重复压缩-回弹条件下土石混填体变形规律与压实指标相关性试验研究
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摘要
从湖南省龙(山)—永(顺)高速公路大坝隧道弃碴填筑体取样,开展土石混填体压实模拟及压实评价指标室内对比试验。研究结果表明:土石混填体压缩曲线呈上凸型;回弹曲线平缓圆滑,呈微下凹型;第i+1次压缩回弹曲线均位于第i次曲线下方,线形相似;土石混填体变形具有记忆效应;湿化对土石(灰岩)混填体压实变形特征影响不明显;分级加载比1次加载产生的变形大;随着循环荷载和加载次数增加,累积总变形、累积塑性变形和累积塑性变形率增大,压缩5次基本不再增大;分级总变形、分级塑性变形和分级塑性变形率随加载次数增加而减小,减小率也不断减小;当循环荷载超过400 kPa时,分级总变形、分级塑性变形和分级塑性变形率基本接近;在工地碾压过程中,采用高吨位压路机或者轻重机具组合碾压5次,能有效提高土石混填体的压实度;压实评价指标K30(地基系数)、Ev1(静态变形模量)与e(孔隙比)具有较好的相关性,Ev2(静态变形模量)、Evd(动态变形模量)与e(孔隙比)的相关性较差;K30和Ev1可作为土石混填体压实质量评价指标。
Samples were obtained from the Daba tunnel of the Longyong highway in Hunan Province, and compaction simulating and comparative test of compaction quality indexes were carried out. The results show that the compression curves of soil rock mixture are overall convex type in plate loading test, and the rebound curves are smooth and slightly concave type. The(i+1)th compression-rebound curve is located below the ith curve, and has the similar linearity. The over-pressure curve has memory effect. The effect on wetting compaction deformation characteristics of soil-rock(limestone) mixture is not obvious. The deformation caused by the step loading is larger than that of the single loading. All of the cumulative total deformation and cumulative plastic deformation and ratio of accumulative plastic deformation increase with the increase of cyclic loading and loading times, but do not increase when cyclic times exceed 5 times. The classification total and plastic deformation and ratio of classified plastic deformation decrease with the increase of loading times, and the decreasing rate also decreases. But when cyclic loading exceeds 400 kPa, the classification total deformation and plastic deformation and ratio of classified plastic deformation are approximately equal. In the site rolling process, the use of high tonnage roller and 5 times combination rolling of light and weight equipment can effectively improve the compaction degree of soil rock mixture. Void ratio e has good correlation with compaction quality index K30(foundation coefficient) and Ev1(static deformation modulus), but little correlation with compaction quality index Evd(dynamic deformation module) and Ev2(static deformation modulus). K30 and Ev1 may be effective in evaluating indicators of compaction quality for soil-rock mixture.
Samples were obtained from the Daba tunnel of the Longyong highway in Hunan Province, and compaction simulating and comparative test of compaction quality indexes were carried out. The results show that the compression curves of soil rock mixture are overall convex type in plate loading test, and the rebound curves are smooth and slightly concave type. The(i+1)th compression-rebound curve is located below the ith curve, and has the similar linearity. The over-pressure curve has memory effect. The effect on wetting compaction deformation characteristics of soil-rock(limestone) mixture is not obvious. The deformation caused by the step loading is larger than that of the single loading. All of the cumulative total deformation and cumulative plastic deformation and ratio of accumulative plastic deformation increase with the increase of cyclic loading and loading times, but do not increase when cyclic times exceed 5 times. The classification total and plastic deformation and ratio of classified plastic deformation decrease with the increase of loading times, and the decreasing rate also decreases. But when cyclic loading exceeds 400 kPa, the classification total deformation and plastic deformation and ratio of classified plastic deformation are approximately equal. In the site rolling process, the use of high tonnage roller and 5 times combination rolling of light and weight equipment can effectively improve the compaction degree of soil rock mixture. Void ratio e has good correlation with compaction quality index K30(foundation coefficient) and Ev1(static deformation modulus), but little correlation with compaction quality index Evd(dynamic deformation module) and Ev2(static deformation modulus). K30 and Ev1 may be effective in evaluating indicators of compaction quality for soil-rock mixture.
引文
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[3]王仲锦,张千里,叶阳升.铁路路基填料分类化研究[J].中国铁道科学,2012,33(2):13-20.WANG Zhongjin,ZHANG Qianli,YE Yangsheng.In-depth study on the classification of filling for railway subgrade[J].China Railway Science,2012,33(2):13-20.
[4]张延杰,王旭,尹亚雄,等.水泥改良千枚岩弃渣用作铁路路基填料的试验研究[J].铁道学报,2014,36(6):81-86.ZHANG Yanjie,WANG Xu,YIN Yaxiong,et al.Experimental study on railway subgrade filling material of phyllite spoil improved with cement[J].Journal of the China Railway Society,2014,36(6):81-86.
[5]张献民,吕耀志,董倩,等.基于弹性波理论的土石混填路基压实质量评价研究[J].岩土工程学报,2015,37(11):2051-2057.ZHANG Xianmin,LüYaozhi,DONG Qian,et al.Evaluating compaction quality of soil-rock mixture based on theory of elastic waves[J].Chinese Journal of Geotechnical Engineering,2015,37(11):2051-2057.
[6]杨有海,黄大维,赖国泉,等.高速铁路路基戈壁填料地基系数与变形模量分析[J].岩土力学,2011,32(7):2051-2056.YANG Youhai,HUANG Dawei,LAI Guoquan,et al.Analysis of ground coefficient and modulus of deformation of gobi area filler in high-speed railway subgrade[J].Rock and Soil Mechanics,2011,32(7):2051-2056.
[7]曹文贵,伍丹,赵明华,等.基于静力贯入的土石混填路基压实度确定方法[J].中国公路学报,2010,23(5):8-15.CAO Wengui,WU Dan,ZHAO Minghua,et al.Determination method for compactness of soil-rock mixture subgrade based on static penetration[J].China Journal of Highway and Transport,2010,23(5):8-15.
[8]曹文贵,罗宏,张竣淞,等.基于Duncan-Chang模型的静力贯入路基压实度的确定方法[J].中国公路学报,2013,26(5):1-8.CAO Wengui,LUO Hong,ZHANG Junsong,et al.Determination method for subgrade compactness with static penetration based on Dunchan-Chang Constitutive Mode[J].China Journal of Highway and Transport,2013,26(5):1-8.
[9]梁承祥,尹建军.垄茶高速公路土石混填路基沉降特性分析[J].公路工程,2014,39(5):270-273.LIANG Chengxiang,YIN Jianjun.Study of settlement characteristics of stone embankment in Long-Cha highway[J].Highway Engineering,2014,39(5):270-273.
[10]徐文杰,胡瑞林.循环荷载下土石混合体力学特性野外试验研究[J].工程地质学报,2008,16(1):63-69.XU Wenjie,HU Ruilin.Field horizontal push shear test for mechanical property of soil-rock mixture sunder cyclic loading[J].Journal of Engineering Geology,2008,16(1):63-69.
[11]刘丽萍,折学森.土石混合料压实特性试验研究[J].岩石力学与工程学报,2006,25(1):206-210.LIU Liping,SHE Xuesen.Study on compaction property of earth-rock mixture[J].Chinese Journal of Rock Mechanics and Engineering,2006,25(1):206-210.
[12]董云,柴贺军,杨慧丽.土石混填路基原位直剪与室内大型直剪试验比较[J].岩土工程学报,2005,27(2):235-238.DONG Yun,CHAI Hejun,YANG Huili.Comparison of shear test in site and lab large-scale shear test for rock-soil aggregate of roadbed[J].Chinese Journal of Geotechnical Engineering,2005,27(2):235-238.
[13]GB 50007-2011,建筑地基基础设计规范[S].GB 50007-2011,Code for design of building foundation[S].
[14]周德泉,肖宏宇,雷鸣,等.重复加卸载条件下全风化泥质砂岩累积变形与湿化规律试验研究[J].岩石力学与工程学报,2013,32(3):465-473.ZHOU Dequan,XIAO Hongyu,LEI Ming,et al.Experimental study of accumulative deformation and slaking law of completely decomposed argillaceous sandstone under repeated loading and unloading[J].Chinese Journal of Rock Mechanics and Engineering,2013,32(3):465-473.
[15]周德泉,谭焕杰,徐一鸣,等.循环荷载作用下花岗岩残积土累积变形与湿化特性试验研究[J].中南大学学报(自然科学版),2013,44(4):1657-1665.ZHOU Dequan,TAN Huanjie,XU Yiming,et al.Indoor experimental study for accumulative and wetting deformation of granite residual soil under cyclic loading[J].Journal of Central South University(Science and Technology),2013,44(4):1657-1665.