Disturbance compaction method for natural sedimentary soft clay foundations

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...

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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.

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