reinforced foundation

Abstract

The invention relates to a reinforced foundation which is characterized in that a core plate is arranged inside a deep soil body of a treated foundation; the core plate is a residual part of a partially degraded drain board; the drain board comprises the core plate inside and a filtering membrane at the periphery of the core plate; a water drainage channel is formed between the core plate and the filtering membrane; the core plate is made of a non-degradable material or a degradation-resistant material; and the filtering membrane is made of a degradable material. Along with time, the filtering membrane of the drain board inside the foundation can be rapidly degraded, after the filtering membrane is degraded, only the core plate is left inside the foundation, the space of the filtering membrane and the original drainage channel can be filled by soil inside the foundation, and thus the soil can tightly adhere to the core plate. The reinforced foundation has the advantages of simplicity in operation, low cost and good construction effect.

Description

technical field [0001] The invention relates to a treatment method for weak ground, in particular to a reinforced ground processed by a well point plastic drainage vacuum precompression seepage consolidation combined with precipitation precompression dynamic consolidation method. Background technique [0002] According to 7.1.1 of the "Code for Design of Building Foundations" (GB5007-2011), weak foundations refer to foundations mainly composed of silt, muddy soil, flushing soil, miscellaneous filling soil or other highly compressive soil layers. Before building construction on the weak foundation, it is necessary to consolidate the weak foundation first. The conventional consolidation treatment methods are as follows: [0003] 1. Conventional vacuum preloading reinforcement. Conventional vacuum preloading reinforcement "on land and under water in rivers, seas, lakes and swamps" soft soil foundations all need to be laid with sealing film and sand cushion, but there are the fo...

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Problems solved by technology

[0004] 1. The construction of large-area sealing membranes is difficult, and vacuum preloading on land requires a lot of manual laying of membranes with a low degree of mechanization, especially the construction of underwater vacuum preloading sealing membranes is more difficult;

[0005] 2. The PVC sealing film has low strength and is easy to be damaged and leak air. The cost of the second layer of sealing film and the first layer of geotextile is high, and it is difficult to find the air leakage point;

[0006] 3. A large number of PVC sealing films are not environmentally friendly;

[0007] 4. The surface under the film can reach a maximum negative pressure of 80kPa, and the negative pressure transmission loss to the deep part of the soil layer is fast. Generally, the loss of negative pressure per meter to the deep part is about 10kPa. The effective reinforcement depth is shallow;

[0008] 5. The loading surface is on the original ground surface or the backfilled land surface. Even if the surface sealing film does not leak, the slow air leakage of the shallow soil around the reinforcement area cannot be ignored, especially in the case of long-term loading for about 90 days, when the groundwater level drops to The degree of air leakage in shallow soil around a certain degree of reinforcement area is even more worrying

[0009] 2. The improved vacuum preloading reinforcement has the following disadvantages:

[0010] 1. The sand-removing cushion layer is changed to the mode of direct connection of plastic slabs with hand-shaped joints, and the mode of indirect negative pressure transmission is changed to direct negative pressure transmission mode, but it still needs a sealing film, and the maximum negative pressure loading surface is still on the surface;

[0011] 2. The sealing layer is formed by blowing and filling mud, or the vacuum branch pipe is directly connected to the plastic drain about 1.5 meters into the soil, or the vacuum filter tube is about 3 meters underground, and the side suction plastic row is about 10 days in the initial stage of vacuum preloading. Consolidation and cracking due to dehydration, groundwater level drops rapidly, and the sealing effect is greatly reduced;

[0012] 3. The ultra-soft soil for land reclamation cannot be mechanically constructed. First, artificially insert the shallow layer of plastic drainage vacuum preloading, and then do deep vacuum preloading after the foundation strength is suitable for mechanical construction. The principle and process of conventional vacuum preloading are almost the same, only the simple difference between manual and mechanical, the process is more complicated, the cost is high, and the efficiency is low;

[0018] For traditional main pipes and branch pipes, submersible pump gravity dewatering is used for tube wells, and a combination of submersible pump gravity dewatering and vacuum dewatering is used for deep well dewatering. The spacing between well points is larger, generally 15*15m. The coarse and sparse treatment method focuses on precipitation. If the spacing is too large and the time is short, it cannot simultaneously have the effect of vacuum preloading and negative pressure consolidation;

[0019] Coarse and sparse distribution of genetic precipitation and short-term (about 30 days) treatment methods in the precipitation dynamic compaction treatment are only suitable for shallow treatment;

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