土工合成材料对路堤长期稳定性及工后沉降的负面影响分析

Analysis of negative effect of geotextile on long-term stability and post-construction settlement of embankment

从土工合成材料作用机理着手,分析了在高速公路软基处理中使用土工合成材料会对路堤长期稳定性及工后沉降产生负面影响。土工合成材料的长期强度损失及模量的降低会降低路堤的长期稳定性。土工合成材料的长期变形和松弛对工后沉降也会产生一定的不利影响。某高速公路试验段实测资料表明,一层土工布对工后沉降的影响可忽略不计,两层土工布约增加工后沉降40～50mm。

Based on the discussion of the nature and work condition of geotextile, its negative effect on long-term stability and post-construction settlement in soft ground improvement of highway was analyzed. The stability might decrease due to its loss of long-term strength and reduction of modulus. The geotextile could also induce some harmful effect to the post-construction settlement due to its long-term deflection and relaxation. The results of test section in a highway show that the post-construction settlement increased by one layer of fabric can be ignored but the post-construction settlement increased by two layers of fabric may reach 40~50 mm.