Abstract：
The middle air shaft foundation pit of a Guangzhou subway line is located in a downtown area and there is slightly weathered rock stratum just about 11m under the foundation pit. Six hard rock excavation methods were compared with each other and analyzed before construction and it was determined to use rotary digging drill to drill through and excavate the free face. Full-section large-area drilling was carried out along longitudinal and horizontal directions after excavation to the rock stratum and then large explosion machine was used to blast hard rock. Earth rock excavation was successfully and effectively finished.
ZHOU Yong-qu,LI Tao. New Method for Deep Foundation Pit Hard Rock Excavation under
Complex Urban Environment[J]. Architecture Technology, 2018, 49(11): 1180-.
