| Self-balanced test method is a new method to determine the bearing capacity of the single pile, Compared with the traditional static loading test,It has a big advantage. It has solved the difficulty of single pile bearing capacity of pile,but also can save cost, test simple device, etc.This paper firstly introduces the status and development of pile foundation technology trends and then points out, the bearing capacity of pile foundation technology is headed in the direction of big emerging new theory, new construction technology is also in development.In this paper several detection method in brief areexpounded comparison:in the inspection of the main method has low strain reflected wave method, ultrasonic transmission method and so on, in the inspection of the bearing capacity is mainly static load test and high stress dynamic.Self-balanced method is currently emerging detection capacity method, this paper briefly introduced the development of both at home and abroad and, points out the different with traditional static load test of advantages.The article analyses the vertical bearing the load-transferring mechanism and the influencing factors, and then analyzes the pile trialing self balanced load transfer mechanism, and in a pile soil stress state and pile body stress and pile end destroying forms and positive and negative friction aspects elaborated profoundly from balance test method with traditional static load pressure pile load transfer mechanism of differentiation.The placement position of load cases, also mean searching questions of equilibria, which affect the balance test of whether complete critical work accurately and reliably. This paper summarizes the domestic that is now starting to engineering application and the load box placed situation examples. Analyzes the method of equilibrium position determined, mainly has experience value method, analog simulation test method and numerical simulation experiment method, the most commonly used experience value method can satisfy the demand of practical engineering. Self-balanced test parameters and how displacement load curve to the traditional static load piling conversion problem is the key work, the experiment method to basically have experience conversion method and precise conversion method. The experience conversion method is a commonly used method, also be more direct and simple method, its precision can satisfy engineering practical needs. Accurately change law theory level to be higher, the accuracy of the test parameters is high also, generally applied to large of the project is not very popular in domestic.Finally, combined with engineering practice, erhuanxi road of the application of balance testing method is introduced, points out that in the test, large capacity since balance method of pile the applicability and reliability. |
