压实黏土单轴拉伸变形特性试验研究
发布时间：2018-12-15 02:55
【摘要】：为了研究土体的拉伸变形特性,进而更好地分析与解决土体由于拉伸破坏而引起的裂缝与地表塌陷等工程问题,本文以压实黏土为研究对象,基于自主研发的新型土工单轴拉伸试验装置开展了系统的试验研究,探讨了压实黏土的破坏形式与影响因素,以及峰值位移随试验变量的变化规律与拟合公式。研究结果表明:压实黏土单轴拉伸破坏形式不固定,包括拉伸断裂面形状不固定;断裂面为试样薄弱面,断裂面唯一,但薄弱面不一定唯一;断裂面的位置受试样尺寸与拉伸速率影响;拉伸破坏不是纯脆性破坏,而是存在软化阶段。另外,压实黏土的峰值位移受试验条件的影响明显,具体表现在:峰值位移随拉伸段长度的增加而增大,二者呈现出较好的对数关系;峰值位移随拉伸速率的增加而增大,二者呈现出较好的线性关系;峰值位移随压实度的增加而增大,二者表现出较好的线性关系;峰值位移随含水率的增加而增大,二者表现出较好的线性关系。
[Abstract]:In order to study the tensile deformation characteristics of soil and to better analyze and solve the engineering problems such as cracks and ground collapse caused by tensile failure, this paper takes compacted clay as the research object. Based on a new type of geotechnical uniaxial tensile test device developed by ourselves, a systematic experimental study was carried out. The failure mode and influencing factors of compacted clay were discussed, as well as the variation law and fitting formula of peak displacement with test variables. The results show that the uniaxial tensile failure of compacted clay is not fixed, including the shape of tensile fracture surface is not fixed, the fracture surface is the weak surface of the specimen, the fracture surface is unique, but the weak surface is not necessarily unique. The location of the fracture surface is affected by the specimen size and tensile rate, and the tensile failure is not a pure brittle failure, but a softening stage. In addition, the peak displacement of compacted clay is obviously affected by the test conditions. The results show that the peak displacement increases with the increase of the length of the tensile section, which shows a good logarithmic relationship; The peak displacement increases with the increase of tensile rate, and the peak displacement increases with the increase of compaction. The peak displacement increases with the increase of moisture content, which shows a good linear relationship.
【作者单位】： 南昌工程学院土木与建筑工程学院;江西省公路科研设计院;河海大学岩土工程研究所;
【基金】：国家自然科学基金(51609114) 岩土力学与堤坝工程教育部重点实验室开放基金(2016001)资助
【分类号】：TU442
[Abstract]:In order to study the tensile deformation characteristics of soil and to better analyze and solve the engineering problems such as cracks and ground collapse caused by tensile failure, this paper takes compacted clay as the research object. Based on a new type of geotechnical uniaxial tensile test device developed by ourselves, a systematic experimental study was carried out. The failure mode and influencing factors of compacted clay were discussed, as well as the variation law and fitting formula of peak displacement with test variables. The results show that the uniaxial tensile failure of compacted clay is not fixed, including the shape of tensile fracture surface is not fixed, the fracture surface is the weak surface of the specimen, the fracture surface is unique, but the weak surface is not necessarily unique. The location of the fracture surface is affected by the specimen size and tensile rate, and the tensile failure is not a pure brittle failure, but a softening stage. In addition, the peak displacement of compacted clay is obviously affected by the test conditions. The results show that the peak displacement increases with the increase of the length of the tensile section, which shows a good logarithmic relationship; The peak displacement increases with the increase of tensile rate, and the peak displacement increases with the increase of compaction. The peak displacement increases with the increase of moisture content, which shows a good linear relationship.
【作者单位】： 南昌工程学院土木与建筑工程学院;江西省公路科研设计院;河海大学岩土工程研究所;
【基金】：国家自然科学基金(51609114) 岩土力学与堤坝工程教育部重点实验室开放基金(2016001)资助
【分类号】：TU442
【相似文献】
相关期刊论文 前10条
1 邓爱民,徐道远,符晓陵,朱为玄,王向东;混凝土单轴拉伸损伤试验研究[J];合肥工业大学学报(自然科学版);2003年01期
2 杨吴生;薛明霞;;混凝土单轴拉伸应力-应变全曲线试验方法及装置[J];工业建筑;2009年S1期
3 陈健云;白卫峰;;考虑动态应变率效应的混凝土单轴拉伸统计损伤模型[J];岩石力学与工程学报;2007年08期
4 邓宗才;薛会青;李朋远;张鹏飞;佘向军;;高韧性纤维增强水泥基复合材料的单轴拉伸力学性能[J];北京工业大学学报;2009年09期
5 周寒清;彭刚;陈伟;吴彬;;混凝土细观尺度下单轴拉伸性能研究[J];人民黄河;2013年04期
6 梁宁慧;刘新荣;孙霁;;多尺度聚丙烯纤维混凝土单轴拉伸试验[J];重庆大学学报;2012年06期
7 蔡向荣;徐世p，
本文编号：2379835
本文链接：https://www.wllwen.com/jianzhugongchenglunwen/2379835.html
