| 击实黏土单轴拉伸特性试验研究 |
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| 引用本文： | 张云,王惠敏,鄢丽芬.击实黏土单轴拉伸特性试验研究[J].岩土力学,2013,34(8):2151-2157. |
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| 作者姓名： | 张云 王惠敏 鄢丽芬 |
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| 作者单位： | 1.南京大学 地球科学与工程学院，南京 210093；2.山东正元建设工程有限责任公司，济南 250101 |
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| 摘 要： | 为研究土的拉伸特性，对击实黏土进行直接拉伸试验。试验表明，不同抗拉强度的击实黏土具有不同的拉伸应力-应变曲线型式，即应变软化型、应变硬化型和应变强化型；在试验涉及的干密度和含水率范围内，击实黏土的抗拉强度随干密度的增加而增加，随含水率的增加而减小，且具有较好的线性关系；拉伸速率对击实黏土的抗拉强度和应力-应变曲线的型式也有明显影响，对同一干密度和含水率的土样，低拉伸速率测得的抗拉强度往往较小，且应力-应变曲线为软化型，而较高的拉伸速率测得的抗拉强度较大，且应力-应变曲线为强化型。
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| 关 键 词： | 单轴直接拉伸试验 击实黏土 应力-应变曲线 抗拉强度 |
| 收稿时间： | 2012-06-22 |
Test research on tensile properties of compacted clay |
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| ZHANG Yun
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WANG Hui-min
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YAN Li-fen.Test research on tensile properties of compacted clay[J].Rock and Soil Mechanics,2013,34(8):2151-2157. |
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| Authors: | ZHANG Yun WANG Hui-min YAN Li-fen |
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| Institution: | 1 .School of Earth Sciences and Engineering, Nanjing University, Nanjing 210093, China; 2. Shangdong Zhengyuan Construction Engineering Co., Ltd., Jinan 250101, China |
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| Abstract: | In order to research the tensile properties of compacted clay, a conventional triaxial test apparatus was modified to a uniaxial tensile apparatus for clays, by which clay samples can be extended and the stress and corresponding strain of the samples can be measured directly. A series of laboratory tests were conducted to investigate the tensile properties of compacted clay. The tested clay samples have various moisture contents (from 16% to 24%) and various dry densities (from 1.29 g/cm3 to 1.65 g/cm3), which have impacts not only on the tensile strength of samples, but also on the pattern of tensile stress-strain curves. It is found that there are three patterns of stress-strain curves for the tension of clay soil, i. e. strain-softening, strain-hardening, and strain-strengthening, corresponding to the increasing tensile strength and failure strain. The tensile strength of compacted clay approximately increases with its dry density and decreases with its moisture content linearly. With the increasing dry density and decreasing moisture content, the pattern of stress-strain curves of the clay samples changes from strain-softening to strain-hardening, then to strain-strengthening pattern. The tensile rate has obvious effect on the measured tensile strength and the pattern of stress-strain curves. For the samples with identical dry density and moisture content, lower tensile rate results in smaller measured tensile strength and strain-softening stress-strain curves; and higher tensile rate causes greater measured tensile strength and strain-strengthening stress-strain curves. |
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| Keywords: | uniaxial direct tensile test compacted clay stress-strain curve tensile strength |
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