Shallow poor subsoil composite foundation stabilization treatment method

A technology of composite foundation and treatment method, which is applied in the field of deep soft soil layer and shallow layer composite foundation treatment, can solve the problem that the treatment method of large-scale soft foundation cannot fully meet the requirements, construction machinery is cumbersome to enter the field, and the depth of the pile body is too deep, etc. problems, to achieve the effect of fast construction speed, miniaturization of construction equipment, and reduction of post-construction settlement

Inactive Publication Date: 2012-04-25
GUANGDONG PROVINCIAL CHANGDA HIGHWAY ENG
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Problems solved by technology

[0005] According to the characteristics of the soft soil foundation in small sites, the large-scale soft foundation treatment method cannot fully meet the requirements, and the pile body is too deep into the soil (generally penetrates the soft soil layer), the pile diameter is large (600-1000mm), and heavy construction machinery is difficult to enter the site. , the construction process is complicated, and the cost is relatively high. Therefore, the composite foundation reinforcement treatment for the weak foundation of the small site has certain disadvantages in the construction method of the composite foundation.

Method used

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  • Shallow poor subsoil composite foundation stabilization treatment method
  • Shallow poor subsoil composite foundation stabilization treatment method
  • Shallow poor subsoil composite foundation stabilization treatment method

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Embodiment 1

[0027] As shown in Figure 1, the geotechnical pipe bag laying steps: (1) as Figure 1a , use Luoyang shovel to form the hole, the hole forming standard: diameter Φ120mm, depth 4m, pile spacing 0.6m, triangular arrangement; (2) such as Figure 1b , Use the drill pipe to send the closed end of the geotechnical pipe bag with a diameter of 180mm and a length of 4.5m to the bottom of the hole.

[0028] The preparation steps of lime-mixed clay mixed filling material are as follows: (1) Select fresh block ash, water it for pre-digestion and pass it through a 5mm sieve; mix clay with clay excavated in situ, clay particles ≤ 15mm, remove visible organic matter cohesive soil (2) Lime and clay are mixed evenly in the mixing equipment according to the designed lime-soil ratio, and the amount of quicklime added is 8%.

[0029] Such as Figure 1c and Figure 1d , The construction steps of compaction and compaction are: after mixing evenly, the lime soil filler is filled in layers along th...

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Abstract

The invention relates to a shallow poor subsoil composite foundation stabilization treatment method, which comprises: firstly, digging a hole with a diameter of 100 to 130 millimeters and a depth of 4 to 15 meters, and keeping an inter-pile distance between 800 an 1,000 millimeters; secondly, inserting an earthwork pipe bag, which has a diameter of 150 to 180 millimeters, the same length as the hole and a sealed bottom end, into the hole; preparing a lime-clay mixed filler; filling the mixed filler to the bottom of the earthwork pipe bag, ramming the filler layer by layer to a limited density; and curing the filler in the air naturally, forming shallow bagged and compacted lime piles with a small diameter with the mixed material, laying a 400 to 600 millimeter coarse soil cushion layer onthe ground surface of the stabilized area, and rolling the cushion layer with a small mill till the cushion layer is dense. The method can effectively reduce engineering cost, simplify construction working procedures and meet construction requirements.

Description

technical field [0001] The invention relates to a shallow composite foundation treatment method, in particular to a method for treating deep and thick soft soil layers such as collapsible loess, plain fill, miscellaneous fill and soft clay, and belongs to the field of geotechnical engineering. Background technique [0002] Collapsible loess is a kind of clayey soil mainly composed of silt, porous, low natural water content, yellow or brownish-yellow. There are two types of subsidence and non-self-weight subsidence. The collapsible characteristic of loess is the main factor causing damage to site buildings and roads. [0003] Soft soil foundation has the characteristics of high natural water content, large void ratio, high compressibility, low shear strength, small consolidation coefficient, poor water permeability, complex layered distribution, and large difference in physical and mechanical properties between layers. The bearing capacity is generally very low, and the ove...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D3/08
Inventor 林才奎徐一鸣方建勤杨红军吴章华夏兼
Owner GUANGDONG PROVINCIAL CHANGDA HIGHWAY ENG
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