Vacuumizing-electroosmosis-stacking combined soft-foundation consolidating system and method

Abstract

A vacuumizing-electroosmosis-stacking combined soft-foundation consolidating system consists of telescopic water drainage electrodes, a conductive circuit, a direct-current power supply, horizontal water drainage pipes and a vacuum pump, wherein the water drainage electrodes, the conductive circuit and the horizontal drainage pipes are all arranged below a vacuum film, and the telescopic water drainage electrodes with telescopic upper ends are capable of being powered on and draining water. A vacuumizing-electroosmosis-stacking combined soft-foundation consolidating method includes the technical steps of arranging plastic water drainage plates and the water drainage electrodes, connecting the horizontal water drainage pipes and leads, paving geotextile, performing vacuumizing, electroosmosis and stacking preloading, and compressing the water drainage electrodes and the like. By the vacuumizing-electroosmosis-stacking combined soft-foundation consolidating system, the difficult problem of combination of electroosmosis, vacuum preloading and stacking preloading is solved, and three foundation treatment methods of electroosmosis, vacuum preloading and stacking preloading are combined so that the vacuumizing-electroosmosis-stacking combined soft-foundation consolidating method is particularly suitable for silt-based soft foundation with low osmotic coefficient and capable of shortening foundation treatment period and improving treatment effect greatly and is an economic and practical soft-foundation treatment method.

Description

technical field [0001] The invention belongs to the technical field of foundation treatment, and in particular relates to a vacuum-electroosmosis-surcharge combined reinforcement system and method for soft foundations. Background technique [0002] The combined use of vacuum preloading and electroosmotic drainage is a new soft foundation reinforcement technology developed in recent years. The common method is to first carry out vacuum preloading to discharge the free water in the soft foundation, and then carry out electroosmosis to forcefully reduce the soil moisture content, so as to create conditions for dynamic compaction or vibration rolling. The disadvantages of this approach are: [0003] (1) Vacuum preloading and electroosmosis cannot be carried out at the same time, and there is no real organic combination. Vacuum preloading can only discharge the free water in the soil, but can do nothing to the bound water. Although electroosmosis can act on the bound water of ...

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Problems solved by technology

Although electroosmosis can act on the bound water of the soil, it has no compaction effect on the soil, and because there is no vacuum film covering, it is difficult to prevent rainwater recharge during the electroosmosis process

[0004] (2) After the electroosmotic treatment, dynamic compaction is required, and the construction cost of dynamic compaction is high, and rubbery soil is prone to occur

[0005] (3) A variety of processing methods are carried out in turn rather than at the same time, so the construction period is longer

[0007] (1) Since the electrodes, conductive lines and drainage pipes are all on the vacuum membrane, it is impossible to cover the vacuum membrane with water or pile up soil for preloading. If further processing is required, the electroosmotic system must be dismantled

[0008] (2) The integrity of the vacuum membrane cannot be maintained, and the electrode tube is prone to air leakage at the outlet of the membrane, and when the foundation settlement is large, it is easy to tear the vacuum membrane at the outlet

[0009] (3) The site after vacuum combined electroosmosis treatment often needs further dynamic compaction treatment, which has high cost and long construction period

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