摘要
利用小基线集合成孔径雷达干涉测量的方法和试验相结合的手段,获取兰州新区2015-2016年的地面沉降范围和速率情况,结合地质环境背景和人类工程活动,分析了地面沉降的发生规律.结果表明,地面沉降主要分布在新区南部、中东部和西北部,最大沉降速率达到55.0 mm/a.地面沉降与地层岩性和断层分布有密切联系,与地下水位变化呈弱相关关系,填方、建筑荷载、道路建设和农业灌溉加剧地面沉降发生;填土相对原生黄土具有更大的孔隙比和压缩系数,在水的作用下更易发生淋滤和溶蚀,发生湿陷并进一步导致不均匀沉降.建议在城市规划时要对高层建筑的施工建设(特别是填土区)进行控制,减少地面荷载和增加地面的承载力,从预防的角度减少地面沉降现象及其危害.
This paper used the combination of small baseline subset method and test to obtain land subsidence range and rate in Lanzhou New District from 2015 to 2016,and in view of the geological environment background and human engineering activities,the law of the occurrence of land subsidence was analyzed.The result showed that,land subsidence was mainly distributed in the southern,middle-eastern and northwestern part of the area,and the maximum sedimentation rate was 55.0 mm/a.Land subsidence was closely related to stratum lithology,fault distribution and weakly related to changes in the groundwater level.Filling,building loads,road construction and agricultural irrigation aggravated ground subsidence;compared with the original loess,the filling had a larger void ratio and a compression coefficient;under the action of water,leaching and dissolution were more likely to occur,which caused a collapse to happen and alao a further differential settlement to occur.It is suggested that the construction of high-rise buildings(especially in the filling areas)should be controlled during urban planning,in order to reduce ground loads and increase the bearing capacity of the ground,and to reduce the phenomenon of ground subsidence and its damage from the perspective of prevention.
作者
赵富萌
陈冠
张毅
孟兴民
刘义
王彪
王思源
Zhao Fu-meng;Chen Guan;Zhang Yi;Meng Xing-min;Liu Yi;Wang Biao;Wang Si-yuan(Gansu Environmental Geology and Geohazards Engineering Research Centre,College of Earth and Environmental Sciences,Lanzhou University,Lanzhou 730000,China;Hydrogeology and Environmental Geology Survey Center of China Geological Survey,Baoding 071051,Hebei,China)
出处
《兰州大学学报（自然科学版）》
CAS
CSCD
北大核心
2019年第6期707-715,共9页
Journal of Lanzhou University(Natural Sciences)
基金
中国地质调查兰州-西宁经济区综合地质调查项目(121201012000150001)
甘肃省青年科技基金(1606RJYA235)
国家自然科学基金青年基金项目(41702292).
关键词
小基线集技术
地面沉降
削山造地
兰州新区
small baseline subset
land subsidence
cutting mountain and filling valley
Lanzhou New Dictrict
