An improved simple shear apparatus for GCL internal and interface stress-displacement measurements

An improved simple shear apparatus for GCL internal and interface stress-displacement measurements
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一种改进的简单剪切装置,用于 GCL 内部和界面应力-位移测量

DOI:
10.1007/s12665-013-2810-4
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发表时间:
2014-04
期刊:
Environ Earth Sci
影响因子:
--
通讯作者:
Xuede Qian
Xuede Qian
中科院分区:
其他
文献类型:
--
作者:
Hai Lin;Jianyong Shi;Xuede Qian

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土工合成粘土衬垫(GCL)已被广泛用作垃圾填埋场的水力屏障,沿着HDPE土工膜(GM)。GCL的内部强度和界面强度是评价填埋场稳定性的重要指标。本研究所使用的改良式单剪仪,并不强迫剪切破坏发生在沿着一预定平面。复合材料试件可沿沿着任何界面或通过GCL内部的剪切而失效。在测试过程中还可以测量样本每个部件的位移。当无纺土工织物侧接触纹理GM(NWGT/GMX)和编织土工织物侧接触压实粘土层(WGT/CCL)时,随着法向应力的增加,GCL的破坏界面由NWGT/GMX界面向WGT/CCL界面转变。相反,当编织土工织物侧接触纹理GM(WGT/GMX)和无纺土工织物侧接触压实粘土层(NWGT/CCL)的干GCL,故障总是发生在WGT/GMX接口的所有施加的法向应力。在干燥条件下,当法向应力增加到1,500 kPa时,GCL没有发生内部破坏。
Geosynthetic clay liners (GCLs) have been widely used as a hydraulic barrier along with HDPE geomembrane (GM) in landfills. Both the internal and interface strengths of GCLs are very important for evaluating landfill stability. An improved simple shear apparatus used in this study does not force the shear failure to occur along a pre-determined plane. The composite specimens can fail along any interface or through shearing of the GCL internally. The displacement of each component of the specimen can also be measured during the tests. When non-woven geotextile side contacts textured GM (NWGT/GMX) and woven geotextile side contacts compacted clay layer (WGT/CCL) for a dry GCL, the failure interface can change from NWGT/GMX interface to WGT/CCL interface with the increases of the normal stresses. Conversely, when woven geotextile side contacts textured GM (WGT/GMX) and non-woven geotextile side contacts compacted clay layer (NWGT/CCL) for a dry GCL, the failure always occurs at the WGT/GMX interface for all applied normal stresses. The internal failure of the GCL did not occur when the normal stress increased up to 1,500 kPa for the GCL in dry condition.
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