Abstract
Recently, mixtures of low-quality soil together with solidification materials, such as cement or steel slag, have been used for earthmoving construction. Solidification materials can improve consistency, shear strength, stiffness, and other parameters of low-quality soil by generating bonding forces between soil particles and changing grain size gradation. However, these solidification materials also contain chemical agents. In this study, simulations of rainfall infiltration into embankment constructed with the soil-solidification material mixture are conducted using the soil/water/air/soluble material coupled finite element analysis code, DACSAR-MP_ad. This analysis code can express not only deformation and seepage for an unsaturated earth structure but can also concurrently model the dispersing behaviour of soluble material. Herein, permeability and rainfall intensity conditions are provided and their effects investigated. Consequently, this study succeeds in expressing different distributions of soluble materials within embankment under different rainfall conditions.
Highlights
Construction waste soil may be used for constructing embankment
With a view to use steel slag as a solidification material for constructing embankment with low-quality soil, the effect of rainfall infiltration on a model embankment constructed with a soil and steel slag mixture was simulated
(1) The behaviour of infiltrated rainwater depends on rainfall intensity
Summary
Construction waste soil may be used for constructing embankment. Embankment consisting of such lowquality soil materials exhibits low stability under rainfall and in the event of earthquakes. The solidification material reacts with water contained in the soil and generates bonding among soil particles. When this happens, we can expect an increase in stiffness and a change in grain size gradation. A way to construct and to maintain embankment containing soluble soil materials without leaching is needed for the effective use of solidification material. The embankment model shown in Fig. was conducted using a mixture of soil with steel slag, and tests were conducted to monitor rainfall infiltration behaviour. PH obtained from the tank leaching test from the mixture of soil with steel slag is expressed as a dashed line of pH=12.4. Though a gradually decreasing trend with time after construction can be seen, rainfall
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