APPLICATION OF SINGLE-STAGE CASING REAMING AND ONE-TIME FOLLOW-UP DRILLING TECHNOLOGY IN LANDSLIDE TREATMENT
A mountain landslide in Henan province has not been effectively suppressed even after two times of treatment.The pre-stressed anchor cable of the project needs to pass through the residual layers,the strings of boulders in each weathering layer,and the fractured zones developed in moderately weathered rock layers with a long hole depth and a large hole diameter.Therefore,solving the problems of hole collapse,sticking,and burying in drilling and ensuring the quality of drillinghas become a difficult and key point of the construction of this landslide control project.Based on this,a single-stage casing reaming and one-time follow-up drilling technology was adopted,which could not only effectively treat landslides,but also shorten the construction period and reduce the construction cost.
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