Pretreatment method for landslide dam impervious wall grooving construction

A technology for trough construction and anti-seepage wall, applied in blasting and other directions, can solve the problems of high cost of demolition, difficult construction of anti-seepage wall, overhead phenomenon, etc., to achieve good construction quality, reduce the risk of trough collapse, and prevent the hole inclination exceeding the standard. the effect of the situation

Pending Publication Date: 2020-01-03
SINOHYDRO FOUND ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • Pretreatment method for landslide dam impervious wall grooving construction
  • Pretreatment method for landslide dam impervious wall grooving construction
  • Pretreatment method for landslide dam impervious wall grooving construction

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Effect test

Embodiment 1

[0052] For the dam body whose boulder content exceeds 50%, the maximum particle size of the boulder exceeds 15 meters, and the depth of the cutoff wall exceeds 100 meters, the method of the present invention carries out blasting treatment (i.e., pre-explosion) in advance before the cutoff wall is formed into grooves. Carry out crushing treatment to the boulder (the flow chart is as follows Figure 6 Shown): First, drill a blast hole for placing explosives, then break the boulder in the blast hole by explosives. Below, the method of the present invention will be described in detail.

[0053] S11. Drilling blast holes

[0054] The present invention drills a row of blast holes (such as figure 1 As shown, the ones marked with YB in the figure are blast holes), and the distance between adjacent blast holes can be 1.2-1.6m, preferably 1.5m in this embodiment.

[0055] When drilling, drill to the maximum depth according to the geological conditions of the site construction and the co...

Embodiment 2

[0085] After blasting the large boulders in the formation, although there are no large boulders in the formation, because the formation after the blasting treatment is relatively loose, it is easy to appear during the grouting due to the loose formation during the trench construction of the cut-off wall. The phenomenon of hole collapse and grouting, therefore, this embodiment can also be on the basis of embodiment 1, in order to transform the stratum with loose and overhead phenomena into a uniform, stable and complete stratum, such as image 3 The shown method of drilling grouting holes in the above strata in advance and grouting the loose stratum through the grouting holes (that is, pre-filling) is used to improve the loose stratum. The method will be described in detail below.

[0086] S21, drilling and setting grouting holes

[0087] After the boulder is broken into a uniform stone, a row of upstream grouting with a depth of more than 70 meters is drilled at intervals upst...

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Abstract

The invention discloses a pretreatment method for landslide dam impervious wall grooving construction. The pretreatment method includes the steps that a row of blast holes are drilled in the axis of alandslide dam impervious wall with the boulder content exceeding 50% at intervals; and after blast hole drilling is completed, boulders in the blast holes are subjected to blasting treatment, the boulders are broken into stones, and grooving construction of the landslide dam impervious wall can be conducted under the block geological conditions. By means of the method, the landslide dam geological conditions that many boulders exist, the particle size is large, the overhead phenomenon is serious, and a stratum is not deposited and cemented can be improved, and impervious wall construction canbe better conducted on the stratum subsequently.

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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F42D1/08F42D3/04
CPCF42D1/08F42D3/04
Inventor 宗敦峰肖恩尚石峰陈小明孙亮刘振国刘书鹏
Owner SINOHYDRO FOUND ENG
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