土工合成材料流变参数合理选择的研究

包承纲; 童军; 丁金华

doi:10.11779/CJGE201503003

土工合成材料流变参数合理选择的研究 English Version

长江科学院水利部岩土力学与工程重点实验室,湖北武汉 430010

基金项目: 中央级公益性科研院所基本科研业务费资助项目（CKSF2014060/YT））

详细信息

作者简介:
包承纲(1935- ),男,教授级高级工程师,主要从事岩土工程、水利工程等研究。E-mail: cgbao35@sina.com。

中图分类号: TU43
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出版历程
- 收稿日期: 2014-06-02
- 发布日期: 2015-03-23

Reasonable selection of rheological parameters of geosynthetics

Yangtze River Scientific Research Institute, Key Laboratory of Geotechnical Mechanics and Engineering of the Ministry of Water Resources, Wuhan 430010, China

摘要

摘要: 工程中应用土工合成材料时必需考虑其流变特性的影响,流变特性一般指蠕变、松弛、长期强度等方面的性质。当前在土工合成材料设计强度值的选择中,为考虑蠕变影响,往往对其极限强度乘一个蠕变折减系数后加以使用。这个系数如何取值对工程的安全性和经济性影响很大。由于对该系数研究不够,国际和国内都存在很大分歧,一般都取得十分保守。土工合成材料蠕变试验成果表明,蠕变的影响与作用的荷载水平关系很大,当荷载水平小于某一临界值时,材料的变形将渐趋稳定,不会导致蠕变破坏。而根据国内外大量工程实测资料表明,加筋土结构中筋材所受的力很小,仅及设计预测值的几分之一,甚至只有5%,变形也远低于预测值,筋材最大的受力和变形发生在施工结束时。同时,实测资料表明,土体中筋材存在松弛现象,它将减轻蠕变的影响。根据有关的机理分析、试验数据和实测资料,对筋材强度折减系数的合理取值提出了建议。
- 土工合成材料 /
- 加筋土 /
- 流变特性 /
- 蠕变折减系数 /
- 松弛特性
Abstract: The influence of rheological properties of geosynthetics in engineering should be considered properly. For this purpose, a creep reduction factor is considered in the design tensile strength. However, the selected value of this factor is too conservative in the current time. Based on the test results, the stress level applied on geosynthetic materials is the critical factor for the influence of creep on rupture. Whereas, according to the monitoring data from international and domestic reinforced structures, the stress level for geosynthetics reinforcement is mostly quite low, and it is only several percent of the design tensile strength. The largest values of stress and deformation in reinforcement appear at the end of construction time. Moreover, some creep tests are performed under the condition without any lateral pressure on test specimen, and the influence of creep will be enlarged. Otherwise, the relaxation property should be concerned for reinforced structures, and it will reduce the influence of creep. Finally, the reasonable value of creep reduction factor is suggested.
- geosynthetics /
- reinforced soil /
- rheological property /
- creep reduction factor /
- relaxation property

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