Application of Surcharge Method Combined with Self-balanced Method in the Pile Axial Compressive Loading Testing
To meet the requirement of axial pile loading test before the foundation pit excavation,it was decided that the loading test method should be the combination of the surcharging method and the self-balanced method after an estimation of the ulti-mate axial pile capacity.Meanwhile,the load transducers were placed within the effective range of the pile to monitor the distri-bution of loads along the pile shaft during the loading process,so that side resistance along the pile can be calculated.The com-bination of the surcharging method and the self-balanced method can easily solve the problem of completing the pile loading test before foundation pit excavation.All three test piles have no damage under the design maximum loading,and the axial ultimate capacity of the single pile is therefore the design ultimate loading value.The results of pile load distribution test show that the soil layer has not reached the limit state under the maximum test load.The ultimate axial pile resistance is not fully mobilized.
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