Comparative Study On Vertical Bearing Capacity Self-Balance Method Of Piles And Traditional Static Load Test Of Piles In Yunnan Construction Project

At present,our country usually uses the static load test method to test the pile foundation.This method is the most stable method.However,some pile designs have a particularly large bearing capacity,and their volume is huge and the weight is huge.The detection device used is not only expensive but also heavy.It takes a long time to detect and requires a large floor space.When carrying out bearing capacity tests on some special construction sites and heavy piles,It is difficult to meet the requirements.Nowadays,such tests are difficult to adapt to the actual situation in Yunnan Province.At this time,the self-balancing detection method of pile bearing capacity can overcome this problem well.This kind of detection method can detect piles with large weight,and is not subject to the influence of complicated detection environment,high detection efficiency,short time,and easy operation.However,industry experts believe that the results obtained by the traditional static load test method have higher credibility and reliability,while the self-balancing method is applied late in China.The results obtained by this test method are not universally recognized.Although this method has been successflully used in major cities in many regions such as Su,Lu,and Anhui,it has not been widely used in Yunnan,especially in housing construction projects,because of the self-balancing technology of pile bearing capacity in this area.There is not enough practice dat,and there is a lack of comparative data on this method and conventional static load detection in the geological environment of the region.In this paper,the self-balancing test and the traditional static load test are carried out by selecting six test piles of a certain geotechnical engineering site and pile foundation construction technology in Kunming,and the test side of the single pile vertical compression static load test is adopted.Frictional resistance,pile end reaction force with load and load-displacement curve.At the same time,based on the actual test,the above two types of methods are compared and analyzed.It is found that the load boxes are placed in different places,and the pile end resistance has different degrees of play.Therefore,the tested pile end resistance values will also have large differences;There is a deviation of the equilibrium point calculated by the empirical value method;the value of the correction coefficient ? of the upper pile side friction resistance needs to be compared under a large number of similar conditions.The experimental study of y is recommended to take 0.8.In other parts of Yunnan Province and geological conditions,the value of y needs to be further studied and determined;the comparison mainly refers to related aspects such as carrying capacity,time-consuming,cost,etc.,thereby using the self-balancing of pile bearing capacity for future housing projects in Yunnan.The method provides a certain reference.