Shear Strength Properties of Organic Soil with Sand Column

This paper discusses the results of a series of direct shear test that were undertaken toinvestigate the behaviour of organic soil with granular soil column. The tests focused oneffect of diameter of granular column in organic soil. Water content of the organic soil waskept constant for all tests. It was 125% that is liquid limit value. Four different column diameters were used. Sand used in the test is poorly graded and passing the No. 5 sieve andretaining on sieve No. 40 sieve. Shear strength properties of the samples were determinedfrom direct shear test. Loading was performed under undrained condition. Test results showed that ratio of sand column area to organic soil (S/O) are an important factor effecting shear strength properties of improved organic soil

Deep tillage tool optimization by means of finite element method: Case study for a subsoiler tine

Technologies and computer capacity currently available allow us to employ design software and numerical methods to solve complicated problems in very wide disciplines of engineering. It is also important for researches in agriculture. This study focused on obtaining optimum geometry parameters of a subsoiler tine by using computer aided engineering (CAE) applications. A field experiment was conducted to determine draft force of the subsoiler. The results from the experimental study were used in the finite element analysis (FEA) to simulate stress distributions on the subsoiler tine. The maximum equivalent stress of 432.49 MPa was obtained in the FEA. Visual investigations and FEA results showed that according to the tine’s material yield stress point of 355 MPa, plastic deformation was evident. Based on the FEA results, an optimization study was undertaken to obtain optimum geometry parameters without the occurrence of plastic deformation. According to the optimization study results, the optimum parameters of the tine geometry and maximum equivalent stress of 346.61 MPa were obtained. In addition to this, the total mass of the tine was reduced by about 0.367 kg

A Study About Effect Of Soil Model On Slope Under Vibration Load

This paper presents the effect of soil material model on slope under vibration loading. Ahard consistency clay is assumed within an example slope profile with the height of 10m andangle 25 for the evaluations. The linear elastic, Mohr-Coulomb and hardening soil modelsare considered using 2D finite element method by dynamic analysis. The results indicate that the velocities evaluated by the soil models are within the safety limits and accepted for the design. The soil models almost perform same values for factor of safety (not for linear elastic)and velocities. This study is believed to be beneficial for the applications in practice