反包式土工织物治理覆盖型岩溶路基塌陷的模型试验研究

Model Test on the Treatment of Covered Karst Subgrade Collapse by Wrapping-Back Geotextile

摘要: 结合岩溶路基塌陷工程实例，设计了室内缩尺模型试验，建立四种不同工况，从土压力分布及塌陷区上方填土位移两个方面，研究了土工织物自由端采用反包与不反包方式时对岩溶路基塌陷治理的影响。模型试验结果表明，相比不加筋，采用土工织物治理岩溶路基塌陷能有效减小塌陷沉降，增强路基稳定性，具有良好的效果；基于本次模型试验，相比不反包，采用反包方式能够更好的将土工织物锚固在填土中，提高土工织物的锚固力，减小治理铺设范围。

Abstract: Combined with the karst subgrade collapse engineering example, the indoor scale model test was designed, and four different working conditions were established. From the two aspects of the earth pressure distribution and the displacement of the fill above the subsidence area, the use of turn-up and non-turn-up of the free end of the geotextile was studied. The model test results show that, compared with no reinforcement, the use of geotextiles to treat the karst subgrade subsidence can effectively reduce the subsidence and settlement, enhance the stability of the subgrade, and has a good effect; based on this model test, compared with no reverse wrapping, using reverse wrapping method can better anchor geotextile in the fill, improve the anchoring force of geotextile, and reduce the treatment laying range.