Study of Remedial Measures for Existing Unauthorised Basement Over-excavation Renovation Works
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摘要: 依托某既有违建地下室超挖整治工程，在查明安全隐患的基础上，充分考虑超挖地下室诱发结构失稳的不确定性、现场施工场地狭小以及工期短等不利因素，提出将临时降险与永久加固相结合的整体治理方案，综合运用排水、反压、轻质泡沫混凝土回填、高压旋喷桩地基加固以及人工挖孔桩底新增桩底承台体系等岩土与结构组合措施。结合现场监测验证了该违建地下室整治中岩土与结构组合加固措施的有效性。研究成果可为类似治理工程的设计和施工提供参考。Abstract: Comprehensive over-excavation renovation works of an unauthorized basement have been studied. Based on the identification of safety hazards and taking into full consideration the uncertainty of structural instability induced by the over-excavated basement, the small construction site and the short construction period, the overall treatment plan combining temporary risk reduction and permanent reinforcement was proposed. The combination of geotechnical and structural measures, such as drainage, backpressure, light weight foam concrete backfills, high pressure rotary pile foundation reinforcement, and the addition of a new pile bearing platform were used. Finally, the effectiveness of the combined geotechnical and structural reinforcement measures in the remediation of the unauthorized basement was verified by combining on-site monitoring. The research results can provide some reference significance for the design and construction of similar renovation works.
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