Investigations on the Failure Modes of Rock Slopes in Gyeongsangnam-do

경상남도에서 발생한 암반사면의 파괴유형 연구

Abstract

The purpose of this study is to identify the collapse characteristics by analyzing various factors causing collapse based on field survey and existing data on rock slopes occurring in the construction of roads and industrial complexes in Gyeongsangnam - do area. In the case of the slope where the slope has been directly surveyed, the analysis of the collapse characteristics can be used for the prediction and prevention of slope failure through the continuous collection of the slope data, database construction, management and analysis. The evaluation items used in the collapse characteristics of slope were selected among the items that can be regarded as objective evaluation items among the overlapping factors by comparing the evaluation items frequently used for the evaluation of the existing slope stability among various factors. The type of destruction of the rock slope depends on the type of carcass of the bedrock, such as planar fracture, wedge fracture, onho fracture, and conduction fracture, which are different from each other. And the slope stability analysis should be performed accordingly.

본 연구는 경상남도 일대의 도로 및 산업단지 시공과정에 발생된 암반사면에 대하여 현장조사 및 기존 조사자료 등을 토대로 붕괴를 일으키는 여러 가지 요인들을 분석하여 붕괴 특성을 파악하고자 하였다. 직접 조사한 사면가운데 붕괴가 발생한 사면의 경우 붕괴특성을 분석하여 붕괴사면 자료의 계속적인 수집 및 데이터베이스 구축과 관리 및 분석을 통해 붕괴사면 예측 및 예방에 활용할 수 있을 것이다. 절토사면의 붕괴특성에 사용된 평가항목은 여러 가지 요인들 중에 기존에 사면 안정성 평가에 많이 사용된 평가항목을 비교하여 중복되는 요소들 중에 객관적인 평가항목으로 볼 수 있는 항목을 선택하여 사용하였다. 암반사면의 파괴유형은 기반암의 암종에 따라 평면파괴, 쐐기파괴, 원호파괴, 전도파괴 등의 양상이 다르게 발생하므로 사면의 안정성을 검토할 경우 반드시 지표지질 조사를 실시하여 기반암의 암종을 분석한 후 그에 따른 사면의 안정성 해석을 수행하여야 한다.

Fig. 1. How to review by region

Fig. 2. Frequency of occurrence by type of destruction type according to rock type

Fig. 3. Definition of discontinuity direction

Fig. 4. Directional analysis of whole slope

Fig. 5. Directional analysis of igneous rock slope

Fig. 6. Directional analysis of sedimentary rock slope

Fig. 7. Directional analysis of metamorphic rock slope

Fig. 8. Directional analysis of joint plane

Fig. 9. Directional Analysis of Joint Surface of Iwasin Rock Slope

Fig. 10. Directional Analysis of Joint Surface of Sedimentary Rock Slope

Fig. 11. Directional Analysis of Joint Surface of Metamorphic Rock Slope

Fig. 12. Analysis of angles between slopes and joint faces (Strike)

Fig. 13. An analysis of the angle between slopes and joint faces of bedrock (Strike)

Fig. 14. Analysis of angles between slopes and joint faces (Dip)

Fig. 15. An analysis of the angle between slopes and joint faces of bedrock (Dip)

Table 1. Slope survey data by region of Gyoungsangnam-do

Table 2. Analysis of destruction type according to rock type

Table 3. Analysis of destruction type according to degree of weathering

Table 4. Analysis of destruction type with existence of faults

Table 5. Analysis of the type of destruction by presence or absence of packing

Table 6. Analysis of fracture type according to degree of crack

Table 7. Analysis of the type of failure according to slope height