In this study, the correlation of evaluation items and safety rating for 104 of large-scale slopes along the general national road was analyzed. And, we proposed the regression model to predict the safety rating using the multiple regressions analysis. As the result, it is shown that the evaluation items of slope angle, rainfall and groundwater have a low correlation with safety rating. Also, the regression model suggested by multiple regression analysis shows high predictive value, and it would be possible to apply if the evaluation items of excavation condition and groundwater
The objective of this study was to identify the effect of engineering properties on the resilient modulus (M r ) of cohesive soils as subgrade. Eight representative cohesive soils representing A-6, and A-7-6 soil types collected from road construction sites, were tested in the laboratory to determine their basic engineering properties. The laboratory tests for the engineering properties were Atterberg limits test, sieve analysis, hydrometer test, Standard Proctor compaction test, and unconfined compressive strength test. Resilient modulus test and unconfined compressive strength test were conducted on unsaturated cohesive soils at three different moisture contents (dry of optimum moisture content, optimum moisture content, and wet of optimum moisture content). The increase in moisture content considerably affected the decrease
This paper presents laboratory test results analyzing the compaction and strength characteristics of Caliche (also known as calcrete or gatch) which is commonly used for road construction in arid or semi-arid region including Middle East area. Caliche material is easily ripped and crushed with excavating equipments at the borrow pit conforming the grain-size distribution specification, but the particles can be additionally broken down to finer particles due to slaking and compaction, and consequently bearing capacity would be dropped. The compaction and strength characteristics were investigated by performing grain-size analysis, compaction tests, and CBR tests. The compacted samples were soaked for as long as 400 days and tested in the lab in order to investigate the long-term behavior of Caliche material.
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