Inverted grouting method suitable for flat-top cave roof rock mass anchoring engineering

Abstract

The invention relates to an inverted grouting method suitable for flat-top cave roof rock mass anchoring engineering. The inverted grouting method comprises the steps that in the anchor rod mounting process, a plurality of grouting pipes extending into drill holes by different lengths are buried, then a multi-time grading grouting and hole bottom grout returning method is adopted, through multi-time grouting, the gravity problem in the vertical grouting process from bottom to top is solved, the grout filling compactness is ensured, and the grouting quality of the anchoring engineering is effectively improved. The inverted grouting method breaks through the limitation of a traditional grouting method of stone cultural relic protection anchoring engineering, can be used for anchoring grouting in different directions and at different angles, provides a new grouting method for flat-top cave roof cracking rock mass anchoring engineering, and also provides a new thought for research and engineering application in the field of geotechnical engineering.

Description

technical field [0001] The invention relates to the field of reinforcement and protection of existing rock masses in grotto temples. Specifically, it is a bottom-up grouting technique and method suitable for rock mass anchorage projects in flat-topped grottoes. The method can effectively eliminate gas in anchor holes, Multiple graded grouting and grouting at the bottom of the hole are used to ensure the compactness of grouting. Background technique [0002] China's cave temples are rich in variety and number, vividly reproducing the beginning and development of Buddhist art and culture in my country, and are very important art treasures in my country's material cultural heritage. At the beginning of the excavation of the grottoes, the original stress balance state inside the rock mass was destroyed, providing sufficient space for the unloading and relaxation of the rock mass, and the excavation of the cavern caused stress redistribution and unloading tensile deformation. Th...

AI Technical Summary

Problems solved by technology

However, in the anchoring project of the rock mass on the roof of the flat-roofed cave, the anchor rod must be implanted into the rock mass from the bottom to the top vertically. If the traditional anchor grouting method is used, the grout will flow downward under the action of gravity, which will easily cause the anchor hole part to be damaged. Cavities are formed in the area, and the low density of grouting reduces the anchoring capacity of the anchor rod, which affects the quality of the anchoring project and is not conducive to the long-term preservation of the site

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