90. Safety Evaluation of Dike with Cracks

Dilapidation or cracks existed in dike, only few influencing factors were considered, and systematic quantitative results lacked, safety character of dike was not clarity under the work of cracks. Based on theory of unsaturated soil mechanics and analysis model of cracks, influencing factors on safety of dike such as depth of cracks, status of cracks filled with water, changing of water level, rainfall, seepage coefficient and so on were analyzed, systematic quantitative results of dike under the work of cracks were achieved. Analysis shows that the depth of cracks is deeper, the safety coefficient of dike is less, safety status of dike becomes bad while cracks filled with water. Moreover, the endangering degree of dike with cracks keeps close correlation with characteristic of soil, the chance of accident keeps direct proportion to duration of rainfall, intension of rainfall, depth of cracks, decreasing velocity of water level about dike-slope at near-river. The results can be applicable as a reference in flood prevention, emergency dealing with, maintenance and reinforce.