干湿循环作用下夹泥碎石土路基填料力学特性研究
|
摘要
为了更好地指导碎石土填筑路基,通过室内试验研究了干湿循环作用下含石量50%、含泥量3%的夹泥碎石土的力学特性及碎石土抗剪强度影响因素.结果表明:碎石土的抗剪强度随含石量、含泥量、含水率及最大干密度的变化而变化;干湿循环作用下,碎石土的力学特性指标发生明显变化,在干湿循环5次时黏聚力、内摩擦角、压缩模量明显减少,而沉降变形量、压缩系数明显增大;干湿循环次数超过5次后,其力学特性指标趋于定值,碎石土变形逐步稳定.
In order to better guide the roadbed filled with gravel soil,the mechanical properties of gravel soil with 50% stone content and 3% mud content under the dry-wet cycle and the influencing factors of the shear strength of gravel soil was studied in this paper. It is found that the shear strength of gravel soil varies with the content of stone,mud content,water content and maximum dry density. Under the action of dry and wet cycles,the mechanical properties of gravel soil change significantly,among which when the wet cycle is 5 times,the cohesive force,the internal friction angle and the compression modulus are reduced clearly,the settlement deformation,the compression coefficient are increased clearly; and the number of dry and wet cycles is exceeded After5 times of the said cycle,the mechanical properties of the cement tend to be fixed,indicating that the deformation of the gravel soil is gradually stable.
In order to better guide the roadbed filled with gravel soil,the mechanical properties of gravel soil with 50% stone content and 3% mud content under the dry-wet cycle and the influencing factors of the shear strength of gravel soil was studied in this paper. It is found that the shear strength of gravel soil varies with the content of stone,mud content,water content and maximum dry density. Under the action of dry and wet cycles,the mechanical properties of gravel soil change significantly,among which when the wet cycle is 5 times,the cohesive force,the internal friction angle and the compression modulus are reduced clearly,the settlement deformation,the compression coefficient are increased clearly; and the number of dry and wet cycles is exceeded After5 times of the said cycle,the mechanical properties of the cement tend to be fixed,indicating that the deformation of the gravel soil is gradually stable.
引文
[1] Maranha das Neves E. Advances in rock fill structure[M]. Netherlands:Kluwer Academic Publishers,1991:221-236.
[2]张海洋.土石混合体细观结构力学及尺度效应研究[D].北京:清华大学,2016.
[3]孙雅珍,郭睿,马作鑫,等.含水率对稳定碎石土力学特性影响的试验研究[J].北方交通,2018(6):74-77.
[4]周志军,南浩林,张熠.土石混合料路用工程力学性质试验[J].长安大学学报:自然科学版,2007(5):11-15.
[5]杨越.降雨条件下边坡土石混合体的渗透和力学性能试验研究[D].株洲:湖南工业大学,2012.
[6]马东豪,邵明安.含碎石土壤的含水量测定误差分析[J].土壤学报,2008(2):201-206.
[9]蒋鹏.含石量对土石混合料剪切特性的影响[J].工程与建设,2016,30(4):442-444.
[7]徐文杰,胡瑞林,岳中琦,等.土石混合体细观结构及力学特性数值模拟研究[J].岩石力学与工程学报,2007(2):300-311.
[8]杨洪东,陈志勇.土夹石混合料回填技术应用探讨[J].工程建设与设计,2006(5):85-87.
[9]蒋鹏.含石量对土石混合料剪切特性的影响[J].工程与建设,2016,30(4):442-444.
[10]罗宏.土石混填路基压实度测试技术及其工程应用[D].长沙:湖南大学,2016.
[2]张海洋.土石混合体细观结构力学及尺度效应研究[D].北京:清华大学,2016.
[3]孙雅珍,郭睿,马作鑫,等.含水率对稳定碎石土力学特性影响的试验研究[J].北方交通,2018(6):74-77.
[4]周志军,南浩林,张熠.土石混合料路用工程力学性质试验[J].长安大学学报:自然科学版,2007(5):11-15.
[5]杨越.降雨条件下边坡土石混合体的渗透和力学性能试验研究[D].株洲:湖南工业大学,2012.
[6]马东豪,邵明安.含碎石土壤的含水量测定误差分析[J].土壤学报,2008(2):201-206.
[9]蒋鹏.含石量对土石混合料剪切特性的影响[J].工程与建设,2016,30(4):442-444.
[7]徐文杰,胡瑞林,岳中琦,等.土石混合体细观结构及力学特性数值模拟研究[J].岩石力学与工程学报,2007(2):300-311.
[8]杨洪东,陈志勇.土夹石混合料回填技术应用探讨[J].工程建设与设计,2006(5):85-87.
[9]蒋鹏.含石量对土石混合料剪切特性的影响[J].工程与建设,2016,30(4):442-444.
[10]罗宏.土石混填路基压实度测试技术及其工程应用[D].长沙:湖南大学,2016.