Research On The Bearing Character Of Pile Short Block

Geological conditions of Xi Yuan housing estate of Huainan city in Anhui Province in particular, as bearing layer of weathered rock buried shallow, design the artificial dig hole pile, the pile foundation construction of high-rise buildings, the artificial digging soon meet the bearing stratum, the manual is very difficult to cut, then the pile length and cannot meet the design requirements. Then you will encounter the pile length has been dug4meters, the length of pile is not up to the specification and design requirements, if want to continue to dig is wasting a lot of labor costs, if not the excavation cannot meet the requirements of design and specification.In order to solve this problem, in this paper, through the indoor geotechnical testing, basic theory research and field static load test combined bearing capacity of short piles, the lateral friction resistance, tip resistance stress strain relation and the upper load sharing ratio, short deformation coordination condition of rock socketed piles and destroy pattern an important conclusion.The indoor test side resistance, end resistance stress strain curve, from the laboratory soil test can be seen in Figure pile side soil reached the limit displacement, lateral resistance and strain relationship is linear relationship, ultimate strain of the lateral soil to damage in about1.8%. By uniaxial compression test indoor rock and three axial compression test, the uniaxial compression of rock ultimate end resistance when the average value is about10MPa, average displacement is about7.3mm; and the ultimate tip resistance of compression test the three axis average value is about68.5MPa, a shift is about3.7mm can be seen, the three axial compression test is more close to the actual situation.Calculation and analysis of rock socketed pile side resistance to obtain ultra short fundamental and displacement is sharing ratio of linear relationship of bearing capacity and lateral resistance and end resistance theory, the deformation compatibility conditions of pile end resistance formula, get the transfer law, analyzed the tip resistance and side resistance and bearing stratum rock properties, properties of pile, pile material the soil around the pile bottom sediment properties and the close relationship between. Finally, through theory calculation and field combined with the static load test to understand the status of the bearing capacity of rock socketed pile of ultra short and determine the ultra short rock socketed pile in pile length does not reach the requirements and bearing capacity can meet the design requirements.In this paper, through the analysis of relevant research, the transfer rules of some short block end resistance and the side resistance of pile, and the bearing capacity of the region, and through the field static load test curve of short pile embedded in rock pile top load and displacement between sedimentation, provide a reference for the similar engineering area.