Processing method for large karst cave underground river with water gushing and structure thereof

Abstract

The invention discloses a processing method for a large karst cave underground river with water gushing. The method comprises the steps that the form and the development scale of a karst cave are proved through supplement exploration and CT physics exploration examinations; grouting tunnels in the karst cave are subjected to expanding excavation downstream; the upstream side of an end cap used for blocking the karst cave is arranged in the high and wide position of the karst cave, and the downstream side of the end cap used for blocking the karst cave is arranged in the low and narrow position of the karst cave so as to facilitate stability of a blocking body; steel tube railing piles are arranged on the downstream side of the end cap; grouting mold bags are arranged on the upstream sides of the steel tube railing piles; the upstream sides of the grouting mold bags are filled with gradating materials; the gradating materials are subjected to pre-consolidation grouting and controlled grouting; and curtain grouting is conducted along curtain lines. Under the conditions that the development scale of the karst cave is large and the underground river has rushing current with water gushing, the steel tube railing piles and the grouting mold bags are combined so that water can be blocked and a dam can be formed under the condition of the rushing current, late-stage consolidation grouting and curtain grouting are combined, and the karst cave of the type can be blocked.

Description

technical field [0001] The invention relates to the technical field of underground river treatment in water conservancy and hydropower projects, in particular to a method for treating underground rivers in large-scale karst caves accompanied by gushing water in Guizhou karst plateau landforms and a treatment structure adopted therefor. Background technique [0002] In the fengcong depression landform area of ​​Guizhou karst plateau landform, there are the most widely distributed karst depressions with different areas but the largest number. Due to the difficulty in the development and treatment of falling water streams, shafts, funnels and underground pipelines in the karst depressions, design and construction There is no uniform standard for quality, and the complex seepage field of karst was avoided as far as possible when reservoirs were built in the past. [0003] However, the construction of reservoirs in karst depressions occupies less cultivated land resources, and th...

AI Technical Summary

Problems solved by technology

The curtain grouting is arranged in a single hole, and in the karst development part, the holes can be densely drilled or double-row or multi-row curtains can be arranged according to the situation to form a water-blocking curtain. Due to the complexity of the situation, it is difficult to achieve good results by conventional drilling plugging and grouting curtains to block water and form dams. Therefore, the treatment of this type of karst caves is extremely difficult. There are no relevant reports at home and abroad, and it is a worldwide problem.

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