Hydro-Mechanical Properties of an Unsaturated Frictional Material
Hydro-Mechanical Properties of an Unsaturated Frictional Material
Hydro-Mechanical Properties of an Unsaturated Frictional Material
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Chapter 11<br />
Summary <strong>an</strong>d Outlook<br />
11.1 General<br />
In the following chapter the main results <strong>of</strong> the present study are summarized. Adv<strong>an</strong>tages<br />
<strong>an</strong>d disadv<strong>an</strong>tages <strong>of</strong> the testing devices <strong>an</strong>d equipment used for investigation <strong>of</strong> unsaturated<br />
s<strong>an</strong>d are given in detail. The results derived from these devices <strong>an</strong>d equipments are hydro-<br />
mech<strong>an</strong>cial properties <strong>of</strong> unsaturated Hostun s<strong>an</strong>d, which are also concluded. The influence<br />
<strong>of</strong> several conditions (e.g. initial condition) on the unsaturated hydro-mech<strong>an</strong>cial is given.<br />
<strong>Unsaturated</strong> hydraulic behavior was investigated in s<strong>an</strong>d column testing device I, that was<br />
simulated using MUFTE-UG. Two sets <strong>of</strong> parameters were used: i) a parameter set directly<br />
estimated from the tr<strong>an</strong>sient state s<strong>an</strong>d column test I <strong>an</strong>d ii) a parameter set derived from<br />
conventional test (steady state results from modified pressure plate apparatus). The main<br />
outcomes are given below.<br />
In case <strong>of</strong> a typical engineering problem, i.e. bearing capacity, the import<strong>an</strong>ce <strong>of</strong> consid-<br />
eration <strong>of</strong> suction in a soil was shown in the present investigation. As import<strong>an</strong>t key relation<br />
for prediction <strong>of</strong> unsaturated bearing capacity the soil-water characteristic curve is required.<br />
Results from experiments carried out <strong>an</strong>d the predictions are concluded.<br />
Finally future work for further investigation on hydro-mech<strong>an</strong>cial behavior <strong>of</strong> unsaturated<br />
s<strong>an</strong>d is proposed. This includes experimental investigations as well as theoretical investiga-<br />
tions on numerical simulations <strong>an</strong>d development <strong>an</strong>d improvement <strong>of</strong> models for describing<br />
hydraulic <strong>an</strong>d mech<strong>an</strong>ical unsaturated soils behavior (soil-water characteristic curve model,<br />
model for prediction <strong>of</strong> unsaturated stiffness, model for prediction <strong>of</strong> unsaturated bearing<br />
capacity).<br />
11.2 Testing Devices <strong>an</strong>d Equipment<br />
A newly developed modified pressure plate apparatus <strong>an</strong>d two column testing devices (s<strong>an</strong>d<br />
column testing device I, s<strong>an</strong>d column testing device II), which were additionally equipped with<br />
sensors for measuring water content <strong>an</strong>d pore-water pressure, are introduced in the present<br />
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