含黏土封层泥岩路堤含水率变化规律及预估模型
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摘要
在泥岩路堤修筑过程中为降低降雨入渗对泥岩路堤影响,根据持续降雨入渗模型计算比较了路堤表层铺设粉土封层、黏土封层的阻渗效果,进行室内试验定量分析了相同降雨条件下黏土封层、降雨后晾晒时间、泥岩风化程度、黏土封层厚度、路堤深度5种因素对泥岩路堤含水率的影响,依据灰理论计算了各因素与路堤含水率的关联度排序,统计回归提出泥岩路堤含水率预估模型。研究结果表明:黏土封层的铺设能明显降低路堤表层降雨入渗速率,削弱泥岩风化程度和晾晒时间对路堤含水率的影响,具有较好的阻渗作用;各因素对路堤含水率的影响程度排序为:黏土封层厚度、路堤深度、晾晒时间、风化程度。黏土封层的最佳铺设厚度随降雨强度的增大而增大,一般推荐厚度以20 cm为宜;根据预估公式反算出雨后泥岩路堤拥有最佳施工含水率的层位。推荐翻挖至该层位后再恢复施工,节约工程量和时间。经试验路检测及统计分析知,中等降雨强度条件下,泥岩路堤含水率预估值与实测值相对误差较小且满足工程要求。本研究成果不仅对安徽地区泥岩路堤修筑具有工程指导意义,非安徽地区的泥岩路堤修筑亦可参考本研究的规律和结论。
In order to reduce the influence of rain infiltration on the mudstone embankment during the construction of mudstone embankment,the continuous rainfall infiltration model is used to analyse and compare the water-blocking effect of the silt seal coat and clay seal coat. Laboratory experimental quantitative study on the 5 influencing factors on the moisture content of mudstone embankment,including clay seal coat,drying time,weathering degree of mudstone,thickness of clay seal coat and depth of embankment,is conducted. According to the grey theory,the correlations of embankment moisture content with different influencing factors are calculated and sequenced,and the forecast model of mudstone embankment moisture content is proposed by statistical regression. The result indicates that( 1) The clay seal coat can obviously reduce the rainfall infiltration rate of embankment,weaken the influence of weathering degree of mudstone and drying time on the moisture content of embankment,which shows a good water-blocking performance.( 2) The impacts of each influencing factor on moisture content size successively: thickness of clay seal coat,depth of embankment,drying time,weathering degree of mudstone.( 3) The optimum thickness of clay seal increases with the increase of rainfall intensity,and the recommended thickness is 20 cm. The depth ofmudstone under the condition of the optimum moisture content after raining can be calculated according to prediction model. It is recommended to excavate to the specific layer before resuming construction to save engineering quantity and time. According to statistical investigation and test of test road,the relative errors between predicted values and measured values of moisture content under the condition of moderate rainfall intensity are little and research result could meet the demands of the engineering. The research can be a good guidance to the mudstone embankment construction in Anhui Province and the result provides a reference to the mudstone embankment construction in other regions.
In order to reduce the influence of rain infiltration on the mudstone embankment during the construction of mudstone embankment,the continuous rainfall infiltration model is used to analyse and compare the water-blocking effect of the silt seal coat and clay seal coat. Laboratory experimental quantitative study on the 5 influencing factors on the moisture content of mudstone embankment,including clay seal coat,drying time,weathering degree of mudstone,thickness of clay seal coat and depth of embankment,is conducted. According to the grey theory,the correlations of embankment moisture content with different influencing factors are calculated and sequenced,and the forecast model of mudstone embankment moisture content is proposed by statistical regression. The result indicates that( 1) The clay seal coat can obviously reduce the rainfall infiltration rate of embankment,weaken the influence of weathering degree of mudstone and drying time on the moisture content of embankment,which shows a good water-blocking performance.( 2) The impacts of each influencing factor on moisture content size successively: thickness of clay seal coat,depth of embankment,drying time,weathering degree of mudstone.( 3) The optimum thickness of clay seal increases with the increase of rainfall intensity,and the recommended thickness is 20 cm. The depth ofmudstone under the condition of the optimum moisture content after raining can be calculated according to prediction model. It is recommended to excavate to the specific layer before resuming construction to save engineering quantity and time. According to statistical investigation and test of test road,the relative errors between predicted values and measured values of moisture content under the condition of moderate rainfall intensity are little and research result could meet the demands of the engineering. The research can be a good guidance to the mudstone embankment construction in Anhui Province and the result provides a reference to the mudstone embankment construction in other regions.
引文
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[15]朱青青,苗强强,陈正汉,等.考虑基质势影响的非饱和土水分运移规律测试系统研制[J].岩土工程学报,2016,38(增2):240-244.ZHU Qing-qing,MIAO Qiang-qiang,CHEN Zheng-han,et al.Development of Test System for Unsaturated Soil Water Movement Law Considering Influence of Matrix Potential[J].Chinese Journal of Geotechnical Engineering,2016,38(S2):240-244.
[15]董金梅,朱华,边疆,等.高分子材料改性粉土力学特性试验研究及机制探讨[J].岩石力学与工程学报,2014,32(增2):4326-4333.DONG Jin-mei,ZHU Hua,BIAN Jiang,et al.Experimental Research on Mechanics Characteristics and Mechanism of Silty Soil Modified by Polymer Material[J].Chinese Journal of Rock Mechanics and Engineering,2014,32(S2):4326-4333.
[17]王改玲,王青杵,石生新.晋北黄土区降雨特征及其对坡地土壤侵蚀的影响[J].水土保持学报,2013,27(1):1-5.WANG Gai-ling,WANG Qing-chu,SHI Sheng-xin.Rainfall Characters and Its Effect on Loess Slopeland Erosion in Northern Shanxi Province[J].Journal of Soil and Water Conservation,2013,27(1):1-5.
[18]谈云志,孔令伟,郭爱国,等.红黏土路基填筑压实度控制指标探讨[J].岩土力学,2010,31(3):851-855.TAN Yun-zhi,KONG Ling-wei,GUO Ai-guo,et al.Discussion on the compaction degree index of subgrade filled with laterite[J].Rock and Soil Mechanics,2010,31(3):851-855.
[2]邓华锋,周美玲,李建林,等.水-岩作用下红层软岩力学特性劣化规律研究[J].岩石力学与工程学报,2016,35(增2):3481-3491.DENG Hua-feng,ZHOU Mei-ling,LI Jian-lin,et al.Mechanical Properties Deteriorating Change Rule Research of Red-layer Soft Rock under Water-rock Interaction[J].Chinese Journal of Rock Mechanics and Engineering,2016,35(S2):3481-3491.
[3]张莎莎,杨晓华,王明皎,等.泥质软岩土石混合料弃渣路用性能研究[J].公路交通科技,2015,32(2):55-59.ZHANG Sha-sha,YANG Xiao-hua,WANG Ming-jiao,et al.Study on Road Performance of Argillaceous Soft Rock Earth Mixture Spoil[J].Journal of Highway and Transportation Research and Development,2015,32(2):55-59.
[4]柴肇云,张亚涛,张学尧.泥岩耐崩解型与矿物组成相关性的试验研究[J].煤炭学报,2015,40(5):1188-1193.CHAI Zhao-yun,ZHANG Ya-tao,ZHANG Xue-yao.Experimental Investigations on Correlation with Slake Durability and Mineral Composition of Mudstone[J].Journal of China Coal Society,2015,40(5):1188-1193.
[5]CAICEDO B,ESPITIA J M,VALLEJO L.Hydromechanical Behaviour of Unsaturated Argillaceous Rocks[M].Anon.Numerical Modelling of Liquefaction Tests of Partially Saturated Sands in CSSLB.Cham:Springer International Publishing,2017:3-13.
[6]杨建林,王来贵,李喜林,等.粉砂质泥岩遇水损伤规律及化学改性研究[J].硅酸盐通报,2016,35(6):1883-1890.YANG Jian-lin,WANG Lai-gui,LI Xi-lin,et al.Damage-law of Silty-mudstone in Water and Chemical Modification[J].Bulletin of the Chinese Ceramic Society,2016,35(6):1883-1890.
[7]杨建林,王来贵,李喜林,等.露天矿泥岩路基双重改性研究[J].岩土工程学报,2015,37(8):1469-1477.YANG Jian-lin,WANG Lai-gui,LI Xi-lin,et al.Double Modification for Mudstone Roadbed of Open Pit Mines[J].Chinese Journal of Geotechnical Engineering,2015,37(8):1469-1477.
[8]柴肇云,郭卫卫,康天合,等.有机硅材料改性泥岩物性变化规律研究[J].岩石力学与工程学报,2013,32(1):168-175.CHAI Zhao-yun,GUO Wei-wei,KANG Tian-he,et al.Change Rules of Physical Property of Argillaceous Rock for Organic Silicon Material Modified[J].Chinese Journal of Rock Mechanics and Engineering,2013,32(1):168-175.
[9]付宏渊,邱祥,李光裕,等.降雨入渗条件下炭质泥岩路堤动态稳定性[J].长安大学学报:自然科学版,2017,37(1):33-42.FU Hong-yuan,QIU Xiang,LI Guang-yu,et al.Dynamic Stability of Carbonaceous Mudstone Embankment under Rainfall Infiltration[J].Journal of Chang'an University:Nature Science Edition,2017,37(1):33-42.
[10]RIGBY J R,PORPORATO A.Simplified Stochastic Soilmoisture Models:A Look at Infiltration[J].Hydrology and Earth System Sciences Discussions,2006,10(6):861-871.
[11]陈开圣,胡鑫.高液限红粘土变形特性研究[J].公路交通科技,2010,27(3):49-55.CHEN Kai-sheng,HU Xin.Study of Deformation Characteristic for High Liquid Limit Red Clay[J].Journal of Highway and Transportation Research and Development,2010,27(3):49-55.
[12]杨进兵,陈兴长,汪惠,等.泥石流堆积物中细颗粒含量与渗透系数关系试验研究[J].岩土力学,2016,37(11):1-7.YANG Jin-bing,CHEN Xing-zhang,WANG Hui,et al.An Experimental Study of Relationship between Fine Grain Content and Permeability Coefficient of Debris Flow Deposits[J].Rock and Soil Mechanics.2016,37(11):1-7.
[13]洪宝宁,化君晖,刘鑫,等.高液限土路堤填筑的双指标控制方法研究[J].岩土力学,2016,37(增1):255-262.HONG Bao-ning,HUA Jun-hui,LIU Xing,et al.Research on Quality Control Method with Two Indices for Embankment Filled with High Liquid Limit Soil[J].Rock and Soil Mechanics,2016,37(S1):255-262.
[14]张国炳,余概宁.高液限土的改良技术研究[J].公路交通科技,2005,22(11):71-74.ZHANG Guo-bing,YU Gai-ning.Study on Study on Improvement of High Liquid Limit Soil[J].Journal of Highway and Transportation Research and Development,2005,22(11):71-74.
[15]朱青青,苗强强,陈正汉,等.考虑基质势影响的非饱和土水分运移规律测试系统研制[J].岩土工程学报,2016,38(增2):240-244.ZHU Qing-qing,MIAO Qiang-qiang,CHEN Zheng-han,et al.Development of Test System for Unsaturated Soil Water Movement Law Considering Influence of Matrix Potential[J].Chinese Journal of Geotechnical Engineering,2016,38(S2):240-244.
[15]董金梅,朱华,边疆,等.高分子材料改性粉土力学特性试验研究及机制探讨[J].岩石力学与工程学报,2014,32(增2):4326-4333.DONG Jin-mei,ZHU Hua,BIAN Jiang,et al.Experimental Research on Mechanics Characteristics and Mechanism of Silty Soil Modified by Polymer Material[J].Chinese Journal of Rock Mechanics and Engineering,2014,32(S2):4326-4333.
[17]王改玲,王青杵,石生新.晋北黄土区降雨特征及其对坡地土壤侵蚀的影响[J].水土保持学报,2013,27(1):1-5.WANG Gai-ling,WANG Qing-chu,SHI Sheng-xin.Rainfall Characters and Its Effect on Loess Slopeland Erosion in Northern Shanxi Province[J].Journal of Soil and Water Conservation,2013,27(1):1-5.
[18]谈云志,孔令伟,郭爱国,等.红黏土路基填筑压实度控制指标探讨[J].岩土力学,2010,31(3):851-855.TAN Yun-zhi,KONG Ling-wei,GUO Ai-guo,et al.Discussion on the compaction degree index of subgrade filled with laterite[J].Rock and Soil Mechanics,2010,31(3):851-855.
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