Preprocessing method of landslide dam diaphragm wall grooving construction

Abstract

The invention discloses a preprocessing method of landslide dam diaphragm wall grooving construction. The preprocessing method of landslide dam diaphragm wall grooving construction comprises the stepsof drilling a row of blast holes at intervals on a landslide dam diaphragm wall axis; after completing the drilling of the blast holes, blasting lonestones encountered in the blast holes, and conveniently crushing the lonestones into rock blocks; after the lonestones are crushed into the rock blocks, drilling a row of upstream grouting holes and a row of downstream grouting holes at intervals onthe upstream and the downstream of the landslide dam diaphragm wall axis; after completing the drilling of the upstream grouting holes and the downstream grouting holes, grouting the grouting holes, and blocking leakage channels on the upstream and the downstream of the landslide dam diaphragm wall axis, so that grooving construction of the landslide dam diaphragm wall is conveniently carried outunder the conditions with a complete and stable stratum. According to the method provided by the invention, the geological conditions with more lonestones, a severe overhead phenomenon, a non-deposited and non-cemented stratum can be improved for a landslide dam, so that diaphragm wall construction can be favorably carried out on the stratum in the follow-up process.

Description

technical field [0001] The invention relates to the field of water conservancy and hydropower engineering, in particular to a pretreatment method for groove-forming construction of an anti-seepage wall of a dam body. Background technique [0002] The barrier body was formed by earthquake collapse and landslides. Since the improvement of the barrier lake is imminent, the improvement of the barrier body needs to adhere to the working idea of ​​research, design, and treatment at the same time. It is necessary to carry out the implementation of risk reduction and flood control projects such as barrier body improvement as soon as possible. The damming body improvement is to carry out anti-seepage treatment and partial slope surface improvement on the damming body, weir foundation and bank slopes on both sides. The anti-seepage treatment of the damming body adopts the combination of anti-seepage wall and curtain grouting. [0003] For the damming body, previous engineering experie...

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Problems solved by technology

[0003] For the damming body, previous engineering experience mainly focused on dismantling and diverting water flow. However, for a damming body with a huge volume formed by a super-large collapse, the cost of demolition is very high, and it is difficult to find it near the project site. There are so many accumulations in a suitable site, so if we can make full use of the dams and directly use the dams to form the dam, it will eliminate harm and bring benefits, and turn waste into treasure.

However, for the geology of the dam body where the maximum depth of the cut-off wall exceeds 130m, the thickness of the wall exceeds 1.0m, and the boulder content exceeds 50%, the maximum particle size of the boulder exceeds 15 meters, the overhead phenomenon is serious, and the stratum has not been deposited and cemented. In terms of conditions, these unfavorable conditions have caused great difficulties in the construction of cut-off walls and posed great challenges to existing construction technologies. How to make the geological conditions of the above-mentioned dam body suitable for the construction of cut-off walls? There is no construction precedent at home and abroad

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