High-geostress dam foundation excavation construction technology
A construction technology and high ground stress technology, which is applied in basic structure engineering, excavation, and testing of basic structures, etc., can solve the problems of delay in construction period, damage and destruction of unloading adjustment, long construction time interval, etc., to save construction period and Construction cost, good economic benefits, and the effect of avoiding secondary excavation
Active Publication Date: 2012-09-26
SINOHYDRO BUREAU 7 CO LTD
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Problems solved by technology
However, when the dam foundation is excavated in an alpine gorge, the height difference between the two sides is extremely large, and a natural high geostress area is formed at the bottom of the gorge. The foundation surface after excavation has been exposed for a long time. Under the action of comprehensive factors such as stress release and gravity unloading, unloading springback and relaxation damage are prone to occur, making the rock mass unable to meet the requirements of the arch dam foundation surface
The traditional construction technology of excavating the dam foundation
Method used
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[0021] The present invention is further described by the following examples. This example is only used to further illustrate the present invention, but it cannot be interpreted as limiting the protection scope of the present invention. Essential improvements and adjustments belong to the protection scope of the present invention.
[0022] combine Figure 1 to Figure 5 .
[0023] The excavation construction technology of high ground stress dam foundation includes the following steps:
[0024] A. Pre-cracking and excavation on the outside of the dam foundation protective layer. The drilling equipment 1 drills the blast hole 2 and the pre-split hole 3 in the outer area of the dam foundation protective layer 4. A dam foundation protective layer 4 with an appropriate thickness is reserved outside the base surface 5; the thickness H of the dam foundation protective layer 4 is 25 to 40 times the diameter of the charge at the bottom of the blast hole in the step, forming the angle...
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The invention discloses a high-geostress dam foundation excavation construction technology. According to the high-geostress dam foundation excavation construction technology, before the excavation of a dam foundation, a dam foundation protecting layer with slope being smaller than or equal to that of the dam foundation and thickness being 25-40 times diameter of bottom charge of a bench blast hole is reserved; and anchor bars running through the dam foundation protecting layer and the dam foundation are pre-anchored before the dam foundation protecting layer is excavated to form a foundation building surface of a designed dam foundation. By adoption of the high-geostress dam foundation excavation construction technology, uploading relaxation and backfilling deformation, even the phenomena of'crack slip', plate fracturing and local rock bursting caused by high geostress in the excavation of the dam foundation are avoided, therefore secondary excavation resulting from the uploading relaxation and the backfilling deformation of the foundation building surface of the dam foundation can be effectively avoided; and by consolidation grouting and repeated anchoring construction, the construction period and the construction cost are greatly saved and a remarkable economic benefit is obtained.
Description
technical field [0001] The invention belongs to the technical field of water conservancy and hydropower building construction, in particular to the technical field of civil construction in water conservancy and hydropower construction, and particularly relates to a high ground stress dam foundation excavation construction technology. Background technique [0002] In the construction of hydropower stations, the quality of dam foundation excavation is directly related to the stability and safety of the entire project. However, when the dam foundation is excavated in an alpine gorge, the height difference between the two sides is extremely large, and a natural high geostress area is formed at the bottom of the gorge. The foundation surface after excavation has been exposed for a long time. Under the combined factors of stress release and gravity unloading, it is prone to unloading springback and relaxation damage, so that the rock mass cannot meet the requirements of the arch d...
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Inventor 张登柱蔡超殷本林张宇蒋爱民
Owner SINOHYDRO BUREAU 7 CO LTD
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