土工膜/GCL界面多级加荷剪切性能的试验研究

doi:10.3969/j.issn.1001-5485.2015.08.011

院报 ›› 2015, Vol. 32 ›› Issue (8): 61-64.DOI: 10.3969/j.issn.1001-5485.2015.08.011

土工膜/GCL界面多级加荷剪切性能的试验研究

徐天杰^1a,刘斌云^1a,1b,李维朝²,蔡红²

1.北京工业大学 a.建筑工程学院;
b.北京市水质科学与水环境恢复工程重点实验室,北京 100124;
2. 中国水利水电科学研究院岩土工程研究所,北京 100037

收稿日期:2014-03-12 出版日期:2015-08-20 发布日期:2015-08-18
作者简介:徐天杰(1988-),男,河南周口人,硕士研究生,主要从事地下防渗材料方面的研究,(电话)15138913103(电子信箱)chinaxtj@sina.com。

Shear Properties of GM/GCL Interface under Multilevel Loading

XU Tian-jie¹,LIU Bin-yun^1,2,LI Wei-chao³,CAI Hong³

1.College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124,China;
2.Beijing Key Lab of Water Quality Science and Water Environmental Restoration, Beijing University of Technology, Beijing 100124,China;
3.Department of Geotechnical Engineering,China Institute of Water Resources and Hydropower,Beijing 100037,China

Received:2014-03-12 Online:2015-08-20 Published:2015-08-18

摘要/Abstract

摘要： 土工膜作为一种防渗材料已广泛应用于工程和环保领域,但在施工铺设过程中的损伤会降低其抗剪强度。利用大型直剪仪进行土工膜(GM)与膨润土防水毯(GCL)界面多级加荷剪切与直接剪切试验,探究加载对土工膜抗剪强度的影响。试验结果表明多级加荷剪切峰值强度较小于直接剪切峰值强度,2种剪切方式界面均表现出明显的应变软化特性;正应力为7.1~52.1 kPa时,多级加荷剪切峰值强度和残余强度分别与直接剪切峰值强度和残余强度均较为接近;大正应力下的重复剪切对土工膜损伤有较大影响,当正应力大于102.1 kPa,多级加荷剪切峰值摩擦角降低了7.05°,残余摩擦角降低了3.09°。

关键词: 土工膜, GCL, 多级加荷, 剪切强度, 应变软化

Abstract: As an impermeable material, geomembrane (GM) has been widely used in engineering and environmental fields, but the damage during construction will reduce its shear strength. In view of this we conducted multilevel loading and direct shear tests on GM/GCL (geosynthetic clay liner) interfaces using a large size direct shear apparatus. Results show that the peak shear strength under multilevel loading is much lower than that under direct shear, and obvious strain softening of the interface occurs under both shear modes; the peak shear strength and residual strength under multilevel loading are close to those under direct shear when the normal stress is from 7.1 to 52.1kPa; repeated shearing under large normal stress has great damage on geomembrane which leads to a loss of 7.05 ° in terms of peak friction angle and 3.09 ° in terms of residual friction angle when the normal stress is greater than 102.1kPa under multilevel loading.

Key words: geomembrane, GCL, multilevel loading, shear strength, strain softening

中图分类号:

TU411

徐天杰,刘斌云,李维朝,蔡红. 土工膜/GCL界面多级加荷剪切性能的试验研究[J]. 院报, 2015, 32(8): 61-64.

XU Tian-jie,LIU Bin-yun,LI Wei-chao,CAI Hong. Shear Properties of GM/GCL Interface under Multilevel Loading[J]. JOURNAL OF YANGTZE RIVER SCIENTIFIC RESEARCH INSTI, 2015, 32(8): 61-64.

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土工膜/GCL界面多级加荷剪切性能的试验研究

Shear Properties of GM/GCL Interface under Multilevel Loading

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