Numerical modelling of ground improvement techniques considering tension softening

摘要

Ground improvements methods such as mixed-in-place and jet grouting techniques have provenrnto be efficient auxiliary measures for deep excavations constructed in poor ground conditions. Although therndesign is primarily based on empirical rules, numerical methods are frequently employed in order to assess therndeformation behaviour of these structures, but increasingly also to evaluate the stress state in the treated soil.rnThis requires the use of appropriate constitutive models capturing the main features of the mechanical behaviour,rnnotably their limiting tensile strength and initiation of cracks. In this paper a newly developed constitutive modelrnis applied to simulate the behaviour of a jet grout panel supporting a deep excavation against uplift pressure. Itrncould be shown that a reliable estimation of the stress distribution and crack patterns in the slab can be obtainedrnproviding a basis for optimization with respect to tension piles or geometry of the jet grout slab.