DRYING FOOD PAIN - MEASURES OF WATER RESISTANT WALL

1. Introduction

For many underground constructions, it is necessary to develop basic techniques to exclude groundwater from excavations. These methods can be implemented on their own or in combination with groundwater pumping techniques.

While the company's primary focus is on pumping technology-based groundwater control techniques, a basic understanding of the water containment methods used is also required. This knowledge will be useful when comparing pumping and containment method options or when developing methods to reduce environmental impacts.

2. Principle of water-stop method

A variety of water containment techniques exist, such as forming retaining walls or barriers around excavations. Conventional measures used for groundwater control purposes are classified according to how they interact with the ground. Barriers are inserted into the soil (such as Larsen piles) thus creating waste soil. In contrast, retaining walls are excavated and replaced with materials (such as barrette walls, bored piles). Spraying methods (cement-soil piles or injecting methods) involve injecting and mixing special substances into the soil, where they coagulate to prevent groundwater infiltration in pores and cracks. cracked. Another type of water containment method is an artificial soil freezing system. The soil is frozen to form a barrier of groundwater and groundwater has very low permeability.

The choice to use a certain water containment method will depend on the conditions and constraints for a given project. The main conditions are the depth of the wall, the geological condition, the geometry of the wall (some methods can be used horizontally, inclined or vertically, while others are limited to the vertical application) and is this retaining wall permanent or temporary? long-term impacts on groundwater should be considered.

Sometimes different water containment methods are used in combination. Water containment methods can be combined to deal with specific stratification over an area.

3. Shape of retaining wall applied

The application of the water containment method, creating a physical barrier around a dug hole is described below. In some cases it is required to provide a permanent retaining structure forming the walls of a permanent basement. This will affect the choice of technique used to form retaining walls, because not all methods are suitable for structural applications.

The most common application is the installation of vertical retaining walls around excavations. However, some water containment methods, such as soil cementing, may not shape or produce different retaining wall shapes.

4. Practical methods