Dam anti-seepage high polymer directional split grouting method

Abstract

The invention discloses a dam anti-seepage high polymer directional split grouting method. The method comprises the following steps of: axially drilling grouting holes at certain intervals along a dam body by using a directional split drilling tool and a hole forming device; injecting a high polymer material into the grouting holes, wherein the high polymer material is quickly expanded after being subjected to a chemical reaction; when produced expansive force exceeds tensile strength of a soil body, splitting the soil body along a direction guided by the split drilling tool and connecting to form an ultrathin high polymer anti-seepage system so as to fulfill the aim of treating dam seepage. In the invention, the dam anti-seepage high polymer split grouting method is developed for the first time, and a new approach for constructing the dam anti-seepage system is created, so the method has the characteristics of fast construction, good anti-seepage effect, low manufacturing cost, small disturbance to a dam and the like; and the method is successfully applied to various reservoir dams and danger elimination and reinforcement projects of the dam and shows great economic and social benefits and broad development and application prospect.

Description

technical field [0001] The invention belongs to the danger-removing and reinforcing technology of water conservancy infrastructure, in particular to the directional splitting and grouting technology of anti-seepage high polymers for dikes and dams. Background technique [0002] In recent years, the safety maintenance of my country's water conservancy infrastructure construction has been highly valued by governments at all levels and widely concerned by the whole society, and the project safety situation is very severe. At present, my country has built 87,000 reservoirs of various types, the number of which ranks first in the world. But among the reservoirs that have been built, 40% of small reservoirs and 25% of large and medium reservoirs are dangerous reservoirs. Since 1954, there have been about 3,500 large and small dam failures in my country. In addition, about 280,000 kilometers of dikes have been built across the country, but a large number of dikes have various dis...

AI Technical Summary

Problems solved by technology

[0005] (1) The grouting hole is large, which will cause certain damage to the dam structure;

[0006] (2) The grouting pressure is not easy to control;

[0007] (3) The fluidity of the grout is not good, especially for places where the grouting position is deep, the grout cannot be effectively diffused;

[0008] (4) In the anti-seepage of dams, it is required to form a curtain in the direction of the dam axis, and the grout diffusion range of cement splitting grouting is not easy to control;

[0009] (5) The grouting construction time is longer;

[0010] (6) After the mud is consolidated, a brittle wall is formed in the dam body, which has a large difference in stiffness from the soil, and the deformation is uncoordinated, which is prone to cracking and damage

At present, polymer grouting technology is mainly used in foundation reinforcement and road maintenance of industrial and civil buildings, but there is no relevant report on anti-seepage high polymer directional splitting grouting technology in China

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