南宁在建地铁沿线地表沉降监测

doi:10.12082/dqxxkx.2019.190151

地球信息科学学报 ›› 2019, Vol. 21 ›› Issue (9): 1467-1478.doi: 10.12082/dqxxkx.2019.190151

南宁在建地铁沿线地表沉降监测

覃纹³,黄秋燕^1,^2,³,庾露^3,^*(),胡宝清^1,²

^1. 南宁师范大学北部湾环境演变与资源利用重点实验室,南宁 530001
^2. 南宁师范大学广西地表过程与智能模拟重点实验,南宁 530001
^3. 南宁师范大学地理科学与规划学院,南宁 530001

收稿日期:2019-04-03 修回日期:2019-07-01 出版日期:2019-09-25 发布日期:2019-09-24
作者简介:覃纹（1996-）,女,广西钦州人,硕士生,主要从事合成孔径雷达干涉测量、资源环境遥感研究。E-mail: qinw0717@foxmail.com。
基金资助:
国家自然科学基金地区项目(41661090);国家自然科学基金地区项目(41661021);广西自然基金创新团队项目(2016JJF15001);南宁师范大学校级科研启动项目(0819-2017L05)

Surface Subsidence Monitoring during the Construction of Nanning Subways

QIN Wen³,HUANG Qiuyan^1,^2,³,YU Lu^3,^*(),HU Baoqing^1,²

^1. Key Laboratory of Environmental Change and Resource Utilization of Beibu Gulf, Nanning Normal University, Nanning 530001, China
^2. Key Laboratory of Surface Process and Intelligent Simulation, Nanning Normal University, Nanning 530001, China
^3. School of Geographical Science and Planning, Nanning Normal University, Nanning 530001, China

Received:2019-04-03 Revised:2019-07-01 Online:2019-09-25 Published:2019-09-24
Contact: YU Lu
Supported by:
National Natural Science Foundation of China(41661090);National Natural Science Foundation of China(41661021);Guangxi Natural Science Fund Innovation Team Project(2016JJF15001);Nanning Normal University School-level Scientific Research Launch Project(0819-2017L05)

摘要/Abstract

摘要：

南宁作为北部湾经济区的核心城市及中国-东盟博览会的永久举办地,正处于城市地铁修建及工程建设的高峰期。南宁位于复杂地质水文条件的南宁盆地中西部,地铁施工及运行有可能引发地表沉降等潜在风险,但关于南宁地铁修建区的沉降规律系统的认识仍十分有限。利用永久性散射体雷达干涉测量技术（Permanent Scatterers InSAR,PS-InSAR）处理54景Sentinel-1A影像,监测了2017年4月-2018年12月南宁市区地表沉降信息。结果表明,监测期内南宁地表形变速率为-23.8~9.0 mm/a,研究区大部分区域稳定,沉降点分布零星;4个重点沉降区位于蒲庙镇、九曲湾农场、江南地铁站及北湖-万秀村-虎丘一带;重点沉降区形变曲线总体上随时间变化呈现出不均匀下降;沉降成因可能与膨胀土膨胀特性、弃土滑坡、施工作业、列车流量过大及地下水位下降有关。5条地铁沉降值均属于安全范围。研究表明,南宁雨季降水丰富,地铁修建区表土以松散的第四系覆盖层为主,下伏基岩以工程力学性质存在一定不稳定性的第三系膨胀土为主,建议利用PS-InSAR技术对沉降重点区域及地铁沿线开展长期监测。

关键词: 地铁, Sentinel-1A, PS-InSAR, 地表沉降, 第三系膨胀土, 南宁

Abstract:

Nanning is the core city of the Beibu Gulf Economic Zone and the permanent venue of the China-ASEAN Expo, which is undergoing the construction peak of urban subways. Nanning is located in the central and western part of the Nanning Basin, where the geological and hydrological conditions are complicated. The construction and operation of subways may cause potential risks such as surface subsidence. However, it remains understudied regarding the surface subsidence along Nanning subways. In this paper, 54 Sentinel-1A images of Nanning city from April 2017 to December 2018 were processed by Permanent Scatterers Interferometric Synthetic Aperture Radar （PS-InSAR）, and then the surface subsidence information was extracted. Results showed that the surface deformation rate was -23.8~9.0 mm/a during the monitoring period, and most of the study area was stable, and the settlement point distribution was sporadic. There were four key subsidence areas , including Pumiao Town, Jiuquwan Farm, Jiangnan Subway Station, and Beihu- Wanxiu Village- Huqiu. The deformation curve of key settlement areas showed an uneven decline trend with time; the reason causing settlement may be attributed to the expansion characteristics of expansive soil, spoil landslide, construction operation, excessive train flow, and drop in the groundwater level. The sedimentation value of the five subways were all within the safe range. The rainy season precipitation of Nanning is rich, and the topsoil of the subway construction area is mainly composed of loose Quaternary overburden, where the underlying bedrock is mainly composed of Tertiary expansive soil with certain instability of engineering mechanics. Therefore, our findings suggest that the PS-InSAR technology should be used for long-term monitoring of key settlement areas and subways of Nanning for safe metro operation.

Key words: Subway, Sentinel-1A, PS-InSAR, surface subsidence, tertiary expansive soil, nanning

覃纹,黄秋燕,庾露,胡宝清. 南宁在建地铁沿线地表沉降监测[J]. 地球信息科学学报, 2019, 21(9): 1467-1478.DOI:10.12082/dqxxkx.2019.190151

QIN Wen,HUANG Qiuyan,YU Lu,HU Baoqing. Surface Subsidence Monitoring during the Construction of Nanning Subways[J]. Journal of Geo-information Science, 2019, 21(9): 1467-1478.DOI:10.12082/dqxxkx.2019.190151

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时间		空间基线/m	时间	时间基线/d	空间基线/m	时间	时间基线/d	空间基线/m
2017-04-03	0	-35.0929	2017-11-05	216	45.2097	2018-06-09	432	-24.6097
2017-04-15	12	-74.4984	2017-11-17	228	41.5198	2018-06-21	444	-1.7339
2017-04-27	24	70.6223	2017-11-29	240	15.9682	2018-07-03	456	73.8204
2017-05-09	36	-75.0670	2017-12-11	252	33.7829	2018-07-15	468	35.5915
2017-05-21	48	-43.8730	2017-12-23	264	82.5005	2018-07-27	480	47.1928
2017-06-02	60	-30.8616	2018-01-04	276	82.5183	2018-08-08	492	20.8403
2017-06-14	72	10.9047	2018-01-16	288	46.8289	2018-08-20	504	-36.5445
2017-06-26	84	20.1468	2018-01-28	300	50.1835	2018-09-01	516	-73.3495
2017-07-08	96	67.6315	2018-02-09	312	-20.2486	2018-09-13	528	29.7106
2017-07-20	108	36.1572	2018-02-21	324	-5.6931	2018-09-25	540	62.7836
2017-08-01	120	-50.6033	2018-03-05	336	0	2018-10-07	552	52.9528
2017-08-13	132	-61.7094	2018-03-17	348	28.3550	2018-10-19	564	-55.9534
2017-08-25	144	13.5000	2018-03-29	360	30.5529	2018-10-31	576	-64.3076
2017-09-06	156	70.6805	2018-04-10	372	8.8881	2018-11-12	588	-17.6692
2017-09-18	168	-20.5977	2018-04-22	384	9.5435	2018-11-24	600	68.2421
2017-09-30	180	-65.7919	2018-05-04	396	37.1262	2018-12-06	612	-4.2850
2017-10-12	192	-82.5454	2018-05-16	408	12.2794	2018-12-18	624	84.5637
2017-10-24	204	-49.4931	2018-05-28	420	-6.0092	2018-12-30	636	-27.8057

南宁在建地铁沿线地表沉降监测

Surface Subsidence Monitoring during the Construction of Nanning Subways

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