Type Selection and Stability Analysis of Gravity Anchor Foundation in Water-rich Pebble Layer
The problem of insufficient stability of the gravity anchor of the suspension bridge caused by high pressure waterhead in the rich water pebble layer is outstanding.Taking south anchor of Yidu Yangzhi River Bridge as example,the impact of changes in pressure waterhead on its stability and set-tlement deformation was studied based on simplified theoritical method and numerical method,and an optimization plan for the foundation form based on working conditions was provided.The results indi-cate that the cost of shallow buried and expanded foundation anchoring during dry season is low,easy to construct,and has generalizability.However,the decrease in pressure and friction between founda-tion and rock will significantly reduce the anti-skid safety factor due to large spread foundation area and increased pressure waterhead.In this situation,the overall stability of the anchorage body can be effectively enhanced based on the foundation toothed ridges structure or the clamping pebbles layer.For the case in the paper,keeping the base area unchanged and adding a toothed ridge with length of 10 m and width of 10 m,the anti-skid stability coefficient under high waterhead conditions can be in-creased from 1.99 to 2.21,with an significantly increasing in safety.
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