基于IBIS-L的某黄土高填方边坡支护结构变形特征

doi:10.13278/j.cnki.jjuese.20180172

摘要/Abstract

摘要： 直立式填方支护在建筑、机场、公路、铁路、矿山等大型基础设施建设项目中的作用不可或缺，但黄土地区边坡支护结构易出现桩基沉降、桩体弯曲、桩板墙开裂的现象。为进一步定量分析其变形特征，采用地形微变监测仪（IBIS-L）进行全天候不间断监测，通过对采集的点面数据进行研究，结果表明：1）支护结构变形总体上具有明显的区域性差异，近15 d的最大变形量为26.6 mm；2）对象监测点位移呈间隔24 h"波浪形"增长规律，且无收敛趋势，极可能导致边坡整体失稳；3）结合温度监测，以监测点Pix8为例，理论计算结果与监测数据相吻合，揭示了s-t曲线呈"波浪形"增长的原因，得出大体积混凝土在大气温度场条件下的变形具有"滞后效应"的响应特征。

关键词: 黄土, 高填方边坡, 支护结构, 变形, 监测

Abstract: In a construction of airport, highway, railway, mine and other large-scale infrastructure construction projects, a vertical fill support structure become an indispensable part with the urbanization of a loess area. However, the slope supporting structure in loess area is prone to pile foundation settlement, pile bending,and pile plate wall cracking. In order to analyze its deformation characteristics, an all-weather continuous monitoring was carried out by using IBIS-L. The point and surface data collected show the followings:1) the deformation of supporting structure showed obvious regional differences in general, the maximum deformation value of the last 15 days was 26.6 mm; 2) the displacement of object monitoring points increased in a "wavy" shape at intervals of 24 hours with no convergence trend, which may cause the overall instability of the slope; 3) taking Pix8 as an example, combined with a temperature monitoring, the theoretical calculation results agreed with the monitoring data, which revealed the reason why the s-t curve increased in wave shape. It is concluded that the deformation of mass concrete in an atmospheric temperature field has the characteristic of "lag effect".

Key words: loess, high fill slope, supporting structure, deformation, monitoring

中图分类号:

P225

魏恺泓, 裴向军, 张世殊, 冉从彦, 崔中涛, 李青春, 李进元. 基于IBIS-L的某黄土高填方边坡支护结构变形特征[J]. 吉林大学学报(地球科学版), 2018, 48(5): 1556-1565.

Wei Kaihong, Pei Xiangjun, Zhang Shishu, Ran Congyan, Cui Zhongtao, Li Qingchun, Li Jinyuan. Deformation Characteristics of Loess High Fill Slope Support Structure Based on IBIS-L[J]. Journal of Jilin University(Earth Science Edition), 2018, 48(5): 1556-1565.

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