state hipparion red clay reshape sample drying dehumidifying test,and used digital image processing technology to obtain quantitative sample drying shrinkage deformation of dynamic quantitative data,and get the following conclusions.(1)The hipparion red soil specimen water loss curve presents obvious three stages:rapid water loss,slow water loss,and residual water loss,and water loss curve is significantly influenced by the initial moisture content,the greater the initial moisture content is,the faster the sample water loss rate is,and more intense filtration process is;(2)The hipparion red soil specimen contraction curve presents obvious four stages:rapid shrinkage phase,slow contraction phase and residual phase and zero contraction phase,and a significant contraction curve is influenced by the initial moisture content,the greater the initial moisture content is,the more intense the shrinkage process is,and the greater eventual radial shrinkage strain is;(3)The ultimate shrinkage strain and initial moisture content of the tri-toe horse red soil sample has the significantly linear relation.
The swelling and shrinkage characteristics of red soil of Hipparion were obvious,and the water shrinkage cracking had significant effect on the stability of natural slope and engineering slope.We used the designed test monitoring devices to carry out different initial moisture state hipparion red clay reshape sample drying dehumidifying test,and used digital image processing technology to obtain quantitative sample drying shrinkage deformation of dynamic quantitative data,and get the following conclusions.(1)The hipparion red soil specimen water loss curve presents obvious three stages:rapid water loss,slow water loss,and residual water loss,and water loss curve is significantly influenced by the initial moisture content,the greater the initial moisture content is,the faster the sample water loss rate is,and more intense filtration process is;(2)The hipparion red soil specimen contraction curve presents obvious four stages:rapid shrinkage phase,slow contraction phase and residual phase and zero contraction phase,and a significant contraction curve is influenced by the initial moisture content,the greater the initial moisture content is,the more intense the shrinkage process is,and the greater eventual radial shrinkage strain is;(3)The ultimate shrinkage strain and initial moisture content of the tri-toe horse red soil sample has the significantly linear relation.
引文
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[11]曲永新,王玉洲,吴芝兰,等.内蒙古中部阿巴嘎地区的三趾马(N_(2)红土及其工程特性的形成[J].工程地质学报,1995,3(4):77-85.
[12]李滨,吴树仁,石菊松,等.陕西宝鸡市三趾马红土工程地质特性及灾害效应[J].地质通报,2013,32(12):1918-1924.
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[14]唐朝生,崔玉军,Anh-minh Tang,等.土体干燥过程中的体积收缩变形特征[J].岩土工程学报,2011,33(8):1271-1279.
[15]唐朝生,王德银,施斌,等.土体干缩裂隙网络定量分析[J].岩土工程学报,2013,35(12):2298-2305.
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[17] Kleppe J H,Olson R E.Desiccation cracking of soil barriers[M]∥Hydraulic barriers in soil and rock,1985.
[18]刘春,王宝军,施斌,等.基于数字图像识别的岩土体裂隙形态参数分析方法[J].岩土工程学报,2008,30(9):1383-1388.
[19]Monteith J L.Evaporation and surface temperature[J].Quarterly Journal of the Royal Meteorological Society,2010,107(451):1-27.
[20] Kondo J,Saigusa N.A parameterization of evaporation from bare soil surfaces[J].J.Appl.Meteor,1990,29(5):385-389.
[21] Kondo J,Saigusa N,Sato T.A model and experimental study of evaporation from bare-soil surfaces[J].Journal of Applied Meteorology,2010,31(3):304-312.
[22]欧阳斌强,唐朝生,王德银,等.土体水分蒸发研究进展[J].岩土力学,2016,37(3):625-636.
[23]徐士康,唐朝生,李昊达,等.土体水分蒸发模型研究进展[J].高校地质学报,2017,23(4):640-649.
[24] Tang C S,Shi B,Liu C,et al.Experimental characterization of shrinkage and desiccation cracking in thin clay layer[J].Applied Clay Science,2011,52(1):69-77.
[25]谈云志,喻波,刘晓玲,等.压实红黏土失水收缩过程的孔隙演化规律[J].岩土力学,2015,36(2):369-375.
[2]曲永新,张永双,覃祖淼.三趾马红土与西北黄土高原滑坡[J].工程地质学报,1999,7(3):257-265.
[3]王根龙,张茂省,伍法权,等.受三趾马红土控制的黄土滑坡机理研究评述[C]∥全国工程地质大会,2012.
[4]吴圣林,许惠德.内蒙古元宝山露天煤矿三趾马红土的工程地质性质及其改良[C]∥全国工程地质大会,1996.
[5]肖荣久,赵强,邓媛华.陕西三趾马红土工程地质特性初步研究[C]∥全国工程地质大会论文选集,1992.
[6]彭淑贞,郭正堂.风成三趾马红土与第四纪黄土的黏土矿物组成异同及其环境意义[C]∥中国科学院地质与地球物理研究所2007学术论文汇编,2008:277-285.
[7]郑苗苗,郑泓,李同录.关中西部大型黄土滑坡滑带土的物理力学特性研究[J].水土保持研究,2016,23(1):343-348.
[8]张云翔,薛祥煦.甘肃武都龙家沟三趾马动物群化石的埋藏特点及该地区“三趾马红层”的成因[J].科学通报,1995,40(19):1782-1784.
[9]张子然.黄土—三趾马红土滑坡蠕变特性研究[D].西安:长安大学,2015.
[10]曹福明,刘文连.南北方红土工程地质特性对比分析:以北方三趾马红土和南方网纹红土为例[J].价值工程,2015(3):280-281.
[11]曲永新,王玉洲,吴芝兰,等.内蒙古中部阿巴嘎地区的三趾马(N_(2)红土及其工程特性的形成[J].工程地质学报,1995,3(4):77-85.
[12]李滨,吴树仁,石菊松,等.陕西宝鸡市三趾马红土工程地质特性及灾害效应[J].地质通报,2013,32(12):1918-1924.
[13]周瑞光,杨继申.三趾马红土力学性质试验研究[C]∥全国工程地质大会,1996.
[14]唐朝生,崔玉军,Anh-minh Tang,等.土体干燥过程中的体积收缩变形特征[J].岩土工程学报,2011,33(8):1271-1279.
[15]唐朝生,王德银,施斌,等.土体干缩裂隙网络定量分析[J].岩土工程学报,2013,35(12):2298-2305.
[16]袁俊平.非饱和膨胀土的裂隙概化模型与边坡稳定研究[D].南京:河海大学,2003.
[17] Kleppe J H,Olson R E.Desiccation cracking of soil barriers[M]∥Hydraulic barriers in soil and rock,1985.
[18]刘春,王宝军,施斌,等.基于数字图像识别的岩土体裂隙形态参数分析方法[J].岩土工程学报,2008,30(9):1383-1388.
[19]Monteith J L.Evaporation and surface temperature[J].Quarterly Journal of the Royal Meteorological Society,2010,107(451):1-27.
[20] Kondo J,Saigusa N.A parameterization of evaporation from bare soil surfaces[J].J.Appl.Meteor,1990,29(5):385-389.
[21] Kondo J,Saigusa N,Sato T.A model and experimental study of evaporation from bare-soil surfaces[J].Journal of Applied Meteorology,2010,31(3):304-312.
[22]欧阳斌强,唐朝生,王德银,等.土体水分蒸发研究进展[J].岩土力学,2016,37(3):625-636.
[23]徐士康,唐朝生,李昊达,等.土体水分蒸发模型研究进展[J].高校地质学报,2017,23(4):640-649.
[24] Tang C S,Shi B,Liu C,et al.Experimental characterization of shrinkage and desiccation cracking in thin clay layer[J].Applied Clay Science,2011,52(1):69-77.
[25]谈云志,喻波,刘晓玲,等.压实红黏土失水收缩过程的孔隙演化规律[J].岩土力学,2015,36(2):369-375.
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