Grooving method of landslide dam diaphragm wall

Abstract

The invention discloses a grooving method of a landslide dam diaphragm wall. The grooving method comprises the steps that boulders large in mass are crushed into small stone; upstream and downstream leakage passages on the axis of the landslide dam diaphragm wall are blocked; grooving construction of the landslide dam diaphragm wall is carried out and comprises the step that drilling constructionis carried out with the axis of the landslide dam diaphragm wall as the datum so as to form a preliminary groove hole; in the process of forming the preliminary groove hole through drilling construction, whether a serious fracture leakage formation exists or not is detected; and if it is detected that the serious fracture leakage formation exists, a plugging material is placed on the leakage passages through a pneumatic combined plugging method so that the leakage passages are blocked rapidly, and then drilling construction continues so as to form a final hole. According to the method, the geological conditions of landslide dams which are large in number of boulders, large in particle size and severe in overhead phenomenon and are provided with strata not deposited and cemented can be improved, slurry leaking positions can be rapidly blocked, groove collapsing can be avoided, the construction period can be shortened, the construction cost can be reduced, and the later concrete pouringspeed can be increased.

Description

technical field [0001] The invention relates to the field of water conservancy and hydropower engineering, in particular to a method for forming a groove for 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 experience mainly focused on d...

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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 the cut-off wall. During the construction of the cut-off wall, the mud leaks when the hole is drilled into a groove. If the traditional treatment method is used, low-grade concrete (C10) is poured in the groove. The time is long, the cost is high, and if the treatment is not timely, it is easy to cause serious consequences of the collapse of the trench. For the above-mentioned strata with severe overhead, if a slurry leak occurs, whether the leak can be quickly plugged is the key to ensuring the safety of the slot. Technology poses a great challenge. How to make the geological conditions of the above-mentioned dam body form a geological condition that is conducive to the construction of the cut-off wall. There is no construction precedent at home and abroad.

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