He Keqiang

Research on the displacement response ratio of groundwater dynamic augment and its application in evaluation of the slope stability

On the basis of systematic analysis on the motivation and mechanism of displacement and destabilization of the water-induced landslides, this paper completes a study on the relationship between groundwater dynamic effect laws and displacement response characteristics in the process of the colluvial landslide stability evolution. It is found that the displacement and destabilization of landslide are directly controlled by the underground water level variation and also there exists one-to-one corresponding relation between the deformation of landslide and the groundwater level variation. On the basis of the results above, the underground water level increment and the corresponding deformation variation are taken to be as the dynamic load parameter of landslide and the dynamic incremental displacement response parameter, respectively. Then the displacement dynamic appraisal parameter and prediction model of the groundwater dynamic incremental displacement response ratio are determined in term of the basic principle of elastic–plastic mechanics in this paper. Meanwhile, taking the typical colluvial landslide in the Three Gorges Reservoir Area—Xintan landslide as an example, the values and changing rule of the groundwater dynamic incremental displacement response ratio parameter of the A3 and B3 monitoring points on this landslide are obtained by means of the groundwater dynamic incremental displacement response ratio prediction model, finding that the change rule of the dynamic incremental displacement response ratio-time curve is consistent basically with the dynamic stability evolutional law of the actual slope. The research results show that the groundwater dynamic incremental displacement response ratio prediction model can be used to forecast the kinetics of displacement for this slope, and this method has widely theory and extensive practicality.

Comprehensive analysis and quantitative evaluation of the influencing factors of karst collapse in groundwater exploitation area of Shiliquan of Zaozhuang, China

Karst collapse is a type of complicated environmental and geological hazard that can be caused by many factors: natural factors, such as rainfall, and human activities, such as overpumping of groundwater. Therefore, it is important to make a comprehensive analysis and evaluation on karst collapse risks and impacts of the influencing factors of karst collapse. However, how these factors affect karst collapse is still a problem, which has not yet been well solved. Taking the karst collapse in groundwater exploitation area of Shiliquan of Zaozhuang, China, as the example, and based on the comprehensive analysis of the formation rule and mechanism of karst collapse in this area, this paper mainly employs Quantification Theory to make a quantitative analysis and evaluation of various influencing factors of karst collapse in the groundwater exploitation area of Shiliquan of Zaozhuang. It thereby determines the impact of different influencing factors on karst collapse strength, and identifies the dominant and minor factors that affect the karst collapse. It also provides some criteria for the prevention of karst collapse and protection of karst water resources and environment.