用重力测量技术观测城市地表下沉的实验研究

doi:10.6038/cjg2020N0080

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Abstract Experimental study of the surface subsidence in the city using the gravity observing techniques is carried out in the paper. There are 7 gravity campaigns at regions with comparatively large surface subsidence in Wuhan city, China. The gravity results are finally verified by the vertical displacements observed by D-InSAR. Numerical results show that the point-value mean accuracies after the whole network adjustment for all the 7 gravity campaigns are all smaller than 10×10^-8m·s^-2, which indicates that high-accuracy regional gravity variations can be obtained by gravity measurements. The gravity change between the 7^th and the 1^st campaign is compared with vertical displacements observed by D-InSAR in almost the same time interval. The comparison shows that most of the regions with increased gravity change are coincided with those that have surface subsidence observed by D-InSAR, which accounts for the gravity increase mainly induced by the surface subsidence. The largest gravity change obtained from the 1^st campaign to the 2^nd and 7^th ones reaches about 40×10^-8m·s^-2 in about 12 months. And the surface subsidence is a continuous variation because some regional gravity values are gradually increasing. Results in the study show that gravity observation techniques can provide gravity constrain to the surface subsidence in the city and the subsidence mechanism explanation.

Key words： City surface subsidence Hybrid gravity observation Regional gravity variation D-InSAR CG-5 gravimeter

Received: 06 May 2019

PACS:	P312
	P223

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	CHEN XiaoDong
	LI Hang
	DENG MingLi
	JIANG LiMing
	SUN HePing
	LI DeWei
	ZHANG WeiMin
	HAO HongTao
	SANG Peng
	BAI Lin

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http://www.geophy.cn//EN/10.6038/cjg2020N0080 OR http://www.geophy.cn//EN/Y2020/V63/I8/2882

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