摘要
为了研究人为坑洞对铁路路基稳定性的影响,分析了坑洞坍塌的原理,采用理论推导的方法,在荷载临界深度判别法的基础上考虑了土拱效应和坑洞侧墙稳定对临界深度计算的影响,从而求得修正后的临界深度判别公式,并采用数值模拟验证计算结果的准确性。然后结合工程实例,采用不同方法对坑洞稳定性进行评价,并分析各种评价方法优缺点。研究表明,相较于其他方法,修正后的荷载临界深度判别法能更准确地评价人为坑洞路基的稳定性。从既有线变形控制角度出发,对Ⅰ、Ⅱ级铁路的加固处理范围提出合理建议。
In order to study the influence of artificial cavity on the stability of railway subgrade,this paper analyzed the collapse mechanism of artificial cavity.The calculation formula of critical depth discrimination method considering soil arch effect and sidewall stability was derived by theoretical derivation.The accuracy of the calculation results was verified by numerical simulation.Based on a railway project,different evaluation methods were used to evaluate the stability of artificial cavity,and the advantages and disadvantages of various evaluation methods were analyzed.It was concluded that the modified critical depth discriminant method could help more accurately evaluate the stability of artificial cavity than other methods.Considering the angle of existing railway deformation control,reasonable range of reinforcement treatment of gradeⅠandⅡrailways were proposed.
作者
袁万军
YUAN Wanjun(China Railway Beijing Group Co.,Ltd.,Beijing 100038,China)
出处
《铁道勘察》
2023年第1期68-72,共5页
Railway Investigation and Surveying
关键词
运营铁路
路基
人为坑洞
稳定性
临界深度判别法
operating railway
subgrade
artificial cavity
stability
critical depth discriminant method
