Positive and negative pressure combined vacuum preloading soft foundation reinforcing system and method

Abstract

The invention discloses a positive and negative pressure combined vacuum preloading soft foundation reinforcing system and method. The system comprises a vacuum water-gas separation device, a vacuum pump, a water suction pump and an air compressor, and further comprises vertical drainage plates, a main pipe and branch pipes, wherein the branch pipes communicate and gather the multiple vertical drainage plates together; the multiple branch pipes are gathered and communicate with the main pipe; the vertical drainage plates, the branch pipes and the main pipe communicate to form a pipe assembly;the pipe assembly is provided with a joint detachably connected with downstream equipment; when the detachably connected joint of the pipe assembly is connected to a water inlet of the vacuum water-gas separation device, the vacuum pump provides vacuumizing to form the negative pressure vacuum preloading soft foundation reinforcing system; and when the detachably connected joint of the pipe assembly is connected to the air compressor, the air compressor provides high-pressure gas to the pipe assembly to form a positive pressure pressurizing system. The system accelerates the soft soil foundation settlement speed, shortens the treatment period, increases the soft foundation treatment effective depth, effectively controls post-construction settlement, and achieves the excellent engineering application prospect.

Description

technical field [0001] The invention relates to the technical field of soft soil foundation treatment methods, in particular to a method for strengthening soft foundations by vacuum preloading combined with positive and negative pressures. Background technique [0002] Vacuum preloading method is an economical and effective soft soil foundation treatment technology. The method was first proposed in 1952 by Professor W. Kjellman of the Royal Swedish Institute of Geology. Due to the constraints of key technologies such as vacuum equipment, sealing materials, and vertical drainage bodies in the early stage, this method has not been well applied for a period of time. After the 1970s, with the breakthrough of the above key technical problems, the vacuum preloading method began to be widely used in soft foundation reinforcement projects, and achieved good economic and social benefits. Engineering practice shows that the vacuum preloading method has the advantages of low cost, ea...

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Problems solved by technology

However, the vacuum preloading method also has the following limitations: first, the drainage consolidation time is relatively long, the settlement rate is difficult to stabilize, and it is difficult to estimate the post-construction settlement of deep soft soil; The reinforcement effect of deep soft soil foundation is not ideal, and the treatment depth is limited

Although these joint treatment methods have made some progress, for the deep soft soil often encountered in the construction of southeast coastal projects in my country, these technologies still have limitations, mainly reflected in the rapid decay of vacuum degree along the depth and the slow consolidation rate of deep soil and high cost

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