Equipment for strengthening deep soft soil foundation by vacuum preloading of filter well and method

Abstract

The invention belongs to the technical field of foundation treatment of geotechnical engineering and provides equipment for strengthening a deep soft soil foundation by vacuum preloading of a filter well and a method. The equipment comprises the filter well, a vacuum device, a sealing structure, a grouting device and a connecting pipeline, wherein the vacuum device is connected to the upper end of the filter well through the connecting pipeline; the sealing structure is used for ensuring sealing of the whole equipment during vacuum preloading operation; the filter well is formed by combining a sand well and a vacuum pipe; the vacuum pipe is formed in the middle part of the sand well and is composed of a plurality of sections of PVC pipes and a plurality of sections of filter pipes; and the grouting device is used for filling cement-clay grout into a pore of the filter well by the vacuum pipe of the filter well to form a cement mortar pile after vacuum preloading is finished. The equipment can reduce the route loss of the vacuum degree of the filter well to make the vacuum degree of the whole section of the filter well keep a high value, so that the whole strengthening effect of the deep soft soil foundation is ensured; and meanwhile, cement mortar is poured into the sand well by utilizing the vacuum pipe to form a cement pile, and thus the bearing capacity of the foundation is dramatically improved.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering foundation treatment, and relates to a device and method for strengthening deep soft soil foundations, in particular to a device and method for strengthening deep soft soil foundations based on vacuum preloading of a filter well structure. Background technique [0002] The construction of marine, port, water conservancy, transportation and other projects often faces the problem of deep soft soil foundation reinforcement. At present, the vacuum preloading method is widely used in the practice of soft foundation reinforcement engineering. The vacuum preloading method is to set up drainage bodies such as vertical plastic drainage belts or sand wells in the soft foundation to be reinforced, lay a sand layer on top, and then cover the film to seal it, and pump air to make the drainage belt and sand layer in the membrane in a partial vacuum state. It is a foundation treatment method th...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of shallow reinforcement depth and limited improvement of foundation bearing capacity when vacuum preloading technology is used to deal with deep soft foundations, and to provide a method that can effectively improve the overall strength of deep soft soil foundations. New type filter well vacuum preloading equipment and method for strengthening deep and thick soft soil foundation

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