摘要
结合成昆铁路K13+698～+925一段由成都粘土(膨胀土)填筑的高约7m路堤基床下沉病害的整治工程,进行了基床换填土工格室加筋砂夹卵石垫层的现场动静态试验,测试在列车荷载作用下基床表层的动应力、动变形、加速度等动力响应及累积下沉数据,比较在基床换填深度相同的条件下,有(无)土工格室加筋的砂夹卵石垫层的不同加固效果。试验表明,换填土工格室加筋砂夹卵石垫层的基床加固方案,能有效地改善基床的动力特性,十分显著地降低基床产生的残余变形,用于提速线路的基床加固可取得较大的社会经济效益。
Field static and dynamic tests are conducted on the sandy gravel subgrade bed reinforced with geocells in the K13+698～+925 section of the Chengkun Railway, where the 7 m high embankment is filled with Chengdu clay and has excessive settlement distress. Accumulated deformation under the application of axle loading and associated dynamic responses such as the stress, dynamic deformation and acceleration rate are recorded during the tests. Subgrade performance with and without geocell stabilization at the same filling depths is analyzed. Test study shows that geocell reinforcement to sandy gravel subgrades can effectively improve dynamic behaviors of subgrades, significantly reduce residual deformation of subgrades, and produce social and economic benefits in the upgrading of the existing railway lines.
出处
《铁道学报》
EI
CAS
CSCD
北大核心
2004年第3期98-102,共5页
Journal of the China Railway Society
基金
成都铁路局科技发展计划项目(CX9901)
关键词
土工格室
基床加固
动力特性
累计下沉
现场试验
geocell
subgrade reinforcing
dynamic characteristic
residual settlement
field experiment
