摘要
本文在论述无锡市地面沉降历史和形态特征的基础上,分析沉降机理和原因,并指出了控制地面沉降的具体途径。
The ground subsidence has last at least 30 years in Wuxi.Recently,the area has been over 25 Km^2.The largest two zones are nearly west-east trending Huangxiang-Lihuazhuang and nearly south- east trending Wuqiao-Chaoyang square,which are distributed in the north urban district forming a ir- regular large-sized funnel trending northwest.Therefore,the total setting range of main and secondary subsidence zones has exceeded 800 mm and 400-600 mm respectively.The main reason of subsidence is the overextraction of groundwater by the local industries for their rapid development during last decades.As a result,the grain skeleton of aquifer is compacted and the pore volume is decreased re- sulting in permanent plastic deformation.The paper suggests three measures special for the prevention of subsidence:1.to rigidly control the annual extraction of deep wells within the confines of 4.5 m^3 in the north of urban district;2.to increase artificial groundwater recharge amount from 2.1m m^3 to 2. 5m m^3;3.to confine annual extraction of groundwater and to build a waterworks in Luoshe- Qianzhou district.
出处
《江苏地质》
1991年第4期225-228,共4页
Jiangsu Geology
