Determination of Rock-socketed Pile Interface in Granite Area of Shenzhen, China

Affected by the development of fissures and uneven weathering, the surface of the medium- or micro- weathered bedrock has significant undulations, companying with weak interlayers and spherical boulders. The correct determination of the rock-socketed pile interface is the key, but there are no unified judgment standards and methods at present. Accordingly, with the background of the characteristics of granite strata in Shenzhen, relying on the engineering example of a high-rise building embedded rock pile, the engineering experience of the rock-socketed pile interface determination from the perspective of investigation and construction were summarized. Combining the low-strain integrity test and the field load test, the bearing capacity effect of a single pile with higher bearing capacity requirements was evaluated. According to the test results, the integrity of the pile body was evaluated as class Ⅰ. The measured values of vertical compressive bearing capacity of single pile meet the maximum load required by the load test and meet the design requirements.