Study On Change Of Soil Properties During Dry And Rainy Seasons For Stability Analysis Of Bengawan Solo River Embankment

Satrya, Trihanyndio Rendy (2018) Study On Change Of Soil Properties During Dry And Rainy Seasons For Stability Analysis Of Bengawan Solo River Embankment. Doctoral thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

The soil properties generally change due to change of water content. In particular, change of soil properties in river embankment, that always experiences water level fluctuation throughout the year due to the cycles of the dry and rainy seasons. The river embankment, that had been built by dredged material from riverbed, tends to fail along the Bengawan Solo river, Indonesia. The embankment soil was classified as inorganic clayey silt with low plasticity (CL) and grouped as medium expansive soil. High river water level fluctuation and excessive rainfall during the rainy season might become one of the reasons of soil properties changes. This research is aimed to investigate soil properties relationship between in-situ and laboratory investigations and to investigate the influence of soil properties changes due to cyclic drying and wetting processes on slope stability. The physical and mechanical soil properties change due to the cyclic drying and wetting were investigated from the fresh Proctor compacted and remolded in-situ initial conditions. In-situ soil properties were measured at two-week interval time for 4 months. Soil properties changes of in-situ investigation are strongly related to those of fresh Proctor compacted on 2nd and 3rd cycle of drying and wetting. Both dry density and undrained cohesion highly decreased from 1st to 2nd cycle, then slightly decreased from 2nd to 3rd cycle. The hysteresis of those properties from 1st to 2nd cycle is greater than those from 2nd to 3rd cycle. Sensitivity analysis result showed that cohesion change was the most influential soil property in unsaturated slope stability equation, therefore cohesion change was introduced in those equation. Safety factor considering cohesion change is decreased from 1st cycle to 2nd cycle, then it is nearly constant from 2nd to 3rd cycle of drying and wetting. It is thought to be due that in-situ soil properties changes might be simulated using laboratory investigation. River embankment stability is somewhat more accurate if considering the cohesion change.

Item Type: Thesis (Doctoral)
Additional Information: none
Uncontrolled Keywords: Bengawan Solo river, river embankment, clayey silt, drying-wetting cycles, soil property change, unsaturated slope stability.
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA455.S6 Soil (Materials of engineering and construction)
Divisions: Faculty of Civil Engineering and Planning > Civil Engineering > (S3) PhD Theses
Depositing User: ansi aflacha
Date Deposited: 03 Dec 2018 07:17
Last Modified: 03 Dec 2018 07:17
URI: http://repository.its.ac.id/id/eprint/60068

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