Research on Vacuum-Surface Combined Precompression Soft Foundation Treatment Construction Technology

Research on Vacuum-Surface Combined Precompression Soft Foundation Treatment Construction Technology
The core message: China National Iron and Steel Fourth Bureau Group Co., Ltd. Chang-Chang vacuum one-load combined preloading is a new soft ground reinforcement technology developed on the basis of vacuum preloading and surcharge preloading in recent years, with vacuum preloading and Stacked preload double reinforcement effect. It has a short construction period, a fast consolidation speed, and will not cause subgrade due to the high filling speed.

The combined preloading of the first-generation vacuum stack of China Railway Siban Group Co., Ltd. is a new soft soil foundation reinforcement technology developed on the basis of vacuum preloading and surcharge preloading in recent years. It has vacuum preloading and preloading. Double reinforcement effect. It has the advantages of short construction period, fast consolidation speed, no loss of roadbed due to fast filling, clean sanitation and less environmental pollution.

Vacuum pile-up combined precompression reinforcement soft soil foundation is under vacuum one-load combined preload, pore water in soil is under the action of hydraulic gradient, along the vertical drainage body) plastic drainage plate * arrives at the lateral drainage body) The layer* is then pumped away by the vacuum pumping system, the pore water pressure is reduced, and the effective stress is increased, thereby consolidating the soil.

Process flow and operating points Vacuum combined surcharge preloading process Vacuum one-stage combined preloading Reinforcement of soft foundation construction mainly includes vertical drainage body (plastic drainage plate) erection, horizontal drainage body) sand cushion layer paving, vacuum tube Net laid, laying of geotextiles and sealing membranes, trench excavation and backfilling, installation of vacuum pumps, and vacuuming.

Before construction, ditches to diverge the surface water within the scope of construction, clear the trees above the ground above the ground, concrete, stone, rubbish, building foundations, etc., to eliminate hidden dangers or obstacles that may affect the project quality, safety, and test results.

2.3.1 Horizontal Drainage System' Sand cushion (construction survey line: According to the geometric dimension of the test section, a professional surveying engineer uses a theodolite and a level meter to measure and release the sand filling range, and pegs are used every 20 m along the central axis direction of the reinforcement zone. Set the sign and mark the elevation.

Paving under the sand film layer: fill it in two layers, and use a bulldozer to press the pile in a certain direction. Weigong Gong Anfei Vacuum Surcharge Combining Pre-Pressure Soft Foundation Treatment Shiji Foundation Research Foundation and Foundation Foundation

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