INSTRUMENTED HYBRID SHORING SYSTEM FOR A DEEP TEMPORARY EXCAVATION INCORPORATING CUTTER SOIL MIXING IN VANCOUVER, BC, CANADA

摘要

A hybrid shoring system consisting of cast-in-place soldier piles with Cutter Soil Mixing (CSM) infillrnpanels was constructed for temporary support of a 19.8 m (65 ft) deep excavation in Vancouver, BritishrnColumbia, Canada. Deep Mixing (DM) was completed up to 9.7 m (32 ft) in fill, peat, wood waste andrnclayey silt with embedment in dense till, and soldier piles constructed through the dense till extending tornbelow final excavation level. Two trial CSM panels were installed ahead of production to assist withrndeveloping the termination criteria of the CSM panels in the dense till. The constructed depth of the CSMrnpanels was based on interpretation of real-time monitoring data obtained through the Bauer B-tronicrnsystem. Inclinometer monitoring data from two CSM panels and two soldier piles, as well as soldier pilernsurvey target data was used to assess and monitor the performance of the hybrid shoring systemrnthroughout bulk excavation. The objectives of this paper are to provide an overview of the design andrnconstruction aspects of the hybrid DM shoring system and to present inclinometer and pile target data torndemonstrate the lateral performance of the CSM infill panels and soldier piles. This paper also discussesrnthe merits of using real-time monitoring data as part of the engineering decision-making process forrnvalidating CSM panel construction.