A Sandless Vacuum Preloading Soft Soil Foundation Reinforcement Method

Abstract

The invention discloses a method of strengthening a non-sand vacuum preloading soft soil foundation. The method comprises the following steps that the soft soil foundation is strengthened through two phases, wherein the first phase is shallow strata pre-strengthening treatment, and when the carrying capacity of the shallow strata reaches a set value, deep-strata long-plate vacuum preloading strengthening treatment in the second phase is carried out. According to the method, with arrangement of long and short water drainage plates and first and second vacuum pipe networks, vacuum negative pressure is directly transferred to the depth of the soft soil foundation through the vacuum pipe networks and the long and short water drainage plates without sands, so that the soft foundation treatment effect is improved, extended range loss of the vacuum negative pressure caused by viscosity resistance of sands on a water flow is prevented, and the vacuum preloading strengthening effect is improved; and in addition, the shallow strata is vacuumized firstly, and then the deep strata is vacuumized, so that the vacuumizing effect of the deep soft soil foundation is ensured, the vacuumizing speed of the deep soft soil foundation is also accelerated, the design is reasonable, and the operation is convenient.

Description

technical field [0001] The invention relates to a soft soil foundation treatment construction technology, in particular to a sandless vacuum preloading soft soil foundation reinforcement method. Background technique [0002] The traditional vacuum preloading method is to first lay a sand cushion on the surface of the soft ground that needs to be reinforced, then bury the vertical drainage pipe, and then use an airtight sealing film to isolate it from the atmosphere, and the end of the sealing film is buried for pressure treatment. The water suction pipeline buried in the sand cushion is vacuumed by vacuum pump or other vacuum means to form negative pressure under the membrane. [0003] However, with the strengthening of environmental protection awareness, the supply of sand is gradually decreasing, the price of sand remains high, and the cost of traditional vacuum preloading increases. In addition, the water in the sludge enters the sand layer through the drainage board, and...

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Problems solved by technology

[0003] However, with the strengthening of environmental protection awareness, the supply of sand is gradually decreasing, the price of sand remains high, and the cost of traditional vacuum preloading increases. In addition, the water in the sludge enters the sand layer through the drainage board, and flows into the filter layer in the sand layer. In this process, the sand produces viscous resistance to the water flow, which leads to the loss of vacuum negative pressure, which reduces the effect of vacuum preloading on soft soil foundation. In addition, because the vacuum is located on the sand cushion, it is difficult to ensure the vacuum depth

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