Stability Analysis of Island Slope and Evaluation of Treatment Urgency in the Changdao Islands
To address the easy instability of 41 rock and soil slopes in the Changdao Islands,the potential slope instability mechanisms and their influencing factors are analyzed on the basis of data collection and field geological investigations.Based on the methods for the saturated-unsaturated seepage simulation of finite element and for the finite element strength reduction,the stability of the target slopes is analyzed and simulated under the conditions of non-rainfall and potential extreme rainfall,and the dynamic destabilization processes induced by potential rock collapse and soil slope sliding are quantitatively simulated by using respectively the nonlinear finite element contact algorithm and the coupled Eulerian-Lagrangian approach.The analysis results show that the rocky slopes have a better overall stability,but the potential risk of collapse caused by loose rock mass on the slope surface is relatively higher.Although the scale of the soil slopes is relatively smaller,some high and steep slopes have a certain possibility of instability under the conditions of extreme rainfall and adverse crack.Finally,the treatment urgency of the two easy instable slopes mentioned above is comprehensively ranked by using fuzzy comprehensive evaluation method,which can provide certain reference for the future detailed evaluation and treatment of the slopes in the Changdao Islands.
island slopeslope stabilityrainfalllandslide hazardfuzzy evaluation
NETL
NSTL
万方数据
