基于数值模拟和现场实测的深层水平位移对基坑报警值延迟的研究  

Study on the delay of deep horizontal displacement on pit alarm value based on numerical simulation and field measurement

作　　者：孙浩 李四全 孙亚男 闫冠宇 陈林 张洪 SUN Hao;LI Siquan;SUN Yanan;YAN Guanyu;CHEN Lin;ZHANG Hong(Survey and Design Institute of Nonferrous Geological Bureau of Yunnan Province,Kunming 650000,Yunnan,China;Southwest Nonferrous Kunming Exploration Surveying ANG Designing(institute)Inc.,Kunming 650000,Yunnan,China)

机构地区：[1]云南省有色地质局勘测设计院,云南昆明650000 [2]西南有色昆明勘测设计(院)股份有限公司,云南昆明650000

出　　处：《矿产勘查》2024年第S2期668-676,共9页Mineral Exploration

摘　　要：深层水平位移是基坑监测较为重要的一种,由于深层水平位移监测点布置位不同监测数据不尽相同,深层水平位移监测数据是否报警并不能准确判断,这也给基坑安全带来隐患。本文基于某基坑项目典型剖面的勘察设计方案,采用深层水平位移的实测值与数值模拟值进行比较,首先验证本构模型及本构参数的合理性,在此基础上进一步采用数值模拟布置于不同位置的深层水平位移监测点在不同工况下的变形差异,总结出距离支护结构越远的深层水平位移监测值越小的规律,进一步得到将深层水平位移监测点设置在支护结构外侧深层水平位移存在报警延迟的结论,并在此基础上提出一种采用抗倾覆安全系数反向计算较为合理的确定深层水平位移报警值的方法。Deep horizontal displacement is one of the more important types of pit monitoring,due to the deep horizontal displacement monitoring point arrangement of different monitoring data is not the same,deep horizontal displacement monitoring data whether alarm cannot be accurately judged,which also brings hidden dangers to the pit safety.In this paper,based on the investigation and design scheme of a typical section of a foundation pit project,the measured value of deep horizontal displacement is compared with the numerical simulation value,firstly,the reasonableness of the intrinsic model and the intrinsic parameters are verified,and based on this,the numerical simulation is further used to simulate the deformation difference of the monitoring point of the deep horizontal displacement arranged in different positions under different working conditions,and it is summarized that the further the distance from the supporting structure,the smaller the value of the monitoring of deep horizontal displacement is,and furthermore,it is obtained that the monitoring data of the deep horizontal displacement will be changed into the monitoring data of the deep horizontal displacement.On the basis of this,a numerical simula-tion is used to simulate the deformation difference between different locations of deep horizontal displacement monitoring points under different working conditions,and it is summarized that the farther away from the support-ing structure,the smaller the monitoring value of deep horizontal displacement is,and it is concluded that there is a delay in the alarm of deep horizontal displacement when the deep horizontal displacement monitoring points are set at the outer side of the supporting structure.

关 键 词：基坑 深层水平位移 数值模拟 报警值 延迟 

分 类 号：TU473[建筑科学—结构工程]