Papers by Keyword: Bored Pile

Abstract: Currently, bored pile been widely applied in the current road and bridge construction, But its construction technology in complex geological case is still not perfect. In view of this, this paper carried out a high-speed Lakes viaduct extraordinary pile foundation construction project. For the analysis of the technical difficulties in the construction process, explore get the corresponding key construction technology, and it relates to the accident and its approach are summarized, study drew long pile construction technology Lakes geological conditions under soft silt and clay, solve the long holes bored pile into the lake silt soft clay under geological conditions, verticality control and other technical problems, can provide reference for similar projects.

Abstract: In this paper, the poor applicability problem which the bridge foundation bored piles reinforcement design in the actual application process is not related to specifications is studied, and bored pile length calculation L_P is optimized specifically, as well as, friction pile reinforcement design problems are also researched. Verified by examples show that the optimized reinforcement design fully meet engineering safety requirements, meanwhile, more economical.

Abstract: This paper improves the method of calculating the vertical bearing capacity of bored piles, and unifies calculation method of singe pile under horizontal force, as well adds and modifies the design parameters of the specification, finally utilizes actual example to make a unified test of the above methods. The results proved that, through the optimization of bridge foundation design method of bored piles, it can significantly reduce construction cost, and makes the pile length, pile diameter, and reinforcement more safe and reasonable. At the same time, it has great directive significance to the design and construction of the bridge.

Abstract: Based on the field test of bored piles at wharf detected by low strain reflection wave method, time-history curve features and defect position of intact piles and defective piles contrastively analyzed, with verification of on-site drilled core testing. The reason for discrimination error between specific defect position and actual data when processing low strain reflection wave method are derived, based on the analysis of effect of defective piles strengthened by pressure grouting method retested by low strain testing, practical measures of on-site low strain reflection wave testing are purposed to improve detection accuracy.

Abstract: Chishi Bridge is seated on Carboniferous limestone and Carbon limestone in which karst is strongly developed. Based on analysis the characteristics of the construction of bored Pile an geology, a scientific safety assessment system is the established and Fuzzy AHP(Analytic Hierarchy Process) is used to conduct a comprehensive safety assessment. The results are accordant with the actual and good results can be achieved. But in practice same new situation may be meted, the evaluation system suit be improved and supplement constantly to make the system more perfect.

Abstract: Using the Drucker-Prager elastoplastic constitutive model to describe the nonlinear deformation behavior of soil and simulating step loading on static test piles by ANSYS model which only consider linear elastic compression of pile body. By comparing ANASYS simulation value and the measured values of pile’s axial force and side friction, it shows that the greater the load ratio which transfer through the bottom of the pile, the pile-soil stiffness ratio increased; when vertical load is small, analysis results of elastic theory are fairly accurate. ANASYS simulation results have high accuracy when vertical load is bigger.

Abstract: In consideration of the geology and hydrogeology of the strata in Chengdu city, and in view of the general depth of subway station, its main structure and retaining enclosure for foundation pit constructed with open cut method is generalized in this paper. In order to expound the design of subway station structure with open cut method, a typical design of subway station in Chengdu subway line 7 is illustrated in the paper. The design of open cut subway station structure and its enclosure in Chengdu is still summarized and can be used to guide the structural design of subway stations under similar conditions with open cut method (OCM).

Abstract: The O-cell test method which was applied on the pile load testing was introduced, including the basic principle, test device and test technique. Based on the project of offshore structure in Malaysia, the O-cell test was performed on the long rock socket bored pile. The bearing behavior and load transfer characteristics were analyzed. The shaft friction in the rock played an important role in the pile shaft friction. In some long rock socket pile, The O-cell method cant test the ultimate capacity of some long rock socket pile.

Abstract: The bearing capacity characteristics and side friction characters of post-grouting pile were studied in the static load test which included two piles with post-grouting or not. When the pile head settlements were same, the loads applied on the pile top were used to analyze the bearing properties of post-grouting pile. We got the ultimate side friction of post-grouting pile after fitting test curves of relations between friction resistance and displacement. The tests indicate that both the bearing capacity characteristics and side friction of post-grouting pile are increased in various degrees.

Abstract: This paper derives a numerical simulation of direct shearing test and model pile test based on the measured data of bored piles. Characteristics of the interface between bored pile and soil around it are analyzed. Laws of the magnitude and the distribution range of point resistance and frictional resistance of the bored piles in granular and clayey soil are obtained and the mechanism on them is explained.