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青岛地区属于典型的“土岩组合”二元地层,为研究此类特殊地层下地铁深基坑开挖引起的地表变形问题,通过现场大量实测数据,建立了研究区域内土岩二元地质条件下的18个基坑工程案例数据库,数据库内容涵盖基坑几何尺寸、围护结构形式、岩土二元地层厚度、各类变形监测数据。将围护结构形式提炼为灌注桩嵌入基底(嵌岩桩基坑)和灌注桩未嵌入基底(吊脚桩基坑)两类。基坑变形监测设地表沉降观测点177组,共得到735个有效测点。在此基础上,通过地表最终变形、地表最大沉降、地表沉降空间分布研究了土岩组合地层地铁深基坑地表变形规律。
In order to study the surface deformation caused by the excavation of deep foundation pit under such special stratum, Qingdao area belongs to the typical “earth-rock combination” binary formation. Based on a large amount of measured data in the field, Geological conditions of the 18 foundation pit engineering case database, the database covers the foundation pit geometry, envelope structure, geotechnical duality formation thickness, various types of deformation monitoring data. The envelope structure is extracted into two types of embedded piles (embedded rock piles) and embedded piles (suspended piles). Deformation monitoring of foundation pit Set 177 observation points of surface settlement, a total of 735 effective measurement points were obtained. On this basis, the surface deformation of deep foundation pit of subway-rock stratum is studied by the final deformation of the earth’s surface, the maximum settlement of the earth’s surface and the spatial distribution of the surface subsidence.