基于正交数值试验桩锚支护结构参数反分析优化  

The back analysis and optimization of pile anchor support structure parameters based on orthogonal numerical experiments

作　　者：马文琪 罗伟庭 姚星鹏 Ma Wenqi;Luo Weiting;Yao Xingpeng(Changde Vocational and Technical College,Changde Hunan 415000,China;China Construction Fifth Engineering Bureau Co.,Ltd.,Changsha Hunan 410004,China)

机构地区：[1]常德职业技术学院,湖南常德415000 [2]中国建筑第五工程局有限公司,湖南长沙410004

出　　处：《山西建筑》2024年第20期79-83,共5页Shanxi Architecture

基　　金：湖南省教育厅科学研究项目(23C0482);常德职业技术学院重大专项(ZY2301);中建五局科技研发项目(2802-17-Z-044,2802-17-Z-045);中建股份科技研发计划资助(CSCEC-2019-Z-19)。

摘　　要：为研究桩锚支护结构设计参数对基坑稳定安全系数变化规律的影响,依托现场工程实例,采用正交数值试验分析不同桩锚支护结构设计参数对基坑稳定安全系数的影响规律,并采用回归法反分析优化桩锚支护结构设计参数。研究结果表明:基坑稳定安全系数随锚索安置倾角的增加而先增大后减小,且前期增加速率大于后期的减小速率;随着锚索锚固段长度的增加,基坑稳定安全系数增大且增大速率均逐渐减小并将最终趋于稳定值;基坑稳定安全系数随着桩底嵌固深度的增加而提高,随着桩间咬合量的增加而降低;锚固段长度和桩底嵌固深度是影响基坑稳定安全系数最显著的两个因素;最优参数选取锚索安置倾角为14.7°、锚固段长度为6.8 m、桩底嵌固深度为1.6 m、桩间咬合量为209.6 mm。In order to research the influence of design parameters of pile anchor support structure to the variation law of stability safety factor of foundation pit,based on on-site engineering examples,this paper analyzed the influence law of design parameters of different pile anchor support structure to stability safety factor of foundation pit using orthogonal numerical experiments,and analyzed and optimized the design parameters of pile anchor support structure using regression method.The research results indicated that the stability safety factor of foundation pit increases first and then decreases with the increase of anchor cable placement angle,and the rate of increase in the early stage is greater than the rate of decrease in the later stage;as the length of anchor cable anchorage section increases,the stability safety factor of foundation pit increases and the rate of increase gradually decreases and eventually approaching a stable value;the stability safety factor of foundation pit increases with the increase of the depth of pile bottom embedding,and decreases with the increase of interlocking amount between the piles;the length of anchorage section and the depth of pile bottom embedding are the two most significant factors affecting the stability and safety factor of foundation pit;the optimal parameter selection for anchor placement is an inclination angle of 14.7°,the anchorage section length of 6.8 m,the pile bottom embedding depth of 1.6 m,and the pile to pile interlocking amount of 209.6 mm.

关 键 词：桩锚支护结构 稳定安全系数 工程实例 正交数值试验 

分 类 号：TU473[建筑科学—结构工程]