Bearing Capacity Effect Research Articles

Truck Crash Performance Evaluation of Guardrails Made of PosMac Steels Considering the Ground Bearing Capacity Effect

Truck Crash Performance Evaluation of Guardrails Made of PosMac Steels Considering the Ground Bearing Capacity Effect

Time Effect Research of Prestressed Pipe Pile Based on High Strain Dynamic Test

More detailed information about the bearing capacity and integrity of the pile can be obtained by high strain dynamic test than by dead-load test [1]. Engineering examples show that the bearing capacity of the prestressed pipe pile gradually increase with the growth of the resting time, and the ultimate bearing capacity of the pile can reach up to 2 times more than the initial bearing capacity. Through the study of the time effect mechanism, it is found that the increment of ultimate bearing capacity of the single pile is mainly caused by side soil resistance. The end resistance has little influence on the time effect of bearing capacity of pile.

Study on Normal Section Bearing Capacity of Stone Arch Rib Enclosed by Reinforced Concrete

The mechanical behavior and failure mechanism of stone arch rib enclosed by reinforced concrete under different existed stress state is obtained by the failure test. Normal section bearing capacity effect of different stress states is studied by test results. Then an analytical method considering the influence factors is proposed to count normal section bearing capacity of stone arch rib enclosed by reinforced concrete.

Research on Time Effect of Bearing Capacity of Jacked Pile in Soft Soil

Through the study on the characteristics of bearing capacity of jacked pile in soft soil, it is found that the increment of ultimate bearing capacity of the single pile is mainly determined by pile side resistance. The end resistance has little influence on the time effect of bearing capacity of pile. The relationship between ultimate bearing capacity and time can be expressed with logarithmic curve. According to penetration mechanism of jacked pile, the expansion of a series of spherical cavities in semi-infinite space is used to simulate the process of pile installation. Soil is assumed as Mohr-Coulomb material. Based on the theory of spherical cavity expansion, estimating formulas were proposed to calculate the ultimate side frictional resistance. Then the ultimate bearing capacity of single pile in different time can be obtained. Analyses show that the calculation results are close to the measured data and the error between computed and measured value is little. So it is acceptable for the formula to forecast bearing capacity of jacked piles.

Pit Bearing Capacity Effect to Status of Soil Plug during Pile Driving in Ocean Engineering

Foundation piles of the offshore oil platforms in Bohai Bay are usually longer than 100m with a diameter larger than 2m. Thus, thoughtful drivability analysis has to be performed in the design stage because of the high cost and time limitation. It has been shown that to judge if the soil column inside the pile is fully plugged, which will make the pile behave as close-ended, will strongly influence the accuracy of drivability analysis. Engineering practice repeatedly indicates that the currently widely used methods for soil plug judgment often give incorrect results, leading the designers to make a wrong decision. It has been found that this problem is caused by the ignorance of the bearing capacity provided by the soil surrounding the pile. Based on the Terzaghi’s bearing capacity calculation method for deep foundation, a new approach for judging soil plug status is put forward, in which the surcharge effect has been considered and the dynamic effect coefficient is included. This approach has been applied to some practical engineering projects successfully, which may give more reasonable results than the currently used method.