浙江宁波工程性地面沉降特征与风险区划

Characteristic analysis and risk zoning of engineering land subsidence in Ningbo city

大规模工程建设活动替代地下水不合理开采,成为软土地区地面沉降新的影响因素。本文从地面沉降发展历程、第一软土层沉降比、地面沉降与建筑容积率的对应关系、基坑周边实测沉降数据入手,初步探讨了工程性地面沉降的特征规律。综合考虑累积沉降量、沉降速率、第一软土层厚度、建筑容积率等因素,开展地面沉降管理危险性、风险性区划研究。结合地面沉降管理区划结果,从技术管理和行政管理角度,提出防控工程性地面沉降的具体措施。

Large scale engineering construction activities instead of unreasonable exploitation of groundwater has become the new influence factor of land subsidence in soft soil area. According to the development of land subsidence,the settlement ratio of first soft soil,the corresponding relationship between land subsidence and building density and the settlement data measured around foundation pit,the paper preminarily discusses the characteristics of engineering land subsidence. Comprehensive considering the amount of accumulated subsindence,subsidence rate,the thickness of first soft soil layer and the building volume rate,the paper studies the hazard zonation and the risk zonation of land subsidence management. Combined with the division results of land subsidence management,the paper puts forward some concrete measures for the prevention of engineering land subsidence from the technology and the administration.