Introduction of quicksand foundation treatment?

When it comes to quicksand foundation treatment, the relevant architects are still relatively unfamiliar. Suppose the construction enterprise encounters quicksand foundation, what should be done? What is the basic profile? The following is the basic content of quicksand foundation treatment provided by Zhong Da Consulting Company for architects. The specific content is as follows:

Zhong Da Consulting compiled the basic situation of quicksand foundation treatment through the knowledge of architectural knowledge column of this website, and the basic situation is as follows:

When it comes to quicksand foundation, many construction enterprises have a headache. How to treat quicksand foundation? Zhong Da Consulting combed the relevant contents, the main contents are as follows:

First of all, we first analyze the reasons for the formation of quicksand foundation:

The formation of quicksand is varied. The main reason is that the sand layer formed by river alluvial has undergone geological changes. In the case of water flow, the whole sand layer flows, thus forming a quicksand layer. There are also quicksand beds along the Yangtze River, parts along the Huaihe River and Dangshan and Xiaoxian counties in our province. Quicksand, as its name implies, is quicksand, mainly because sand meets water underground. When the water pressure changes, the water flows, so the sand flows with it. In general, the pressure of groundwater is constant, but once the water pressure changes, the whole sand layer will change with it, so it is of great significance to deal with quicksand for foundation construction. Correctly handling the negative influence of quicksand layer in foundation construction can not only effectively control the project cost, but also improve the construction technology level.

Secondly, let's understand the hazards of quicksand foundation:

Foundation is a very important part of the building, which has a great influence on the safety and normal use of the building. In the actual construction process, the superstructure and foundation must be comprehensively considered in combination with engineering geological conditions, building materials, construction technology and other factors, so as to make the foundation project safe, reliable, economical and reasonable, advanced in technology and convenient in construction. In the process of foundation construction, if this problem is not solved, the foundation will move with the flow of sand layer, which will change the bearing layer of the foundation, which is very harmful to the building and is absolutely not allowed to happen.

Finally, we need to make clear provisions on quicksand foundation treatment, and the main treatment contents include:

The treatment of quicksand foundation is mainly to eliminate, reduce or balance the hydrodynamic pressure, and the specific measures are as follows:

(1) Construction in dry season-construction in dry season to reduce the water level difference inside and outside the pit. It can be considered when the construction period is not tight and the difference between high and low water levels is large.

(2) Driving the sheet pile: driving the sheet pile to a certain depth at the bottom of the pit to increase the distance of groundwater flowing into the pit from the outside, thereby reducing the hydraulic gradient, reducing the hydrodynamic pressure and preventing the occurrence of quicksand. It is a common construction method in engineering.

(3) Underwater excavation —— Undrained underwater excavation is adopted to balance the water pressure inside and outside the pit, so that there is no quicksand condition. This method is generally used for deep well excavation. Commonly used in river and lake construction.

(4) Diaphragm Wall Method-Construction of Diaphragm Wall for bearing and protecting the wall, and cutting off the water source and preventing the occurrence of quicksand. The cost of this method is slightly higher.

⑤ artificially lowering groundwater level —— artificially lowering groundwater level through light well points, jet well points, tube well points and deep well pump points for earthwork construction, so as to make the hydrodynamic pressure downward and increase the power between soil particles, thus effectively preventing the occurrence of quicksand.

⑤ Throwing large stones to speed up the construction-an emergency construction method in case of quicksand.

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