Abstract:
Hardening soil small model (HSS) can consider not only soil shear and compression hardening, but also account for shear modulus attenuating in tiny strain range. Therefore, it has a good application for numerical analysis of excavations. To study the sensitivity of HSS model's stiffness parameters
E50ref,
G0ref and
γ0.7 on the excavation's numerical analysis results in Xiamen area, based on sensitivity analysis theory and orthogonal experiment theory, representative residual sandy sticky clay, silty clay and mucky soil are chosen to serve as research objects, and take surface subsidence value of excavation and enclosure wall's maximum moment value as a control index. Single control on soil layer's parameters sensitivity study is applied respectively. The result shows that to calculate surface subsidence and enclosure wall's moment accurately in excavation numerical analysis. Firstly, control the value of soil's
G0ref; secondly,
E50ref impacts less than
γ0.7; with the deepening of the excavation depth, the impact of
G0ref for surface subsidence becomes less, while
E50ref and
γ0.7 impacts more;
E50ref impacts less on enclosure wall's moment with the deepening of the excavation, while
G0ref and
γ0.7 tend to impact more, especially for
G0ref. The results show that small strain behavior of soil is of great importance to excavation construction and deserves more attention in relevant design and construction. The analysis results could provide references for the acquirement of more reasonable stratum deformation and structure inner force in deep excavation finite element analysis.