Hot Paper - Polyurethane grouting materials with different compositions for the treatment of mud pumping in ballastless track subgrade beds: properties and application effect

Polyurethane grouting materials with different compositions for the treatment of mud pumping in ballastless track subgrade beds: properties and application effect

不同成分聚氨酯灌浆料处理无砟轨道路基床抽泥：性能及应用效果
バラストレス軌道路床における泥ポンプの処理のための異なる組成のポリウレタングラウト材料：特性と適用効果
밸러스트가 없는 노상 노반의 진흙 펌핑 처리를 위한 다양한 조성의 폴리우레탄 그라우팅 재료: 특성 및 적용 효과
Materiales de lechada de poliuretano con diferentes composiciones para el tratamiento de bombeo de lodo en lechos de subrasantes de vía sin balasto: propiedades y efecto de la aplicación
Matériaux de scellement en polyuréthane de différentes compositions pour le traitement du pompage de boue dans les lits de fondation des voies sans ballast : propriétés et effet de l'application
Полиуретановые тампонажные материалы различного состава для обработки бурового раствора в безбалластных основаниях земляного полотна: свойства и эффект от применения

Zhichao Huang 黄志超 ¹ ², Qian Su 苏谦 ¹ ², Junjie Huang 黄俊杰 ¹ ², Minqi Dong 董敏琪 ¹, Dong Li ³, Ting Liu ⁴

¹ School of Civil Engineering, Southwest Jiaotong University, Chengdu, 610031, China
中国成都西南交通大学土木工程学院
² Key Laboratory of High-Speed Railway Engineering of Ministry of Education, Southwest Jiaotong University, Chengdu, 610031, China
中国成都西南交通大学高速铁路线路工程教育部重点实验室
³ China Railway Fourth Survey and Design Institute Group Co., Ltd., Wuhan, 430000, China
中国武汉中铁第四勘察设计院集团有限公司
⁴ China Railway Construction Kunlun Investment Group Co., Ltd., Chengdu, 610040, China
中国成都中国铁建昆仑投资集团有限公司

https://doi.org/10.1007/s40534-021-00270-x

https://link.springer.com/article/10.1007/s40534-021-00270-x

Railway Engineering Science, 15 February 2022

Abstract

Mud pumping in subgrade beds under ballastless tracks will deteriorate the dynamic performance of infrastructure under railway lines, reduce the smoothness of the railway lines, and seriously affect the comfort and safety of the trains. Due to their good mechanical properties, two-component polyurethane materials can be used for grouting to treat the fouling problems caused by ballastless track mud pumping.

To develop a polyurethane formula suitable for the treatment of ballastless track mud pumping, we first performed indoor experiments to investigate the mechanical properties and gelation time of polyurethane elastomers synthesized with different raw material composition ratios, to determine an optimal composition ratio of the raw materials. Then, we conducted a dynamic field test to verify the remediation effect of the polyurethane material fabricated according to the design ratio.

The results showed that polyurethane grouting material with the selected design ratios improved the contact characteristics between the surface layer of the subgrade bed and the base plate in the area, coordinating the dynamic response between the track structure and the subgrade bed. Thus, the obtained polyurethane grouting material could be used to renovate mud pumping areas of ballastless tracks with a good treatment effect.

Reviews and Discussions