A method for preventing earthquake liquefaction instability of ultra-fine tailings piled upstream tailings dam

Abstract

The invention discloses a method for preventing earthquake liquefaction instability of an ultrafine tailing heaping upstream method tailing dam. An initial dam (5) and a dam abutment flood stop ditch (1) are built according to a design scheme; embedment depths of a first earthquake liquefaction resisting medium-coarse sand drainage / seepage layer and a second earthquake liquefaction resisting medium-coarse sand drainage / seepage layer are determined according to the region seismic fortification intensity; the first and second earthquake liquefaction resisting medium-coarse sand drainage / seepage layers both consist of medium-coarse sand drainage / seepage layers (11), and a row of groove hole drainage / seepage pipes (3) paved in the medium-coarse sand drainage / seepage layers (11); the groove hole drainage / seepage pipes (3) are communicated with drainage communicating pipes (2) through three-way pipes (12); and the outer ends of the drainage communicating pipes (2) are connected with the dam abutment flood stop ditch (1). The method improves the earthquake liquefaction resistance and the stability of the ultrafine tailing heaping dam, prevents the earthquake liquefaction instability damage, and in particular, is suitable for the ultrafine tailing heaping upstream method tailing dam in high-intensity earthquake region.

Description

technical field [0001] The invention belongs to fine-grained tailings dam-building technology, and specifically relates to a method for preventing earthquake liquefaction instability and damage in the upstream method stacking dam scheme for ultra-fine-grained tailings with a content of -200 mesh exceeding 80%, and is especially suitable for super-fine-grained tailings in high-intensity earthquake areas. Fine-grained tailings are piled up to build upstream tailings dams. 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] The tai...

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Problems solved by technology

[0013] The purpose of the present invention is to solve the problem of earthquake liquefaction, instability and damage in the tailings stockpile of the upstream tailings stockpile of fine grains, especially superfine tailings, and propose a tailings dam that prevents the stacking of ultrafine tailings upstream tailings dam Earthquake liquefaction instability method to improve the stability of fine-grained tailings stacked tailings reservoir dam

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