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This paper addresses the problem of damage monitoring system for buried ductile steel pipeline subject to earthquakes. To determine the capacity of a pipeline to perform its mechanical functions face to occasional or incidental damages, such as earthquakes, it is needed to evaluate the structural integrity of pipe and to track relevant environment parameters. This may be performed through intelligent...
Rapid economic developments have forced power networks and pipeline networks to share the same pathway. Induced voltages and currents appear on pipelines running parallel with high voltage transmission line when the transmission line is hit by lightning strike. In this study, a simulation had been carried out to determine the first lightning stroke effect on an underground pipeline coating stress...
This paper is devoted to discrete-continual method of analysis of coupled system “plate-soil foundation” in context of microseismic and gravitational processes in foundation. This method is called discrete-continual because it presupposes finite element approximation with respect to space coordinates while corresponding problem remains continual in time. This reasonable combination of numerical and...
The anchored sheet pile is a relatively new structure fonn, whidt is suitable for large civil engineering because of its short construction time and less materials consumption. However, since the stress state of the anchored sheet pile is complex, and diJTicult to calculate, this structure is limited in use. In order to understand the stress and defonnation characteristics of the anchored sheet pile,...
This paper simulated the dynamic changes of the Instantaneous Water Use Efficiency (WUEI) of leaves by constructing a coupled model related to net photosynthetic rate (Pn) and transpiration speed (Tr) of apple trees under different moisture conditions. Model parameters were determined through the potted apple tree experiment under gradual drought conditions (Malus domestica Borkh. cv. Fuji). Numerical...
The projected growth of loess ground deformation obeys the laws of hereditary creep theory. The defining equation in increments of stress is given based on the finite element method and the step method. An algorithm for solving the strain-stress state base of the definition of objectives taking into account the elastoviscoplasticity is suggested. The results of the numerical experiment for a flexible...
Every day petrochemical activities, spills, and leaks in the storage pipes contaminate the soil. For example, if a spill occurs or there is a leak of a pipe near where there is a building, the mechanical properties of the soil can be affected, causing economic problems or, in extreme cases, loss of life due to lack of stability in the structure. It is possible to take decisions if we know the behavior...
After the reinforcement of dam stability is very important. The stability analysis is carried out on the section of the dam, analysis of reservoir slope based on strength reduction method. The Phi-c reduction process gradually reduced the strength by using the finite element equilibrium equation to calculate the shear strength parameters. The most dangerous slip surface of dam slope is obtained until...
The domestic and foreign research on the water level change of the channel scheduling involves many aspects at present. The water level fluctuation has an imortant influence on slope stability. In the process of water level fluctuation, the change of soil state from unsaturated to saturated and other problems which should be taken into account in the analysis of slope stability. A typical slope in...
Plants may encounter drought stress frequently during their life cycles. In-depth studies of dynamic changes of stomatal conductance (Gs) under drought stress have important significance for understanding plant transpiration and fruit orchard irrigation. By constructing a photosynthesis-stomatal conductance-transpiration coupled model, the Gs dynamic changes of potted apple tree leaves under drought...
Due to the durability and sustainability, concrete pipes have been widely used in many water management systems. As they are buried underground, several factors such as soil and pipe properties, installation strategies, functional and external loads may involve in determining their failure and service life. In this study, we investigated the effects of such factors on the stress distribution of a...
The relation between a growing root and the soil movement has often been under-estimated. The present work aims to determine how grains in granular soils are reorganized by the action of growing roots, and in turn how the resulting forces acting on root tips modify their development. For this purpose, we have developed a 2D Discrete Element Model (DEM) able to compute a numerical growth of a single...
Field experience indicates that cables buried in soil either directly or in a non-metallic pipe can be at risk due to nearby lightning strike to ground. The triggered lightning experiments provided valuable quantitative information on the subject. There are many questions posed by these observations which motivated a detailed analysis of the electric stress on the cable jacket/sheath, the outer water...
On the issues of the pile nondestructive detection accuracy influenced by defect position and size, the torsional vibration calculation model is put forward based on one-dimensional wave theory. In the same pile parameters and exciting force, the testing performance is discussed about small defects and shallow defects by using torsional wave and longitudinal wave. The experiments verified that torsional...
Iron stress could pose a great threat to plant physiological processes and food security. Hyperspectral remote sensing is an important technology for stress monitoring of crop because of its rapid, nondestructive and macro-scale detection ability. In this study, maize seeding was taken as an example to study its chlorophyll change and spectral response under different iron concentration. The result...
Based on the triaxial tests on a new triaxial apparatus under realistic confining pressure and different amplitudes of dynamic stress, the residual strain of silty clay is studied which considered the effects of different dynamic stress. Results show that the residual strain of silty clay increases with increasing cycles of loading. The developing model of residual strain shows that it increases dramatically...
With water shortages and drought affecting many regions of the world, it becomes urgent to increase water use efficiency (WUE) by optimizing irrigation schedule. Proper irrigation scheduling, which includes integrating of soil moisture monitoring, surface evapotranspiration loss calculation, and plant based measurements is required for high WUE. Stem water potential (SWP) has become one of the more...
Obtaining precise information regarding the levels of heavy metal stress in crops is vital for food security. The assimilation of remote sensing into the World Food Study (WOFOST) model provides a method for achieving the spatial–temporal evaluation of crop growth status, while the optimization of the temporal scale in assimilation framework has rarely been considered. In this study, the temporal...
This paper focuses the development of a three dimensional numerical model to simulate the behaviour of geocell reinforced sand using PLAXIS 3D. Numerical modeling of the geocell has been an immense challenge due to their curved shape. Most of researchers used equivalent composite approach (ECA) to model the geocells. However, the composite method has a number of limitations, including the disregard...
Mud aggregates, or flocs, coexist with methane hydrate within sandy layer of turbidite, deep under the seabed. Flocs can break up with the water flow caused by hydrate dissociation, which is a serious issue to be considered for stable long-term production of methane hydrate. However, few research has been made on mud flocs consolidated under the seabed. Therefore, we have designed an experimental...
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