加筋垫层治理路基塌陷的对称半断面模型试验研究  

Model test study on the symmetrical semi-section for treating subgrade collapse with reinforced cushion

作　　者：吴迪 陈庆书 龚垒旭 吴建建 李丹 WU Di;CHEN Qingshu;GONG Leixu;WU Jianjian;LI Dan(School of Architecture and Transportation Engineering,Guilin University of Electronic Technology,Guilin 541004,Guangxi,China)

机构地区：[1]桂林电子科技大学建筑与交通工程学院,广西桂林541004

出　　处：《地基处理》2024年第6期572-579,共8页Journal of Ground Improvement

基　　金：国家自然科学基金(42067044);广西重点研发计划项目(桂科AB23026028)。

摘　　要：在回填压实过程中加铺具有加筋、反滤性能的土工织物的治理方法能有效解决工况复杂、工期紧张的城市道路塌陷治理问题,且不易复塌。为进一步探明该治理方法适用的道路塌陷工况,尤其是塌陷宽度的适用范围,设置了5组对称半断面和1组全断面室内大比例模型试验,对土工织物治理岩溶路基塌陷时土压力、位移场和织物应力分布等进行研究。试验结果表明:对称半断面模型试验结果与全断面模型具有一致性,数据有效;塌陷宽度是影响土工织物治理效果的重要因素,随着塌陷宽度的增加,塌陷边缘处稳定区最大竖向应力、加筋体最大拉力以及填土竖向位移均显著增大,应根据该位置受力选择抗拉强度适宜的土工织物;在塌陷宽度为2.0 m时,采用L≥1.5B的土工织物治理路基塌陷的效果良好,土工织物加筋垫层不宜应用于治理B≥2.0 m的大型路基塌陷,揭示了土工织物治理路基塌陷方法的适用范围。The treatment method of adding reinforced and anti filtering geotextiles during the backfilling and compaction process can effectively solve the problem of urban road collapse with complex working conditions and tight construction schedules,and it is not easy to collapse again.In order to further explore the applicable road collapse conditions of this treatment method,especially the applicable range of collapse width,five sets of symmetrical semi-section and one set of full-section large scale indoor model tests were set up to study the soil pressure,displacement field,and fabric stress distribution during the treatment of karst subgrade collapse with geotextiles.The test results show that the outcomes of the symmetrical semi-section model are consistent with the full-section model,and the data are effective.The collapse width is an important factor affecting the effectiveness of geotextile treatment.As the width of the collapse increases,the maximum vertical stress in the stable zone,the maximum tensile force of the reinforcement,and the vertical displacement of the fill all significantly increase at the edge of the collapse,where geotextiles with appropriate tensile strength should be selected according to the stress.When the collapse width is 2.0 m,the use of geotextiles with L≥1.5B to treat subgrade collapse has a good effect.The geotextile reinforced cushion layer is not suitable for treating large subgrade collapses with B≥2.0 m.This reveals the scope of application of geotextile methods for treating subgrade collapses.

关 键 词：加筋垫层 路基塌陷 对称半断面 模型试验 塌陷宽度 

分 类 号：U416[交通运输工程—道路与铁道工程]