ANALYSIS OF THE APPLICATION EFFECT OF IRREGULAR EXCAVATION SUPPORT DEMOLITION TECHNOLOGY IN ADJACENT SUBWAY STATIONS
The impact of the construction of the deep and large foundation pit adjacent to the subway station on the already operational underground structure cannot be ignored.Based on the Nanjing Daming Road foundation pit project,the research and development of safety control technology for rapid removal of internal support were carried out.Numerical simulation was used to optimize and analyze the rationality of the removal plan.Through on-site monitoring data,the deformation of the surrounding structure during each stage of rapid removal of internal support in the foundation pit was analyzed Reveal the characteristics of the changes in support axial force and surrounding surface settlement.The research results indicate that using the existing enclosure structure system fully meets the safety and rationality requirements;The overall horizontal displacement of using composite pile type system for enclosure near the subway side is smaller than that of using drilled cast-in-place piles for enclosure far from the subway side;The removal of the bottom support has the greatest impact on the foundation pit enclosure structure,while the removal of the support has a greater impact on adjacent supports and a smaller impact on interval supports;The dismantling sequence has a significant impact on the foundation pit enclosure system and surrounding environment,and the research results can provide reference for similar projects.
deep and large special-shaped foundation pitsupport removaldeformation lawforce analysis
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