循环荷载作用下水泥改良黄土路基的变形特性
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摘要
对水泥改良黄土及重塑黄土在循环荷载作用下进行动三轴试验,研究围压、频率、振动次数、动荷载大小等因素对土样变形特性的影响。试验结果表明:与重塑黄土相比,水泥改良黄土的弹性变形和累积塑性变形较小,并随振动次数的增加而趋于平稳;在相同深度处,随着水泥掺量的增加,改良黄土的弹性变形及累积塑性变形逐渐减小;当埋深较浅时,水泥掺量是路基变形的主要影响因素,而当埋深较深时,埋深深度是路基变形的主要影响因素;得到不同水泥掺量的改良黄土路基累积塑性变形计算公式,为铁路路基的设计和动力稳定性评价提供依据。
The dynamic triaxial tests of cement-developed loess and remolded loess were carried out under the cyclic loading,and the influence of such factors as confining pressure,frequency,v ibration times and dynamic load on the deformation characteristics of soil samples was studied. The test results show that the elastic deformation and cumulative plastic deformation of the cement-developed loess is small and tends to be stable with the vibration frequency increasing compared with the remolded loess,the elastic deformation and cumulative plastic deformation of the improved loess decreases gradually with the increase of cement content at the same depth.The cement content is the main factor affecting the subgrade deformation when the buried depth is shallow and the buried depth is the main factor affecting the subgradedeformation when the buried depthis deep.The calculation formula for cumulative plastic deformation of improved loess subgrade with different cement contents is concluded,which could provide the basis for the design and dynamic stability evaluation of railway subgrade.
The dynamic triaxial tests of cement-developed loess and remolded loess were carried out under the cyclic loading,and the influence of such factors as confining pressure,frequency,v ibration times and dynamic load on the deformation characteristics of soil samples was studied. The test results show that the elastic deformation and cumulative plastic deformation of the cement-developed loess is small and tends to be stable with the vibration frequency increasing compared with the remolded loess,the elastic deformation and cumulative plastic deformation of the improved loess decreases gradually with the increase of cement content at the same depth.The cement content is the main factor affecting the subgrade deformation when the buried depth is shallow and the buried depth is the main factor affecting the subgradedeformation when the buried depthis deep.The calculation formula for cumulative plastic deformation of improved loess subgrade with different cement contents is concluded,which could provide the basis for the design and dynamic stability evaluation of railway subgrade.
引文
[1]何小亮,刘潇敏,王志硕.水泥改良黄土动力特性的动三轴试验研究[J].地下水,2014,36(2):193-196.
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[2]刘大鹏,杨晓华,王永威.风积沙在循环荷载作用下的变形特性试验研究[J].武汉理工大学学报,2014,36(6):103-108.
[3]王谦,钟秀梅,苏永奇.动荷载作用下兰州地铁黄土的动力变形特性研究[J].现代隧道技术,2016(6):137-143.
[4]张勇,孔令伟,郭爱国,等.循环荷载下饱和软黏土的累积塑性应变试验研究[J].岩土力学,2009,30(6):1542-1548.
[5]MOHAMED A M O.The Role of Clay Minerals in Marly Soils on Its Stability[J].Engineering Geology,2000,57(57):193-203.
[6]CHEN Fuhua.Foundations on Expansive Soils[J].Developments in Geotechnical Engineering,1988,125(3):29-30.
[7]房立凤.郑西客运专线水泥改良黄土路基填料试验研究[D].成都:西南交通大学,2009.
[8]马学宁,梁波.水泥改良黄土力学特性试验研究[J].岩土工程技术,2005,19(5):241-244.
[9]苏毅.高速铁路路基黄土填料改良后的工程特性研究[J].铁道建筑,2017,57(7):100-103.
[10]马学宁,梁波,黄志军,等.高速客运专线路基改良填料的试验研究[J].铁道学报,2005,27(5):96-101.
[11]李星,程谦恭,张金存,等.干湿循环下高铁路基水泥改良膨胀土动力特性试验研究[J].铁道建筑,2016,56(6):99-103.
[12]王家鼎,彭淑君,马闫,等.高速列车振动荷载下水泥改良黄土动力学试验[J].地震工程学报,2013,35(1):35-41.
[13]郭大进,王旭东.水泥土动态模量试验的分析[J].公路交通科技,2000,17(5):18-20.
[14]中华人民共和国铁道部.TB 10621—2014高速铁路设计规范[S].北京:中国铁道出版社,2014.