Publication Abstract

Proceedings of the Deep Mixing 2015 Conference, (DFI)

Load-Deformation Based Design of Deep Mixing for Supporting MSE Walls at Kitimat LNG, BC
Marina S. W. Li, C.Eng., P.Eng., Isherwood Associates, Canada; Randy R. Williams, P.Eng., Golder Associates Ltd., Canada; George M. Filz, Ph.D., P.E., Virginia Tech, United States; Brian W. Wilson, C.Eng., P.Eng., Pacific Ground Engineering, Canada

Detailed design of an extensive deep mixing (DM) scheme using the Cutter Soil Mixing (CSM) technique was completed for foundation support of mechanically stabilized earth (MSE) walls for Kitimat Liquefied Natural Gas (LNG) at Bish Cove, British Columbia, Canada. The design was based on the provision of soil-cement structures, constructed in highly variable subsurface conditions that consisted of thick deposits of fine-grained soils overlying granular soils, and required to meet project-specific performance criteria, to support the MSE walls. The design, consisting of rectangular CSM panels constructed to form barrettes connecting to a longitudinal wall of continuous CSM panels, was configured to manage the distribution of stresses and strains that could be developed within the soil-cement structure. The results from 2D finite element analyses were used to determine the necessary arrangement and properties of the CSM panels to accommodate localized areas of relatively high shear, tensile and compressive stresses within the soil-cement structure. The relationships between unconfined compressive strength and elastic modulus for fine-grained and granular soil-cement structures obtained from the Bish Cove data were compared with published references and were found to be significantly different in the higher strength range materials.

 article #2032; publication #1013 (DM-2015)