Soft base processing method

A technology for soft foundation and soft soil foundation, which can be used in infrastructure engineering, soil protection, sheet pile walls, etc., and can solve the problems of high cost and long construction period of deep cement-soil mixing piles.

Inactive Publication Date: 2008-07-16
TONGJI UNIV
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Problems solved by technology

[0006] Aiming at solving the problems of too long construction period and high cost of simply adopting deep cement-soil mixing piles in the treatment of expressway deep and thick soft foundations (thickness greater than 10m), the purpose of the present invention is to provide a long-term Combined treatment method of plastic drainage board (or sand well) and short cement-soil mixing pile (referred to as long board-short pile construction method, also referred to as D-M construction method)

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Embodiment Construction

[0067] In order to verify the effectiveness of the above method, the results of actual in-situ measurement and field observation of settlement were evaluated.

[0068] 1. In-situ test results of the shallow foundation during the filling period

[0069] The subgrade construction test section of the test section is located at K97+461~K97+561 of the fourteenth contract section of the Yancheng section of the Huaiyan Expressway. The test section is divided into four sections from east to west. The geogrid section (only plastic drainage board 17.5 m), long slab and short pile joint treatment section B (long slab 17.5m combined with 8m short pile, pile distance 1.6m), long slab short pile joint treatment section A (long slab 17.5m combined with 8m short pile, pile distance 1.4 m), there is a conventional section (pure mixing pile, pile length 17.5m) on the west side of the joint treatment section. From October 10, 2003 to the end of May 2004, a total of 15 layered soil fillings were...

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Abstract

The invention relates to a method for adopting long plastic drainage plate (or sand drain) and short cement-soil mixing pile in connection to deal with highway soft foundation (abbr. a long plate-short pile working method, or called a D-M working method). Compared with the single prepressing drainage method, such method has the advantages of effectively raising the stability of foundation effectively and accelerating the construction of road embankment owing to the existence of a short pile, thus shortening the constructing period correspondingly. Compared with a single deep mixing pile, the method can accelerate the consolidation settlement of deep soft soil owing to the existence of a long plate; therefore, the settlement after working is controlled in a certain range; besides, the coordination of settlement speed rates among different sections becomes possible by adjusting the space, the length and the prepressing style between the pile and the plate.

Description

technical field [0001] The invention relates to the field of highway roadbed construction engineering, in particular to a processing method for expressway soft roadbeds. Background technique [0002] Expressway is a large linear structure, which has strict requirements on post-construction settlement and settlement difference of different road sections. Expressways generally cross different landform units, and will encounter various foundation conditions along the line. Deep soft soil strata are widely developed in the Yangtze River Delta, Pearl River Delta and other coastal areas of my country. Due to the high embankment and heavy load, the reinforcement treatment of these deep soft soil foundations is one of the technical difficulties in the construction of roads or expressways in soft soil areas. [0003] During the construction of expressways in our country, according to years of construction experience, a set of soft soil foundation treatment technology system suitable...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D3/00E02D5/46E02D3/10
Inventor 叶观宝徐超高彦斌邢皓枫白航赵鸿钧
Owner TONGJI UNIV
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