Experimental Study on Effect of Temperature on Geo-Mechanical Properties of Geomembrane
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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.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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Key words:
- geomembrane /
- temperature /
- tensile strength /
- interface shear strength /
- geosynthetics /
- geotechnical engineering
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图 4 GM剪切试验及固定方式示意
a.GM/砂土界面剪切试验; b.土工布的固定方式; c.土工膜试样的固定方式
Fig. 4. Schematic diagrams of GM shear test and fixing method
图 5 GM/GT界面剪切重复试验
Fig. 5. Repeated shear results for the GM/GT interface
T=60 ℃, σn=400 kPa
图 6 不同温度下GMX、GMS拉伸应力应变曲线
a.不同温度下GMX的拉伸应力应变曲线；b.不同温度下GMS的拉伸应力应变曲线
Fig. 6. GMX and GMS tensile stress-strain curves at different temperatures
图 7 GMS抗拉强度和弹性模量的温度效应
Fig. 7. Temperature effect graph of GMS tensile strength and elastic modulus
图 8 不同温度下GMS/砂土界面应力位移曲线
Fig. 8. GMS/sand interface stress-displacement curves at different temperatures
a.σn =25 kPa; b.σn =50 kPa; c.σn =100 kPa; d.σn =200 kPa; e.σn =400 kPa
图 9 不同温度下GMS/砂土界面强度包线
Fig. 9. GMS/sand interface strength envelope at different temperatures
图 10 不同法向压力下GMX/砂土界面应力位移曲线
Fig. 10. GMX/sand interface stress-displacement curves at different temperatures
a.σn =25 kPa; b.σn =50 kPa; c.σn =100 kPa; d.σn =200 kPa; e.σn =400 kPa
图 11 不同温度下GMX/砂土界面强度包线
Fig. 11. GMX/sand interface strength envelope at different temperatures
图 12 不同法向应力下GMS/GT界面应力位移曲线
Fig. 12. GMS/GT interface stress-displacement curves at different temperatures
a.σn =25 kPa; b.σn =50 kPa; c.σn =100 kPa; d.σn =200 kPa; e.σn =400 kPa
图 13 不同温度下GMS/GT界面强度包线
Fig. 13. GMS/GT interface strength envelope at different temperatures
图 14 GM/砂土界面和GMS/GT界面剪切摩擦角的温度效应
Fig. 14. The temperature effect of the shear friction angle of the GM/sand interface and GMS/GT interface
表 1 土工合成材料的岩土参数
Table 1. The geotechnical parameters of geosynthetics
试验材料 厚度(mm) 密度(g•cm-3) 断裂强度(N/mm) 断裂伸长率(%) 穿刺强度(N) 撕裂强度(N) 光面土工膜(GMS) 2 0.94 54 718 640 251 糙面土工膜(GMX) 1.5 0.94 26 400 534 268 厚度(mm) 单位面积质量(g/m²) 拉伸强度(kN/m) 伸长率(%) 撕裂强度(kN) 刺破强度(kN) 无纺土工布(GT) 5.5 300 40 75 1.1 7.9 
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表 2 不同温度下GM/砂土、GMS/GT界面强度指标
Table 2. GM/sand, GMS/GT interface strength index at different temperatures
界面 摩擦角 20 ℃ 30 ℃ 40 ℃ 50 ℃ 60 ℃ GMS/砂土 φ (°) 23.80 23.90 24.44 23.95 24.39 R2 0.996 5 0.997 5 0.995 1 0.996 3 0.995 1 GMX/砂土 φ (°) 31.38 31.70 31.19 32.38 32.49 R2 0.996 5 0.995 7 0.995 6 0.992 0 0.999 0 GMS/GT φ (°) 9.58 9.96 10.10 11.01 10.02 R2 0.997 9 0.997 5 0.998 6 0.984 1 0.998 4
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