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H. B. Poorooshasb
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Civil Engineering, Building, Construction & Architecture Engineering Transportation

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GROUND SUBSIDENCE CAUSED BY EARTHQUAKE TYPE EXCITATION H. B. Poorooshasb; A. Noorzad
Lowland Technology International Vol 1 No 2, Dec (1999)
Publisher : International Association of Lowland Technology

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Abstract

The extended CANAsand constitutive model, which incorporates the newly proposed concept of the "Compact State", is used in conjunction with the ID technique to evaluate the total subsidence of a sandy deposit. The ID technique is a simple numerical procedure developed recently. The results of the analysis clearly demonstrate the importance of the initial void ratio of the deposit, its permeability and the depth of the overburden on the magnitude of the subsidence of the layer.
SETTLEMENT OF STRIP FOOTINGS ON RECENTLY DEPOSITED TROPICAL COASTAL LOWLANDS H. B. Poorooshasb
Lowland Technology International Vol 3 No 1, June (2001)
Publisher : International Association of Lowland Technology

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Abstract

Many coastal lowlands are recently deposited. That is the soil layer consists of a thick layer of normally consolidated clay, silty clay, clayey silt or a combination thereof. In certain areas the deposit is so soft at the grade level that it cannor support the slightest of loads. In other areas, perhaps a few kilometers away from the shore-line, the surficial soils have become over-consolidated by desiccation and can support some load. These localities are, more often than not, of very gentle slope and carry scant vegetation. The layer supportng the crust (the desiccated soil) is still normally consolidated, highly compressible and its water content often exceeds the LL. Construction on such a formation obviously presents a serious problem and certain guidelines may be of value. It is the aim of the present paper to provide some such information. The discussions are limited to the performance of strip footing for low cost single story housing units.
INSTABILITY OF COASTAL LOWLANDS DUE TO SEISMIC ACTIVITIES H. B. Poorooshasb
Lowland Technology International Vol 5 No 1, June (2003)
Publisher : International Association of Lowland Technology

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Abstract

In certain regions of the world the coastal lowlands consist of a two to three meters of impervious material supported by a layer of sand and underlain by a thick layer of stiff marine clay. One such region is in the vicinity of the City of Bushire (Bushehr) located in the northern shores of the Persian Gulf. Here the top layer is a two to three meter thick coquina layer, resting on a very loose sand deposit of almost constant thickness (about 50-60 cm) having a gentle slope of about 5-10 degrees towards the sea. A sever earthquake in this region several centuries ago completely destroyed the City of Siraf which, at the time, was the most important port of the Persian Gulf on the Silk Route. The present paper presents an analysis of the situation using the CANAsand Constitutive Model and the ID technique proposed by the Author and his Colleagues at Institute of Lowland Technology, Saga University, Poorooshasb et al (1996).
NEW FINITE DEFORMATION MODEL FOR REINFORCED GRANULAR FILL OVER SUPER-SOFT RECLAIMED GROUND: I UNIFORMLY LOADED STRIP K. Ramu; M. R. Madhav; H. B. Poorooshasb
Lowland Technology International Vol 10 No 2, Dec (2008)
Publisher : International Association of Lowland Technology

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Abstract

The presently available models for the analysis of reinforced foundation beds on soft ground are based on the infinitesimal deformation theory. A new model, which is extension and modification of Madhav & Poorooshasb (1988) model is proposed to estimate the settlement response of a uniformly loaded strip on reinforced granular fill laid over a super-soft reclaimed ground and to estimate the mobilized tension in the reinforcement considering the hyperbolic stress–displacement response of the super soft soil, hyperbolic shear stress–shear strain response of the granular fill and finite deformation theory. The proposed model also considers shear stresses mobilized on the top and the bottom surfaces of the geosynthetic layer and relates them to the respective normal stresses. Results indicate that the infinitesimal theory underpredicts the displacements compared to those from the finite deformation theory. Parametric studies carried out quantify the effects of each parameter on the settlements along the reinforced foundation bed and tension mobilized in the reinforcement and facilitates design of footings on reclaimed ground.
Co-Authors A. Noorzad K. Ramu M. R. Madhav