摘要
基于高速铁路桩网结构各单元间的协调工作机理,对加筋网垫承担的竖向静动荷载及其引起的加筋体拉力、边坡推力效应引起的加筋体拉力等计算方法进行研究。土拱效应引起的桩间土竖向应力采用球形拱假设计算,动荷载引起的竖向应力采用Boussinesq假设计算;加筋体拉力由竖向荷载和边坡推力效应两部分引起,对于竖向荷载引起的拉力采用悬索理论计算,并首次考虑加筋体初始挠度的影响;计算边坡推力效应时,不仅考虑路基边坡主动土压力的产生和平衡,还综合考虑基底摩擦的协同工作。加筋网垫受到的拉力全部由加筋体承担。作为主要加筋体材料的土工格栅加筋体的最低强度可取使用年限内发生失效应变时的强度,但应考虑工程施工和环境等因素的影响。
On account of the coordinated working mechanisms among each element in the geosynthetics re- inforced and pile supported embankments （GRPS） of high speed railway, the calculation methods for the static and dynamic vertical loads undertaken by reinforced bedding and the tensile force of reinforced body resulted from these loads, as well as the tensile stress of reinforced body caused by the lateral spreading effect of slope were studied. The vertical stress of soil among piles caused by arching effect was analyzed by global arching hypothesis and the vertical stress resulted from dynamic load was analyzed by Boussinesq hypothesis. The tensile force of reinforced body was caused by vertical load and the lateral spreading effect of slope. The tensile force caused by vertical load was analyzed by cable theory and the influence of the ini- tial deflection of reinforced body was considered first. Not only the occurrence and balance of active earth pressure of subgrade slope, but also the cooperative work of the friction of embankment bottom should be comprehensively considered for analyzing the thrust force of slope. The tension suffered by reinforced bed- ding was undertaken totally by reinforced body. The minimum intensity of geosynthetics, which is the up- permost reinforced body, could be equal to the intensity when critical strain occurred in service life. How- ever, the influences of project construction and climatic environment should be taken into account.
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
2013年第5期1-5,共5页
China Railway Science
基金
铁道部科技研究开发计划项目(2006G013)
关键词
高速铁路
桩网结构
加筋网垫
土拱效应
推力效应
加筋体拉力
High speed railway Pile-net structure Reinforced bedding Soil arching effect Lateral sprea-ding effect~ Tensile force of reinforced body
