Abstract
For the settlement computation of an embankment dam, the soil stiffness is of great importance. Unfortunately, due to the lack of funds allocated for geotechnical investigation, stiffness parameters are commonly not evaluated as compared to strength properties. As a result, this may create hindrance in the use of advanced constitutive models such as Hardening Soil Model (HSM). In this study, the settlement with respect to depth and long term settlement of an embankment dam computed with Mohr-Coulomb Model (MCM) is compared with that of HSM applied to foundation soil only with limited data on stiffness. The results show that the MCM overestimated settlement in comparison with HSM. The settlement increment of MCM, in comparison with HSM, at the crest and at the depth of 120m was 53% and 82% respectively after the filling of the reservoir. The settlement computed with MCM and HSM were 2.9% and 1.35% of the dam height. It can be interpreted that the settlement predicted with MCM is unrealistically high due to the single constant value of modulus of elasticity (MOE), while the predictions of HSM are in agreement with the literature. In addition, the long term settlement computed using MCM is about 59% higher than that of HSM for the condition after the filling of the reservoir. This paper shows that the settlement of an embankment dam could be predicted reliably by using HSM even when a limited number of stiffness data is available.
Highlights
In Pakistan, the construction of embankment dams is being given top priority to meet the shortage of electricity and water for drinking and irrigation purposes
The settlement with respect to depth response of the dam when computed with Mohr-Coulomb model (MCM) and Hardening Soil Model (HSM) applied to clay core, sandy gravel, random fill for the end of construction (EC) and after the filling of reservoir (AFR) are respectively given in Figures 5 to 10
Settlement with respect to depth and long-term settlement of an embankment dam were computed with MCM and HSM
Summary
In Pakistan, the construction of embankment dams is being given top priority to meet the shortage of electricity and water for drinking and irrigation purposes. The use of MCM for the computation of settlement is not considered reliable [7-8], since it does not include stress dependent stiffness, the settlement predicted could be unrealistically higher with respect to the depth of an embankment dam. In such a situation, it might be advantageous [9] to adopt advanced material models like the Hardening Soil Model (HSM) for settlement computations. Due to the limited available funding for geotechnical investigation, it might not be possible to conduct more detailed tests that could help in settlement evaluation This type of problem requires evaluating material properties of HSM from the available material parameters of Corresponding author: Amjad Hussain Bhutto www.etasr.com
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Engineering, Technology & Applied Science Research
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
