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Disturbance compaction method for natural sedimentary soft clay foundations

A soil foundation and natural technology, which is applied in the reinforcement of natural sedimentary soft soil foundation and the field of high-sensitivity natural sedimentary soft clay foundation disturbance compaction method, which can solve the problems of poor stability of soil structure, instability of structures, and inconspicuous effect of foundation reinforcement. , to achieve the effect of improving reinforcement quality, improving construction efficiency, and reducing soil moisture content

Inactive Publication Date: 2015-06-24
NANJING PANYUAN ENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the existing drainage consolidation techniques are used to treat highly sensitive marine sedimentary soil foundations, the following two main engineering problems must be encountered: 1) During the long-term deposition and post-deposition process of natural sedimentary marine soil, the soil The consolidation yield pressure increases greatly under the effect of time. The consolidation yield pressure of natural sedimentary marine soil with normal consolidation history is often greater than its effective overlying pressure. When the applied load is less than the consolidation yield pressure, the deformation is very large. As a result, a considerable part of the heap load and vacuum preloading load is used to overcome the consolidation yield pressure of the natural sedimentary soil, resulting in ineffective foundation reinforcement; 2) The stability of the soil structure is poor, and the built structures are easily affected by the surrounding Instability caused by construction disturbance, traffic load, earthquake load, etc.

Method used

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  • Disturbance compaction method for natural sedimentary soft clay foundations
  • Disturbance compaction method for natural sedimentary soft clay foundations
  • Disturbance compaction method for natural sedimentary soft clay foundations

Examples

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Embodiment 1

[0020] The soft clay layer of a marine natural sedimentary soft clay foundation is about 10m thick, with an average natural water content of 82%, an average natural void ratio of 2.2, and an average liquid limit water content of 81%. The undisturbed consolidation yield pressure is 60kPa~90kPa, the undrained shear strength of the original sample ranges from 12kPa~30kPa, and the reshaped sample cannot be formed. The undrained shear strength obtained by the falling cone method is 1.4 kPa, and the sensitivity reaches 10~20. Therefore, the natural sedimentary soil foundation of the site is extremely unstable under the action of external loads. Under the influence of the external environment, the soil structure is easily disturbed, and the undrained strength is easily reduced from the original strength to the remodeling strength.

[0021] After research, the rapid disturbance compaction method with the following steps is used for compaction and reinforcement. The plane range of reinf...

Embodiment 2

[0029] Another marine natural sedimentary soft clay foundation, the thickness of the soft clay layer is about 8m, the average natural water content is 97.5%, the average natural void ratio is 2.6, the average liquid limit water content is 84.5%, the undisturbed consolidation yield pressure At 30 kPa to 60 kPa, the undrained shear strength of the original sample varies from 10 kPa to 18 kPa, and the reshaped sample cannot be formed. The undrained shear strength obtained by the falling cone method is 0.8 kPa, and the sensitivity is as high as 20 to 40. Therefore, the natural sedimentary soil foundation of the site is extremely unstable under the action of external loads. Once the disturbance intensity decreases sharply, the soil is completely disturbed into a fluid state.

[0030] Disturbance compaction method is used for compaction reinforcement treatment, and the plane range of reinforcement is 400m×50m.

[0031] Concrete steps are identical with embodiment 1. The difference is...

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Abstract

The invention relates to a disturbance compaction method for high-sensitivity natural sedimentary soft clay foundations and belongs to the technical field of building foundation treatment. According to the method, rapid disturbance and vacuum pre-compaction are combined to perform compaction treatment on high-sensitivity natural sedimentary soft clay foundations. The method comprises the steps of foundation soil rapid disturbance, drainage board insertion, pipe connection, covering and sealing and vacuum negative-pressure drainage. Firstly, an original structure of the soil mass is destroyed in advance through rapid disturbance, and secondly, negative pressure is created in soil layers to be treated through drainage boards to achieve drainage consolidation. The method is capable of improving construction efficiency and consolidation of high-sensitivity natural sedimentary soft clay foundations, simple and reliable and economic and practical.

Description

technical field [0001] The invention relates to a natural sedimentary soft soil foundation reinforcement method, in particular to a high-sensitivity natural sedimentary soft clay foundation disturbance compaction method, which belongs to the technical field of building foundation treatment. Background technique [0002] With the increasing scale of my country's infrastructure construction, most of the large buildings such as airports, docks, highways, and railways in important ports and economically developed cities are built on natural sedimentary soft clay foundations in coastal areas. Through the analysis of a large number of drilling data, some experts have clearly drawn the following conclusions: the places where the plains develop along the eastern coast of my country have basically been affected by the Quaternary transgression and regression, and the distribution of marine sediments can be from the modern coast to the inland Extending nearly 100 kilometers [Wang Pinxia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D3/10E02D3/00
Inventor 曾玲玲吉锋洪振舜李辉陈永辉
Owner NANJING PANYUAN ENG TECH
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