Underground diaphragm wall composite grouting method and grouting structure

Abstract

The invention relates to the field of geotechnical engineering, in particular to an underground diaphragm wall composite grouting method and grouting structure. The problems that underground diaphragm wall grouting is poor in controllability and stability, end resistance and side resistance of a wall body are improved, and local defects of a wall bottom are overcome are solved. The underground diaphragm wall composite grouting method comprises the following steps that a, a composite grouting device is installed at the bottom of a reinforcement cage of an underground diaphragm wall; b, the reinforcement cage with the composite grouting device is put down into a slotted hole; c, secondary slag removal is carried out through a middle hole of a hollow steel plate; d, open grouting is carried out on the wall bottom of the underground diaphragm wall through an open grouting pipe of the middle hole; e, then closed grouting is carried out on an expansion capsule at the bottom of the underground diaphragm wall through a closed grouting pipe, so that the expansion capsule expands to form a capsule expansion head; and f, finally, open type grouting is carried out on the outer side of the capsule expansion head at the wall bottom through an open grouting pipe, and grouting operation is ended. The underground diaphragm wall composite grouting method is particularly suitable for structures such as frame type underground diaphragm walls and anti-seepage walls with high requirements for bearing capacity and anti-seepage performance.

Description

technical field [0001] The invention relates to the field of geotechnical engineering, in particular to a compound grouting method and a grouting structure for a ground connection wall. Background technique [0002] The underground diaphragm wall structure is widely used in traffic engineering, hydropower engineering and municipal engineering fields due to its high bearing capacity, high overall rigidity, strong adaptability to complex geology, good anti-seepage performance, and safe and simple construction. Generally, the method of cementing the wall with mud is used for trenching construction. When part of the connecting wall structure is used as a vertical load-bearing structure, the end resistance and side resistance of the wall cannot be effectively exerted due to the presence of mud skin, sediment and disturbed loose soil layers at the bottom of the wall and around the wall. As an anti-seepage body, the ground connection wall has a small side resistance, which is not ...

AI Technical Summary

Problems solved by technology

When the partially connected wall structure is used as a vertical load-bearing structure, due to the presence of mud skin, sediment and disturbed loose soil layers at the bottom of the wall and around the wall, the end resistance and side resistance of the wall cannot be effectively exerted.

As an anti-seepage body, the ground connection wall has a small side resistance, which is not good for the overall stress state of the wall. At the same time, there may be defects at the bottom of the wall, which develop into seepage channels under the action of long-term water head, increasing the risk of leakage damage

Treatment by grouting can improve the boundary conditions of the wall, increase the bearing capacity, and reduce the risk of seepage. However, the current grouting method is mainly open-split grouting, which is simple and easy to implement, but its controllability is poor. Especially in deep overburden, it is difficult to control the grouting volume and grouting pressure, and the stability of grouting effect is poor

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