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A foundation built on soft clay, silty clay with sludgy, reinforced with precast concrete piles (PCP) is designed, and studied using a finite element analysis program, Phase 2. The soil profile used for the design is representative of a Dalian soft clay profile, involving a more or less normally consolidated soil, with a strength and stiffness that varies linearly with depth. Such a profile is typical...
The efficiency of end bearing vibro-replacement stone columns in reducing the settlement of a multipurpose utility tunnels foundation system is designed in this paper. The foundation system is designed to consist of a large number of regularly spaced vibro-replacement stone columns of unequal length installed in a weak soil layer (stratum includes plain fill, silty clay including mire, clay, cobble,...
The concentrations of black carbon (BC), total organic carbon (TOC) and polycyclic aromatic hydrocarbons (PAHs) have been determined in soils from urban and rural areas of Beijing. The rural area can be divided into plain and mountainous areas which are close to and relatively far from the urban area, respectively. Concentration of BC (5.83±3.05mgg −1 ) and BC/TOC concentration ratio (0.37±0...
Preferential flow plays an important role in the movement of soil water. Dye tracer experiments and computer image analysis were used to analyze morphological and distribution of preferential flow paths under different land uses (forest land, shrubs land, and farmland). The relationships between the preferential flow paths and root lengths, root holes and root surface area were analyzed by Pearson...
The applicability of microwave irradiation in the removal of polychlorinated biphenyls (PCBs) from the soil heavily contaminated by capacitor oil was studied. Granular activated carbon (GAC) was added into the soil as a microwave-absorbing material to rapidly increase the temperature of the reaction system. Effects of sodium hypophosphite (SHP) and iron powder (IP) as reductants on PCB removal, as...
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