基于时序InSAR遥感监测的中山市软土地面沉降特征及成因研究
STUDY ON THE CHARACTERISTICS AND GENETIC OF SOFT LAND SUBSIDENCE IN ZHONGSHAN CITY BASED ON INSAR REMOTE SENSING MONITORING
李长山 1迟帅2
作者信息
- 1. 中山市海洋与地质环境监测站,中山 528400
- 2. 广东省地质局第十地质大队,中山 528427
- 折叠
摘要
珠三角地区地面沉降灾害时有发生,受限于现有GPS、水准监测等手段监测范围窄、耗时长等问题,难以对区域范围内的软土地面沉降特征做出精准判识.因此,本文引入时序InSAR的先进遥感监测技术,对研究区中山市广域地面沉降特征及成因深入分析.研究结果表明:(1)中山市软土地面沉降受内在因素和外在因素的共同影响,内在因素主要为软土的工程地质特性、软土固结程度,外在因素主要为地下水开采、车辆动荷载和建筑物静荷载.(2)中山地区软土地面沉降类型主要为:新近沉积松散堆积物自重固结型、大面积欠固结填土压密固结型、地下水位下降导致压密固结型、交通线路车辆动荷载压密固结型和地面建筑物静荷载压密固结型.(3)中山市软土地面沉降成因为:受自重应力、动、静荷载附加应力、地下水位波动导致软弱土体颗粒骨架改变、有效应力重分布,产生压密固结,诱发地面沉降灾害.(4)InSAR监测结果表明,2015-2018年中山市最大沉降区位于坦洲镇,最大沉降速率为35 mm/a,2019年～2020年中山市坦洲镇地面沉降影响范围最广,沉降速率最快,区内最大沉降速率超过38 mm/a.
Abstract
Land subsidence disasters occur from time to time in the Pearl River Delta region.Due to the problems such as narrow monitoring range and long time consuming by existing GPS,level monitoring and other means,it is difficult to accurately identify the characteristics of soft land subsidence within the region.Therefore,the advanced remote sensing monitoring technology of InSAR was introduced in this paper to deeply analyze the wide-area land subsidence in Zhongshan City in the study area.The results show that:(1)The settlement of soft soil in Zhongshan City is affected by both internal and external factors;(2)The main settlement types of soft land in Zhongshan area are:self-weight consolidation of newly deposited loose deposits,compaction and consolidation of large-area under consolidation fill,compaction and consolidation caused by groundwater level drop,compaction and consolidation under dynamic load of traffic line vehicles and compaction and consolidation under static load of ground buildings;(3)The cause mechanism of soft soil surface settlement in Zhongshan City is as follows:the gravity stress,the additional stress of dynamic and static load,and the fluctuation of groundwater level lead to the change of the particle skeleton of soft soil and the redistribution of effective stress,resulting in compaction and consolidation and inducing ground settlement disaster;(4)The InSAR monitoring results showed that the largest subsidence area of Zhongshan City was located in Tanzhou Town from 2015 to 2018,and the maximum subsidence rate was 35 mm/a.
关键词
地面沉降/时序InSAR/遥感监测/沉降成因Key words
land subsidence/temporal InSAR/remote sensing monitoring/subsidence genetic引用本文复制引用
出版年
2024
NETL
NSTL
万方数据