ENGINEERING ROCK MASS QUALITY ASSESSMENT FOR POST EARTHQUAKE HIGH SLOPE AT HONGSHIYAN

Strong earthquake can affect the engineering quality of the rock mass forming the shallow strata of the high and steep rock slope. Moreover, engineering rock mass quality of the slope damaged by strong earthquake is crucial to making construction management plan and assessing the safety of slope. Considering actual characteristics of the slope caused by seismic disturbance, this paper applies three-dimensional laser scanning technology, based on the basic quality(BQ)system, to recognize rock mass discontinuity and joint cracks. Meanwhile, the paper combines with rock mechanical test, puts forward a method for engineering slope rock mass quality assessment. The presented method is used to assess the engineering rock mass quality of the Hongshiyan slope(zone Ⅱ)in Ludian, Yunnan Province. The results show that the shallow rock mass is awfully broken, a bit hard, and is classified as Ⅳ-class. Furthermore, the results are consistent with the practical situation. The present method can identify the structural surface information on the premise of not arriving at measurement site and is particularly appropriate for broken rock mass quality assessment of high and steep slope where surveyors cannot arrive. The paper can provide a reference for other similar projects.