基于激光扫描的高边坡危岩体识别及锚固方法研究

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Abstract With the application of 3D laser scanning technique，high density point cloud coordinate data of high steep slope was obtained；and a surface model of high slope was established. Information of structure of rock mass of high slope and data of dangerous rock mass were extracted based on point cloud data obtained from 3D laser scanning. Based on this，a method for identifying dangerous rock mass was proposed；grid of point cloud coordinate data of dangerous rock mass of high steep slope was constructed；block element was formed，then the block element was divided by surface of spatial structure，spatial block model was formed；and the spatial block model was classified according to slide types of dangerous rock masses. Based on the limit equilibrium theory，the failure mechanism of all kinds of dangerous rock masses and the load combination acting on the dangerous rock mass，a calculation method of dangerous rock mass anchor was established. This method was applied to the investigation and rehabilitation of dangerous rock mass of Dongping Baifoshan slope；the minimum numbers of anchors of different kinds of dangerous rock masses were calculated according to the main kinds of loads acting on the dangerous rock masses of Baifoshan slope(such as weights，fissure water pressures，seismic forces and so on) and the stability coefficients of different kinds of dangerous rock masses. The results of the study show that：(1) Spatial coordinate data of high steep slope can be quickly obtained at a far distance with 3D laser scanning technology；then the spatial information and attitudes of the structure of the rock masses can be obtained. (2) Based on the spatial coordinate data of dangerous rock masses，the spatial information of surface of structure and different kinds of load combinations，classification of dangerous rock masses and calculation of anchoring can be carried out；the numbers of anchor bolts and anchor cables needed in the dangerous rock mass anchoring were obtained；and the results can be referenced for rehabilitation and design of dangerous rock masses. Engineering example shows that this method has strong applicability and reliability；and it benefits to design and optimization of reinforcement scheme of dangerous rock masses of high steep slopes.

Key words： slope engineering laser scanning high steep slope structural surface of rock mass identification of blocks anchor

Received: 10 April 2012

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http://www.rockmech.org/EN/Y2012/V31/I10/2139

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