摘要
在富水粉砂层铁路路基这一地质条件下,用FLAC3D软件对既有铁路路基注浆加固进行模拟,研究注浆过程地层变形规律和注浆地层力学性能提升的规律。采用不同注浆压力、不同注浆管间隔距离的不同工况组合,分别分析不同工况对路基沉降的影响,结果表明:随着注浆压力的增大,注浆力作用使得土体挤压上拱的影响越来越大,土体应力改变也越来越大,并且塑性区的范围也越来越大;而当注浆管的布置间距不断增大时,注浆力作用使得土体挤压上拱的影响越不明显,应力改变越不显著,并且塑性区的范围也越来越小。
Under the specific geological conditions of the railway subgrade with water-rich silt sand layer,FLAC3D software is used to simulate the grouting reinforcement of the existing railway subgrade to study the laws of grouting deformation of the ground and the laws of improving the mechanical properties of the grouted ground.The combinations of different working conditions of different grouting pressures and different spacing distances of the grouting pipes are used to analyze the influence of different working conditions on the settlement of subgrade.The results show that as the grouting pressure increases,the effect of the grouting pressure on the soil squeezed upward arching.When the spacing of grouting pipes is increasing,the effect of grouting force on the soil squeezed upward arching is less significant,the stress change is getting less significant,and the range of plastic zone becomes smaller and smaller.
作者
徐旭
薛彦雨
张振雨
牛建鑫
张文涛
Xu Xu;Xue Yanyu;Zhang Zhenyu;Niu Jianxin;Zhang Wentao(China Railway 24th Bureau Group Co.,Ltd.,Shanghai 200433,China)
出处
《城市建筑》
2021年第24期178-182,198,共6页
Urbanism and Architecture
基金
国家自然科学基金项目资助(5170069)。
关键词
路基沉降
注浆压力
注浆管
subgrade settlement
grouting pressure
injection pipe
