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山东沿海滩涂地区某联排高级住宅,采用梁板式筏板基础,持力层为强夯后的杂填土层,厚3.5～5.0 m,其下为3.0 m左右的淤泥质土层,形成上硬下软的双层地基。该建筑物刚施工完毕即产生较大沉降和不均匀沉降。从地质条件、地基处理措施、设计与施工方面对沉降原因进行分析,并将沉降计算结果与实测结果进行对比,得出该工程沉降的经验系数。为控制施工后沉降与不均匀沉降的进一步发展,采用微型桩作为减沉桩。通过筏板基础和减沉疏桩基础两种方案的沉降计算结果对比,说明加固方案的有效性。该地基加固完成后两周内变形趋于稳定,达到预期效果。
In Shandong coastal tidal flat area, a row of high-class residential houses are constructed with beam-plate raft foundation. The holding layer is a compacted stratum with a thickness of 3.5-5.0 m and a muddy soil layer of about 3.0 m underneath, forming a Hard and soft double foundation. The building just finished construction has a greater settlement and uneven settlement. The causes of settlement are analyzed from geological conditions, foundation treatment measures, design and construction, and the settlement calculation results are compared with the measured results to get the empirical coefficient of the settlement. In order to control the settlement after construction and the further development of uneven settlement, micro-pile is used as sinking pile. Through the comparison of settlement calculation results of two schemes of raft foundation and settlement reducing pile foundation, the effectiveness of reinforcement scheme is illustrated. The deformation stabilized within two weeks after the completion of the foundation to achieve the desired results.