近年来上海市市区的地面沉降特征研究

地面沉降已成为上海市一种主要的地质灾害,对经济发展和城市建设具有很大的制约性.本文通过对上海市近年来(1986-2002年)地面沉降资料分析研究,探讨了上海市地面沉降的特征及规律、影响因素,得出近年来上海市的地面沉降主要有以下特点:(1)地面沉降的发展速率自1 986年以来呈现为逐渐增大的趋势,并具有非线性变化的特征;(2)地面沉降具有较好的继承性发展特征,其影响空间随着变形速率的增大而不断地扩展;(3)地面沉降在空间上的差异性显著.影响因素主要为地下水的开采和近年来大规模的城市建设.

A Study of the Features of the Land Subsidence in Shanghai Urban Area in Recent Years

In Shanghai the land subsidence has been a major geological calamity which has greatly restricted the economic development and the urban construction. Based on the subsiding data obtained in recent years (1986-2002), this paper probes the features, the usual modes, and the affecting factors, and sums up the following main characteristics: (1) the land subsidence velocity since 1986 shows a trend of increase, and possesses a trait of non-linear change; (2) the land subsidence also possesses a feature of successive development, and the area affected may expand gradually with the change of the speed; (3) the difference of the land subsidence in different areas is remarkable. The affecting factors include the exploitation of the ground water and the large-scale urban construction in recent years.