Study On Force Character And Rock-socketed Length Of Rock-socketed Piles

In view of load transferring capability of rock-socketed piles,this paper compares rock-socketed piles with non-rock-socketed piles,analyzes influencing factors (pilelengtru pile diameter pilemodulusx character of bearing stratuiru mud hull sediment of pile bottom and roughness) on force character. With different load transferring functions,a set of analytical equation for single pile settlement calculation of rock-socketed piles are established:three stages of P-S curve from analytical equation are gained which are straight linex curve x straight line;and relationship curves in different pile modulus and in different rock-socketed length.Beginning with plentiful experimental bases,some problems about pile-foundation technical criterion are discussed,some suggestions about are advanced,some rules about rock-socketed offect are educed:rock-socketed pile has conclusively rock-socketed offect,and when rock-socketed length achieves a certain value,increasing length will not influence bearing capacity,but base resistance still exists.Based on the neural network model of limit load of rock-socketed segment of piles,the analysis method of characteristic parameters is proposed by means of self-organizing character map network. The analysis results are consistent with practical results.Establishing 3-dimensions finite element model by ANSYS,this paper analyzes and researches the law of displacement field,stress field and strain field which validates the results of chapter 3:rock-socketed pile has the best socket length,but it hasn't the longest socket length,this paper recommends the best socket length 2 m. The results will be helpful for engineering application and more research about rock-socketed piles.