Application Research of Chinese Fir Pole in Soft Soil Foundation Excavation

Underground diaphragm wall, CSM mixing wall, SMW construction method, cast-in-place pile, steel sheet pile, soil nailing wall and other support methods are often used in soft soil foundation excavation, which is very expensive. Chinese fir poles are readily available with low price and envrionment friendly, and have the advantages of strong corrosion resistance and convenience in construction. the tensile strength and the ultimate uplift bearing capacity of raw materials of Chinese fir pole were tested. According to the test results, reasonable parameters were selected for design and stability calculation, and the field test and foundation pit monitoring were carried out in a soft soil site in Qingdao. The field test and foundation pit monitoring results show that the Chinese fir pole can be used as soil nail. The design and stability calculation could be carried out according to the relevant calculation model of soil nail wall. It could improve the stability of foundation pit, reduce the space occupied by slope, reduce the excavation and backfilling earthwork of foundation pit, and then reduce the construction cost. It has good application value.