| 土工膜岩土力学性质的温度影响试验 |
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| 引用本文： | 林海,陈薪文,曾一帆.土工膜岩土力学性质的温度影响试验[J].地球科学,2022,47(6):2165-2174. |
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| 作者姓名： | 林海 陈薪文 曾一帆 |
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| 作者单位： | 1.南昌大学工程建筑学院, 江西南昌 330031 |
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| 基金项目： | 国家自然科学基金(Nos.41702324,42062018)； |
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| 摘 要： | HDPE土工膜（geomembrane，GM）在城市卫生填埋场等环保工程中可能会面临高温环境，现有关于GM力学性能的试验研究大都在常温下进行，土工膜力学性质的温度效应关乎到边坡稳定和工程安全.为了揭露土工膜岩土力学性质的温度影响规律，开展了GM温控拉伸试验以及不同温度条件下的GM/砂土界面直剪试验和GM/无纺土工布（geotextile，GT）界面直剪试验.通过对比分析不同温度条件下GM的拉伸性质和GM界面剪切特性，揭露温度环境对土工膜岩土力学性质的定性及定量影响规律.试验结果表明，GM的抗拉强度随温度变化影响显著，相对于常温情况，大于70 ℃的高温可使GM的抗拉强度折减近80%；温度对GM/GT界面剪切特性的影响要明显大于GM/砂土界面，GM岩土力学性质的温度效应引起工程人员的重视.
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| 关 键 词： | 土工膜 温度 拉伸强度 界面剪切强度 土工合成材料 岩土工程 |
| 收稿时间： | 2021-04-14 |
Experimental Study on Effect of Temperature on Geo-Mechanical Properties of Geomembrane |
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| Abstract: | HDPE geomembrane (GM) may be in high temperature condition in environmental protection projects such as urban sanitary landfill. Most of the existing experimental studies on the mechanical properties of GM were carried out at normal temperature, the temperature effect of the mechanical properties of GM relates to in-site slope stability and engineering safety. The temperature-controlled tensile tests of GM, interface shear tests of GM/sand interface and GM / non-woven geotextile (GT) interface under different temperature conditions were carried out to reveal the influence of temperature on the geo-mechanical properties of GM. Qualitative and quantitative effects of temperature on the geo-mechanical properties are revealed through comparative analysis of the tensile properties of GM and the shear properties of GM interface under different temperature conditions. The test results show that the tensile strength of GM changes significantly with temperature, and the tensile strength obtained at high temperature (above 70 ℃) can be reduced by nearly 80% compared with the normal temperature situation. The effect of temperature on the shear properties of GM/GT interface is obviously greater than that of GM/sand interface, and the temperature effect of GM geo-mechanical properties deserve more attention of engineers. |
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