摘要
参照规范计算方法或模型,探讨并提出"前斜后直"倾斜双排桩支护结构抗倾覆稳定性计算方法,通过工程应用分析表明,因采取前桩倾斜支护结构,抗倾覆稳定安全系数提高56.8%,显著增加了基坑支护安全。为进一步研究倾斜桩抗倾覆稳定性安全系数影响因素,分别计算"前斜后直"倾斜双排桩在不同嵌固深度、排距、前桩倾斜角度情况下的抗倾覆稳定性安全系数,同时计算垂直双排桩抗倾覆稳定性安全系数并作对比分析,结果表明:随着嵌固深度的加大,倾斜双排桩相比垂直双排桩在各地层中抗倾覆稳定性安全系数总体提升幅度>60%;在2.5d~5d排距范围内,随着排距增加,抗倾覆稳定性安全系数总体提升幅度>85%;随着前桩倾斜角度的增加,各地层抗倾覆稳定性安全系数随角度近似线性增加。
Referring to the standard calculation method or model,the calculation method of antioverturning stability of the inclined double-row pile support structure with "forward slope and straight back slope"is discussed and put forward.The engineering application analysis shows that the safety coefficient of anti-overturning stability is increased by 56.8%,which significantly increases the safety of foundation excavation support.In order to further study the factors influencing the safety factor of antioverturning stability of tilted pile,the safety factor of anti-overturning of tilted pile with different embedded depth,row spacing and tilt angle was calculated respectively.At the same time,the stability safety factor of vertical double row pile against overturning is calculated for comparative analysis.The results show that with the increase of embedded depth,the anti-overturning safety coefficient of the inclined double-row pile in various layers increases by more than 60% compared with the vertical doublerow pile.In the range of 2.5 d~5 d row spacing,with the increase of row spacing,the overall increase of anti-overturning safety coefficient is more than 85%.With the increase of the tilt angle of the front pile,the anti-overturning safety coefficient of each layer increases linearly.
作者
赖国梁
田野
邓昌福
陈国
张松波
LAI Guoliang;TIAN Ye;DENG Changfu;CHEN Guo;ZHANG Songbo(General Construction Company of CCTEB Group Co,Itd.,Wuhan,Hubei 430064,China;Hubei Building Construction Technology Co.,Ltd.of CCTEB Group Co.,Ltd.,Wuhan,Hubei 430070,China)
出处
《施工技术》
CAS
2021年第1期53-56,共4页
Construction Technology
基金
中建股份科技研发课题(CSCEC-2020Z-34)。
关键词
基坑
支护
倾斜桩
双排桩
抗倾覆稳定性
安全系数
foundation excavation
supports
inclined piles
double row piles
anti-overturning stability
safety factor
