Method of damming ultra-fine grain and upstream method tailings to prevent earthquake liquefaction instability and damage

Abstract

The invention discloses a method for preventing earthquake liquefaction instable failure for superfine grain upstream method tailing damming. The burying depth of a first earthquake liquefaction preventing medium-coarse sand draining and seeping layer and the burying depth of a second earthquake liquefaction preventing medium-coarse sand draining and seeping layer are determined according to the earthquake fortification intensity of an earthquake of a region, wherein each of the first earthquake liquefaction preventing medium-coarse sand draining and seeping layer and the second earthquake liquefaction preventing medium-coarse sand draining and seeping layer is composed of a medium-coarse sand draining and seeping layer (11) and a row of slot draining and seeping pipes (3) laid in the medium-coarse sand draining and seeping layer (11), wherein the slot draining and seeping pipes (3) communicate with a water draining communication pipe (2) through a tee pipe (12), and the outer end of the water draining communication pipe (2) is connected with a dam abutment flood interception trench (1). By means of the method, the earthquake liquefaction preventing capability and stability of a superfine grain tailing fill dam are improved, the bearing force and the liquefaction preventing capability of superfine grain tailings are improved, earthquake liquefaction subsidence of a superfine grain tailing fill dam foundation is eliminated, the earthquake liquefaction instable failure phenomenon is avoided, and stability of the superfine grain tailing fill dam is improved.

Description

technical field [0001] The invention belongs to fine-grained tailings dam-building technology, and specifically relates to a method of how to prevent earthquake liquefaction instability and damage by adopting an upstream method for ultra-fine-grained tailings. Mine dams are especially applicable. Background technique [0002] At present, there are more than 150 kinds of minerals discovered in our country, and more than 10,000 mines have been built. The accumulated tailings have produced more than 10 billion tons, and the annual growth rate is still more than 1 billion tons. The tailings disposal method is still based on the ground stockpiling of tailings ponds. The number of tailings ponds currently counted exceeds 12,000, and more than 90% of them use the upstream method of damming. [0003] Tailings dam is a special geotechnical structure. Its dam construction materials, construction technology, construction period, service function, static and dynamic characteristics, da...

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Problems solved by technology

[0010] (2) The smaller the uneven coefficient of fine-grained tailings, the poorer the liquefaction resistance;

However, it is also pointed out that the research on the seismic design of tailings dams is still one of the important topics in geotechnical engineering and earthquake engineering. The previous research has made great progress, but due to its complexity, there are still many problems worth exploring from theory to engineering application.

Moreover, this paper does not propose a specific solution for how to prevent earthquake liquefaction instability and damage in ultra-fine tailings using upstream tailings dam construction.

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