摘要
为明确土钉支护下深基坑多级放坡开挖对基坑边坡稳定性的影响,以京港高铁九江-南昌段机场一号场隧道深基坑工程为研究对象,利用PLAXIS 3D软件建立深基坑全过程施工数值模型,分析土钉支护下深基坑多级放坡开挖时土钉长度、倾角、间距对土钉轴力、深基坑边坡位移的影响,并采用软件内嵌的强度折减法分析不同参数对深基坑边坡安全系数的影响规律。结果表明,土钉的长度超过6 m后,土钉支护效果并不会随着土钉长度的增加而出现明显的增强;土钉倾角为15°时的土钉支护效果最好,土钉间距取1.5 m最合理。
order to clarify the influence of multi-level slope excavation of deep foundation pit under soil nailing support on the stability of foundation pit slope.Based on the deep foundation pit project of Airport No.1 field tunnel in the Jiujiang-Nanchang section of high-speed railway as the research object,this paper uses PLAXIS 3D software to establish a numerical model of the whole process of deep foundation pit construction,and analyzes the influence of soil nailing length,soil nailing inclination and soil nailing spacing on the axial force of soil nailing and the displacement of deep foundation pit slope under multi-level slope excavation of deep foundation pit with soil nailing support.Finally,the influence law of different parameters on the safety factor of deep foundation pit slope is analyzed by using the strength reduction method.The results show that when the length of soil nailing reaches 6 m and then increases,the supporting effect is not obvious,the optimum soil nailing inclination is about 15°,and the optimum soil nailing spacing is about 1.5 m.
作者
曹康俊
CAO Kangjun(China Railway 12th Bureau Group 4th Engineering Co.,Ltd.,Xi'an 710021,China)
出处
《四川建材》
2025年第8期124-127,共4页
Sichuan Building Materials
关键词
土钉
深基坑
数值模拟
边坡稳定性
soil nailing
deep foundation pit
numerical simulation
slope stability
