Lateral vertically sealing method for vacuum pre-pressed soft soil foundation
A soft soil foundation and preloading technology, applied in the field of basic engineering, can solve the problems of shallow sealing depth, poor quality controllability, difficult quality control, etc., and achieve the effect of improving the sealing effect, expanding the scope of application and easy quality control.
Inactive Publication Date: 2008-07-23
WATER TRANSPORT PLANNING & DESIGN INST
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Problems solved by technology
However, for the soft cohesive soil foundation with sand interlayer, due to the large permeability coefficient of the sand layer, when the vacuum preloading method is used for reinforcement, the free water in the pores of the sand will quickly seep and recharge to the preloaded reinforcement area under the vacuum pressure. Formation of lateral air leakage (water) channels, resulting in reinforcement failure
[0003] At present, the method of vacuum preloading for the lateral sealing of the soft soil foundation in the sand layer mainly adopts the method of forming a continuous flexible sealing wall tangentially with clay stirring piles (see Figure 1). Although this method has achieved some successful examples, due to the Due to the limitations of the process (the mixing pile is tangent to 20cm; the verticality deviation is ≤1°, and the maximum error is only 5.7m between the two piles), the sealing depth is shallow (generally 6-8m, no more than 10m), and the quality is poor. Poor controllability (the main control points are clay content, mud density, depth, verticality, lap joint, uniformity, etc., and the quality is difficult to control), and the sealing effect inspection is difficult during construction.
Due to the widespread presence of sandy soft soil formations in various regions of the world, especially in coastal shallow strata, a large number of soft soil foundation reinforcement problems are encountered in the construction of port projects. Due to the limitation of lateral sealing technology, the vacuum The application of preloading reinforcement technology in engineering construction is restricted
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[0017] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0018] As shown in Fig. 2 and Fig. 3, the lateral sealing method of the vacuum preloaded soft soil foundation comprises the following steps: leveling the site, laying the track; The sealing plastic film 1 is continuously laid into the trench; a plastic film sealing curtain is formed, and the top of the trench is backfilled with cohesive soil.
[0019] Furthermore, the upper end of the sealing film on the side seal is bonded with the ground plane sealing film to form an integral seal.
[0020] The sealing film of the present invention adopts a plastic sealing film, which meets the requirements of the purpose of the present invention in terms of cost and use effect.
[0021] The beneficial effect of the present invention will be described in detail below by taking the traditional clay mixing pile flexible sealing wall as a comparative example. ...
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The invention discloses a side vertical sealing method of a vacuum preloading soft clay foundation, comprising the following procedures: a. trenching groove; b. laying sealing film; c. forming a side vertical sealing curtain and backfilling the groove. The side vertical sealing method has the advantages of large sealing depth, favorable effect, high quality and low cost.
Description
technical field [0001] The invention relates to the technical field of foundation engineering, in particular to a lateral sealing method of vacuum preloaded soft ground. Background technique [0002] The principle of vacuum preloading soft soil foundation reinforcement is to pump air (water) to the sealed soft soil foundation through vacuum equipment to reduce the internal pressure, and use the pressure difference formed by the external natural atmospheric pressure (about 101KPa) to reduce the pressure on the soft soil foundation. A method of reinforcement. The vacuum preloading method to strengthen the soft soil foundation has the advantages of good stress stability, short reinforcement time, less material consumption, no environmental pollution, low engineering cost, and large-area simultaneous construction. However, for the soft cohesive soil foundation with sand interlayer, due to the large permeability coefficient of the sand layer, when the vacuum preloading method is...
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IPC IPC(8): E02D3/10E02D19/18
Inventor 夏玉斌刘强邓磊
Owner WATER TRANSPORT PLANNING & DESIGN INST