Construction method for foundation pit supporting by dynamic compaction replacement of muddy soil

Abstract

The invention discloses a construction method for foundation pit supporting by dynamic compaction replacement of muddy soil, which includes the steps: performing pre-dewatering in a pit before excavation of the foundation pit according to a designed elevation; performing natural sloping according to a certain proportion, excavating to a first preset elevation, confirming tamping settlement and area of tamped corrected land, and locating and paying off a line according to the design requirements; distributing spots one or two times of the rammer base diameter in a foundation base stress range to confirm compacting spots, and controlling spot distribution among foundation bases in the range of land reinforcement and expanded compaction according to land photometric conditions and structural design requirements, eight to twelve times of the rammer base diameter. The construction method is suitable for coastal shoals with upper backfill soil and lower muddy soil poor in stability. By the construction method, supporting efficiency is improved greatly, construction is simpler, operation is easy, construction cost is saved, procedures of the method compared with the traditional supporting process are reduced, construction period is shortened, and cost is reduced.

Description

technical field [0001] The invention relates to the technical field of building foundations, in particular to a foundation pit support construction method for dynamic compaction replacement of muddy soil, which is suitable for the excavation engineering construction of deep foundation pits in which the lower soil layer is muddy soil. Background technique [0002] In the excavation and support engineering of deep foundation pits in the coastal shoal area, the traditional support methods include: soil nail wall support structure, row pile filling pile support structure, underground diaphragm wall structure, etc. The main problems: in construction engineering Among them, the support problem of foundation pit excavation has always been a complicated project, especially in coastal shoal area, the upper soil layer is backfill soil, the lower soil layer is silt soft soil, and the soil quality is poor. The maintenance process will increase many processes, thereby prolonging the cons...

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Problems solved by technology

[0002] In the excavation and support engineering of deep foundation pits in the coastal shoal area, the traditional support methods include: soil nail wall support structure, row pile filling pile support structure, underground diaphragm wall structure, etc. The main problems: in construction engineering Among them, the support problem of foundation pit excavation has always been a complicated project, especially in coastal shoal area, the upper soil layer is backfill soil, the lower soil layer is silt soft soil, and the soil quality is poor. The maintenance process will increase many processes, thus prolonging the construction period and increasing the cost

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