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proposed an analytical method to obtain the limit solutions of slope stability under both dynamic and static conditions. built a new recognition model to assess the risk grade of expansive soil slope stability during construction, and the rationality of the proposed model was proved. Many scholars have carried out research on slope stability evaluation and landslide prediction. Through slope stability analysis, the change trend of slope stability could be grasped in time, while the potential damage could be found and the corresponding measures could be taken ahead of time, to avoid unnecessary losses. Therefore, slope instability has become the most important issue that affects and perplexes the safe operation of mines. In China, high proportion of open-pit mining projects in mines exists, at which landslides in the open-pit mines could result in significant economic losses and large number of casualties. Slope stability of open-pit mine constitutes a long-term research topic accompanied by open-pit mining. Finally, the control effects of ordinary cables and NPR cables on the instable W13 slope section were compared and studied through FLAC3D simulations, and the reinforcement effects of NPR cable on the anti-dip slope were proved as significant meanwhile, the corresponding reinforcement methods in the failure mine areas were proposed, laying a reference for the instability failure control and reinforcement of similar anti-dip slopes. Subsequently, the stability of open pit in current situation and final boundary situation was estimated with FLAC3D software, for the potential slope vulnerable areas to be comprehensively identified. Changshanhao open-pit gold mine was taken as an example based on the field geological investigation and rock mechanics testing, a three-dimensional engineering geological model of open-pit mine was constructed. Consequently, the control effects on the toppling failures of slopes were necessary to be researched. Compared with the ordinary cables, negative Poisson’s ratio (NPR) cables can provide a constant resistance force and high deformation inhibition during slope deformation, avoiding the occurrence of slope instability hazards. The concluded remarks herein on the significant effects of the soil hardening plasticity on the seismic performance of the adopted 20-story moment-resisting frame would be applicable to the other structures on a mat foundation, potentially experiencing the foundation rocking amidst the earthquakes.As the scale and depth of mines increase, large deformations of high-steep slopes progressively become prominent. The life safety limits for the transient and residual total inter-story drift ratios were not met whilst considering the soil pre-failure plasticity.
#FLAC3D FRUME PLUS#
The numerical predictions included the response spectra at the seismic bedrock and ground surface, base shear forces, shear force distributions along the building height, maximum and permanent foundation displacements, and foundation rocking, plus the flooring lateral deflections and inter-story drifts. Additionally, the strain-compatible shear modulus and damping dependency on the cyclic shear strain were considered via the programmed hysteretic damping algorithm. The plastic moment concept was employed so as to assign the elastic-perfectly plastic model to the superstructure and its foundation.
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The cherry-picked earthquake excitations, viz, the 1999 Chi-Chi (Taiwan), and 2011 Kohriyama (Japan), were scaled by means of the widely-used response spectrum matching method as per the design response spectrum of a strong rock. The direct method of analysis was used for analyzing the soil-foundation-structure system in one single step without a need to separately analyze each part of the domain. In this research, the hardening plasticity-based soil constitutive model, named “hyperbolic hardening with hysteretic damping”, in conjunction with the two simple, conventional soil models, namely, the isotropic elastic with hysteretic damping model, and elastic-perfectly plastic Mohr-Coulomb with hysteretic damping model, were invoked in the three-dimensional coupled soil-structure numerical simulations using FLAC3D software. Since the soil, in general, is the weakest material, involved in the commonplace geotechnical engineering projects, a soil constitutive model would be able to rule the dynamic response of the system. The current study investigated the extent to which the choice of the soil constitutive models can impact the predicted seismic performance of a 20-story reinforced concrete moment-resisting building with a mat foundation considering the Seismic Soil-Structure Interaction (SSSI).