Based on the safety factor and instability change of soil napping slope+ground wall+internal support combined support in the construction process, the safety factor of combined support in the project of Jinan Metro Line 6 is studied by using the methods of limit balance and strength reduction. Meanwhile, ABAQUS finite element software is used for numerical simulation. The energy method is used to deduce the torque of the main and passive earth pressure at the lowest support point of the inner supporting structure, and then the stability safety factor of the foundation pit anchoring depth based on the energy method and the linear+logarithmic spiral sliding surface is obtained, and the results are compared with the traditional calculation method. Based on the strength reduction method, the stability coefficient of foundation pit after excavation is obtained in ABAQUS, and the coefficient changes before and after reserving core soil are compared. With the increase of excavation depth, the contribution of reserved core soil in the combined support system gradually increases, and the development of displacement deformation and plastic deformation of foundation pit is inhibited, which shows that the stability coefficient of foundation pit is gradually increased.
Pang Huan
,
Xie Xiaoxu
,
Xu Zhenxiang
,
Su Li
,
Deng Ningzao
. Deformation and Stability Analysis of Deep Foundation Pit under the Synergistic Action of Various Supports[J]. Chinese Journal of Underground Space and Engineering, 2024
, 20(S2)
: 981
-988
.
DOI: 10.20174/j.JUSE.2024.S2.55
[1] 黄宗辉. 复合地层地铁基坑稳定性及支护参数优化研究[D].南宁:广西大学,2021.
[2] 王龙飞.长江漫滩地层深大基坑开挖设计及稳定性分析[J].科学技术创新,2022(20):97-100.
[3] 张兆. 基于能量法的窄型基坑嵌固深度及抗隆起稳定性分析研究[D].兰州:兰州理工大学,2023.
[4] 韩同春,谢灵翔,刘振.坑中坑条件下基坑有限土体的被动土压力计算[J].岩土力学,2018,39(12):4404-4412.
[5] 商兆涛,姚家李,夏琴,等.基于强度折减理论的深基坑稳定性分析[J].合肥工业大学学报(自然科学版),2022,45(9):1209-1215.
[6] 彭俊仁,万琪伟,丁海滨,等.基于强度折减的坑中坑稳定分析方法[J].地下空间与工程学报,2023,19(增1):381-390,398.
[7] 周杰. 复杂条件下某地下工程深基坑支护结构设计与施工关键技术研究[D].扬州:扬州大学,2022.
[8] 夏文宇.佛山淤泥土深基坑变形实测分析及控制措施[J].地下空间与工程学报,2022,18(S2):1056-1062.
[9] 杨一洲.基于深基坑土钉支护的可靠性分析[J].土工基础,2022,36(3):395-399.
[10] 杨善统.建筑密集区超大深基坑开挖变形模型试验研究[J].地下空间与工程学报,2022,18(增1):147-155.
[11] 王洪新,陈建军,刘冀山.基坑抗隆起稳定安全系数实用计算分析与应用[J].岩石力学与工程学报,2007(增1):3223-3230.
[12] 吕沛松. 与锚杆结合的复合加筋土边坡安全系数影响分析[D].太原:中北大学,2023.
[13] Pan W, Wang Z, Diao Y, et al. Stability analysis and safety factors of the excavation face of a pipe screen tunnel in a soft soil area[J]. Applied Sciences,2023,13(20):11120-11140.
[14] Sumit K, Shankar S C, Avijit B. The effect of slope height and angle on the safety factor and modes of failure of 3D slopes analysis using limit equilibriummethod[J]. Beni-Suef University Journal of Basic and Applied Sciences,2023,12(1),84:1-9.
[15] 周勇,赵元基,王正振,等.基于位移梯度法的深基坑桩锚支护结构动态稳定性分析[J].兰州理工大学学报,2022,48(6):110-119.
[16] 谢晟.广州地区深厚软土地层深基坑大面积放坡支护有限元数值模拟研究[J].广东土木与建筑,2022,29(1):1-4.
[17] 郭涛.考虑安全系数的坑中坑开挖基坑失稳模式分析[J].江苏建筑,2023(1):83-86,90.
[18] 臧泽光,刘记帅,王强,等.不同放坡开挖工况下基坑边坡稳定性对比研究[J].隧道与轨道交通,2021(增1):122-124.
[19] Wang I L, Li X M, Yin S, et al. Analysis of rainfall infiltration and improvement of the analytical solution of safety factors on unsaturated inner dump slopes: A case study[J]. Processes,2022,10(11):2407-2424.
