加筋水泥土排桩加筋参数对重载铁路路基加固效果的影响  

Influence of Reinforcement Parameters of Reinforced Cement Soil Piles on Reinforcement Effect of Heavy Haul Railway Subgrade

作　　者：薛继连[1] 

机构地区：[1]神华集团有限责任公司,北京100011

出　　处：《中国铁道科学》2014年第6期15-20,共6页China Railway Science

基　　金：国家科技支撑计划项目(2013BAG20B00)

摘　　要：针对重载铁路的路基下沉、外挤等路基病害,采用有限元方法进行加筋水泥土排桩加固重载铁路路基时加筋参数对加固效果的影响分析。结果表明:加筋为工字钢和钢管时,不同设计轴重条件下路基顶面的最大沉降和坡面水平变形差异不大,但由于工字钢的施工控制及其与水泥土结合均好于钢管,因此建议加筋采用工字钢;在设置加筋水泥土排桩时,当加筋率达到一定量后,筋间距的改变对不同设计轴重条件下路基顶面最大沉降值和坡面水平变形的影响不大,因此实际工程中应根据路基变形的要求进行加筋率及加筋间距的优化设计;加筋水泥土排桩的加筋长度只要能延伸到线路荷载换算土柱的外边缘,就可达到满意的加固效果。In view of the settlement, extrusion and other defects of heavy haul railway subgrade, the in- fluence of reinforcement parameters on the reinforcement effect of heavy haul railway subgrade reinforced with cement soil piles was analyzed by using finite element method. The results showed that with I-beam and steel pipe for reinforcement, there was little difference between the maximum settlement of subgrade top and the horizontal deformation of slope surface under different design axle load. Since the construction control and cement soil combination of I-beam was better than that of steel pipe, it was suggested that I-beam should be adopted for reinforcement. When the reinforcement rate reached a certain amount on setting reinforced cement soil piles, the change of reinforcement spacing had little effect on the maximum settlement of subgrade top and the horizontal deformation of slope surface under different design axle load. Therefore, the reinforcement rate and spacing should be optimized according to the requirement for subgrade deformation in practical engineering. As long as the reinforcement length of reinforced cement soil piles extends to the outer edge of soil column for line load conversion, satisfactory strengthening effect can be achieved.

关 键 词：重载铁路 路基 加固 加筋水泥土排桩 加筋参数 

分 类 号：U213.15[交通运输工程—道路与铁道工程] TU473[建筑科学—结构工程]