The effect of installation damage on the long-term design strength of a reinforcing geosynthetic
The effect of installation damage on the long-term design strength of a reinforcing geosynthetic
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DOI：
10.1680/gein.9.0217
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发表时间：
2002-01-01
影响因子：
4.5
通讯作者：
Greenwood, JH
中科院分区：
文献类型：
--
作者：
Greenwood, JH
在加筋土的设计中，目前的做法是通过乘以两个分项安全系数RFID和RFCR来计算在安装过程中损坏的钢筋的长期强度。这一程序假定它们之间没有协同作用。为了验证这一假设，在聚酯土工合成材料的未损坏和损坏状态下进行了步进等温蠕变断裂试验。所选的土工合成材料和损坏方法经过专门选择，使强度降低30%，分散度最小。从简单的拉伸测试中，安装损坏的减少因子RFID测得为1.42。对未受损土工合成材料进行的逐步等温法试验得出蠕变断裂特性，RFCR = 1.70，持续106小时（114年）。因此，受损土工合成材料长期强度的预测折减系数为（RFCR）（RFID）= 2.41。测量的降低因子为2.26，比预测值低7%。建议使用（RFCR）（RFID）的做法是坚持在知识的预测将略有保守。
Current practice in the design of reinforced soil is to calculate the long-term strength of a reinforcement damaged during installation by multiplying the two partial safety factors RFID and RFCR. This procedure assumes that there is no synergy between them. To test this hypothesis, stepped isothermal method creep-rupture tests were performed on a polyester geosynthetic in its undamaged and damaged states. The geosynthetic chosen and the method of damage were specifically chosen to yield a 30% reduction in strength with the minimum of scatter. From simple tensile testing, the reduction factor for installation damage, RFID, was measured to be 1.42. Stepped isothermal method tests on the undamaged geosynthetic gave a creep-rupture characteristic with RFCR = 1.70 for 106 hours (114 years). Thus, the predicted reduction factor for the long-term strength of the damaged geosynthetic is (RFCR)(RFID) = 2.41. The measured reduction factor was 2.26, 7% less than predicted. It is recommended that the practice of using (RFCR)(RFID) is upheld in the knowledge that the prediction will be slightly conservative.