Method for treating weathered deep groove of dam foundation of concrete dam

Abstract

The invention discloses a method for treating a weathered deep groove of a dam foundation of a concrete dam. The method comprises the steps that in the excavation process of the dam foundation of theconcrete dam, when the bag-like weathered deep groove is encountered, a weathered rock mass and a weathered soil body of the weathered deep groove are partially or completely excavated firstly, the lower half part of the deep groove is backfilled with large dimension stone stacked manually, steel pipes are pre-buried in dimension stone bodies to serve as drainage pipe sleeves, and drainage pump water inlets are reserved in the bottoms of the steel pipes; drainage pumps are arranged on a foundation surface of the dam, drainage pipes of drainage pumps are inserted into the steel pipes to communicate with the reserved drainage pump water inlets, and underground water is drained to the foundation surface of the dam in a pumped mode and then discharged out; and then a reinforced concrete supporting ring beam is arranged at the circumferential circles of the tops of the dimension stone bodies, the ring beam is connected with the solid rock mass around the deep groove in an anchored mode, under support of the solid rock mass, the backfilling manually-stacked dimension stone bodies serve as a concrete formwork, and a dome-shaped reinforced concrete cover plate is poured, and finally, the upper part of the reinforced concrete cover plate is backfilled with concrete to the elevation of the foundation surface of the dam. The construction technology is simple, the construction cycle is short, the quality is reliable and is guaranteed, the investment is saved, and the foundation treatment and reinforcement effects are obvious.

Description

technical field [0001] The invention discloses a method for treating a dam foundation, in particular to a method for treating a weathered deep groove of a concrete dam foundation. Background technique [0002] During the construction of concrete dams (including gravity dams and arch dams, etc.), various geological defects are often encountered during the excavation of the dam foundation. When encountering cystic weathering deep grooves, it will have adverse effects on the deformation and bearing capacity of the dam foundation. , need to be processed and strengthened. The traditional methods commonly used at this stage are to excavate all the weak rock mass, replace concrete, and strengthen consolidation grouting. This kind of treatment method is inconvenient for construction when it is applied to deep grooves, and it is accompanied by underground fissure water. The treatment period is long, and the amount of work and investment are huge. , and the construction quality is di...

AI Technical Summary

Problems solved by technology

[0005] Beneficial effects of the present invention: it overcomes the shortcomings of long period and difficult construction in the deep tank treatment of the traditional method, and proposes effective countermeasures and methods for the problem that groundwater affects construction installation and quality

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