Method for pile-loading consolidation of foundation by combining vacuum preloading with geomembrane bag device

Abstract

The invention relates to a method for pile-loading consolidation of a foundation by combining vacuum preloading with a geomembrane bag device, which comprises the following steps: excavating a sludge pool, filling the sludge pool with sludge, carrying out vacuum preloading pumping drainage for multiple times, paving the geomembrane bag device above a soft mud layer subjected to vacuum preloading pumping drainage treatment in the sludge pool to form a plurality of pile-loading layers, and carrying out pile-loading consolidation on the geomembrane bag device. The geomembrane bag device adopts geomembrane bag stacking arrangement, and the adverse effect caused by slag stacking is solved by adopting the geomembrane bag stacking aiming at the problems that the entering problem is complex and differential settlement can be generated after treatment due to the fact that slag stacking is adopted in traditional vacuum preloading. The drainage system and the geomembrane bag device are arranged in an up-and-down layered mode, the respective performance is fully played, the vacuum degree transmission effect in the whole soil body is better, the drainage rate is higher, the settling volume is larger, the geomembrane bag device can also be directly used as a solid filling material, the problem of insufficient elevation in engineering is solved, and the construction efficiency is improved. The time cost and the economic cost are saved. The invention further relates to a method for consolidating the foundation through combination of vacuum preloading and preloading.

Description

technical field [0001] The invention relates to a method for stacking and reinforcing a foundation with a vacuum preloading combined geomembrane bag device. Background technique [0002] With the rapid economic and social development in the eastern coastal areas of my country, the population density has increased sharply, and the demand for land resources and environment has become increasingly urgent. Therefore, tidal flat reclamation has gradually become an important means of land resource development in my country and the world. General silt includes dredging silt, dredging silt and engineering waste mud. This kind of silt has high moisture content, high compressibility, low strength, and the soil is in a flowing and suspended state. To meet the requirements of engineering construction for foundation strength and deformation, resulting in frequent engineering accidents. [0003] Aiming at the complex entry problem caused by slag loading in traditional vacuum preloading a...

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Problems solved by technology

An existing geomembrane bag treatment method is widely used and can be directly used for stacking above the engineering treatment sludge tank. The geomembrane bag is a large-scale film bag and inclusion made of high-strength geotextile, and its diameter can be Depending on the needs, geomembrane bags were initially used for embankment projects, and then gradually applied in environmental protection, agriculture and other fields. At present, they are also used in some sludge treatment projects, but ordinary geomembrane bags have some inherent advantages in dealing with pipeline sludge and dredging sludge. Disadvantages: First of all, only relying on the natural deposition of silt and the stacking of geomembrane bags for drainage, the cycle is one to two months, the speed is too slow, and the dehydration effect is not obvious enough, which will have a certain impact on the construction period, and also increase the invisible Certain time cost and economic cost, so it cannot be used in tense and complex foundation reinforcement projects; secondly, only by stacking and squeezing the geomembrane bag itself, the discharged water is turbid and cannot be reused. centralized processing

[0004] Furthermore, in the process of foundation reinforcement, due to the large loss of vacuum degree along the depth and low transfer efficiency of the traditional vacuum preloading method, the effect of deep soil treatment is poor, and the bearing capacity of the foundation is low.

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