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In this paper based on the assumption of the isotropic elastic soil, Modified Winkler Foundation Model is established and a equivalent stiffness equation which considering the shear function of soil is derivated. The modified Winkler foundation model is compared with three other equivalent spring stiffness to study the sensitivity of the parameters. Pile-Soil interaction of FEA models are studied...
Based on the analysis of present research data of shallow tunneling, it was found that soil loss rate had different trends with the increasing of soil depth. The settlement formulas of deep soil of oval convergent model caused by shallow tunneling were deduced. Using stochastic medium theory to calculate practical cases, it was proved that with the increasing of soil depth, soil loss rate was not...
The work deals with the curing time effect on the mechanical behaviors of cement solidified dredged sediment (DS). For three DSs solidified by 100 kg cement per m3 sediment, unconfined compressive strength (UCS) tests, consolidated undrained triaxial compression tests were carried out. Test results show water content and failure strain decrease with the increasing of curing time, while UCS and deformation...
Four typical functional zones ,i.e. traffic zone, commercial zone, industry zone and residential zone were selected in Nanjing city for street dust sampling .In each zone and site, dust samples were randomly collected for five times. The total heavy metals were determined by atomic absorption spectrometry. And the concentration enrichment ratio (CER) was used to assess the degree of heavy metal contamination...
Influences of window function selection on the subsoil damping ratio of a massive concrete foundation is presented in this paper based on logarithmic decrement method in the time domain and point-peak method in the frequency domain. Little damping ration difference among smoothing curves of adjacent three point averaging, Hanning window and Hamming window is found both in the time domain and frequency...
Leaching transfer of herbicides was considered as the main control factor of the transfer conversion of pesticides in the soil-water environment. Using Black soil column, we studied the leaching transfer of Butachlor in Black soil. The experiment results showed that leaching amount of Butachlor and the depth of the highest value of butachlor content were in the soil positive correlation with the initial...
The behavior characteristics of sorption-desorption kinetics of imazethapyr in soil were studied with the batch equilibrium method, when the slight alkaline soil (Meadow saline Soil) and weak acid soil (Black paddy soil) was used as soil samples which had the similar organic matter content. It was shown that the adsorption and desorption of imazethapyr in soils can almost achieve equilibrium within...
The efficiency of electrokinetic remediation of Cu contaminated groundwater was researched by means of experiments for the complicated remediation of groundwater contaminated by typical heavy metal in this paper, and migration and variation characteristics of Cu was analyzed too. The experimental results indicated that the pH value varied obviously during the electrokinetic remediation because of...
The present work deals with the estimation of the average floc size of fine sediment particles using sedimentation data. Through particle size distribution tests of sediment under dispersion and flocculation situation, the criticle flocculation particle size was determined as 15μm. By theoretical analysis, floc sedimentation velocity formula was built based on the zero density flux at any cross section...
Along with the economy development and the industrialization progress quickly, watershed pollution in cities is growing seriously. It's difficult to achieve the goal of improving the water environment with the traditional water pollution control theory, as it's more emphasis on the end approach. Evolution of watershed relates to climate change, geological features, land use, animal changes, human...
Sedimentation column test is adopted to study the natural sedimentation rules of floatation full tailing and dredged sediment at storage yard. The study shows that, the double logarithmic coordinates of sedimentation speed and time could be used to divide the sedimentation process of tailing and dredged sediment into the stage of natural sedimentation and the stage of consolidation under deadweight;...
In order to solve the culvert structure large size,high cost and long construction time and culverts cracking problem and so on by the high filling culvert excessive earth pressure caused,a new load reduction test in site using different thicknesses and widths of EPS on the top and lateral slab culvert is done,The test results shows that: EPS slab can reduce vertical and lateral soil pressure acted...
This paper investigates the influence of soil-structure interaction (SSI) on seismic responses of long-span space truss roof. First, a three-dimensional (3D) integral finite element (FE) model of a typical regular pyramids space truss structure consisting of space truss roof and support columns is developed. By applying FE method for near field soil and infinite element (IE) method for far field unbounded...
The efficiency of electrokinetic remediation of zinc contaminated soils and the influence of complex EDTA were researched by means of experiment for the complicated remediation of soil contaminated by typical heavy metal in this paper, and migration and variation characteristics of zinc were analyzed too. The experimental results indicated that the heavy metal pollutant could be enriched and removed...
In order to study the stress path in soil element of ground under moving train load and the influence of moving speed, depth and the initial stress state of soil element on the stress path, the steady-state solution of stresses in ground were obtained based on the model of Euler beam on elastic half space under one moving load. The stress path in soil element under the load moving line was analyzed...
The one-dimensional consolidation of soft soil induced by water head difference between the top and the bottom of the soil layer was studied. One-dimensional consolidation equation expressed by water head under arbitrary datum plane was derived, and the general solution was obtained for arbitrary decline model of water table. Furthermore, for two simple models which are linear decline model and instant...
With the different parameters selection, Beta distribution can be transformed into various other distribution, ranging from simple distribution to complex distribution, from symmetrical distribution to asymmetrical distribution of the distribution. So Beta distribution is of highly adaptable, Beta Distribution is recommended to fit for the types of random variables distribution of Geotechnical Engineering...
Imazethapyr is used widely all over the world for the control of broadleaf weeds in the soybean field. However the serious problem of Imazethapyr has been remainded for long time. Bioremediation is an effective and economic method for the soil that has been polluted by pesticides. Used method of bottle cultivating, one strain of Imazethapyr degradable actinomyces S180 was isolated from the soil where...
An Unattended Detection method for monitoring the CO2 concentration in soil respiration is described. It is based on the gas pump and gas extraction with a dynamic air chamber assay, and the study of the relationship between data collected from on-line measurement of carbon dioxide and time, as well as the resistance to interfering. This method uses proposed utility line peak extraction method to...
Establishment of the optimal objective function is the first and a vital step for optimum design. The foundation pit engineering design is a procedure of multi-objective optimization and multi-objective decision. Some of these objectives can be quantitatively calculated, while others cannot. In order to make a comprehensive analysis of the effects of various factors on the optimum design of foundation...
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