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Fuzzy clustering analysis is an effective mathematical classification method. ISODATA clustering analysis method is more scientific, which can eliminate human error. With the help of ISODATA clustering analysis, we can classify the monitoring points more accurate, scientific with the classification of the slope by the direct factor in affecting the stability of the foundation pit, which improves efficiency,...
Vertical distribution of diverse available heavy metal elements in vegertable soil profile ( 0 ~ 2m ) was studied with different extractants. The results indicated that the content of available heavy metal in soil decreased with the increase the depth. This regularity adequately showed that the external factors were the important resources of available heavy metal, for example the atmospheric deposition,...
Based on soil dynamics and structural dynamics theory, a danymic model of frame structure with pre-stressed anchors for the slope is proposed, seismic response of a supporting slope was obtained under the condition of horizontal earthquake excitation. According to horizontal slice method, and the influence of slope height on seismic soil pressure distribution is considered. The soil pressure acting...
In this paper, it has been studied accounting of natural disaster reduction activities. It defines the characters and scope of natural disaster reduction activities, discusses the distinction from environmental protection activities. And natural disaster reduction activities are divided in this paper, which to define the structure of natural disaster reduce industry. Finally, it constructs the framework...
Because of the complex in calculating with coefficient Ø in P-III frequency curve and the difficult in planning with normal probability paper in existing frequency computation, so excel cannot be applied directly to the frequency computation. Plan the normal probability paper in existing frequency computation using the the formidable graph function of Excel software, calculate the coefficient Ø in...
Based on soft soil foundation treatment, the design method and construction parameters of static-dynamic drainage consolidation to treat the soft soil foundation is discussed. Through the data analysis of test and experiment, the results show that the drainage consolidation method of combining static and dynamic is useful to treat soft soil foundation. This research results provide value references...
In this paper, the excavation work of deep foundation pit for Qingdao subway is proposed. By construction numerical analysis, the characteristics of internal force of bracing system and soil horizontal displacement are obtained. Through these analyses, the law of horizontal displacement in ambient soil is obtained, and the measures considering the construction factors can be adopted for the support...
LUCC research is the focus of the study of entironment change, according to statistical and survey data, land use survey data and TM imagines from 1982 to 2008, analyzed the dynamic changes of LUCC in ShangHuang experiment area during the last 27 years. Based upon which, the major driving forces that influence the changes of land resources are discussed. The results indicated that throughout the study...
Based on the fact that severe water erosion is mainly caused by a few torrential rains of the year, this paper derives relationship between runoff velocity variations, energy increase in per width runoff and runoff concentration caused by nonuniformity of slope, with mechanical analysis of the main dynamic, surface runoff on the slope. The result shows that the value of energy increase in per width...
In this paper, we studied the influence of different concentrations of chlorothalonil which was commonly used in North China, on the activities of soil invertase, catalase and urease. The results showed that the influence trend of chlorothalonil at different doses on soil enzyme activity was almost the same. For soil catalase, it showed significant activation. For soil urease, it showed stimulation...
Soda residue is the industrial waste materials occurring during producing the pure alkali by ammonia soda process, it also can be used in the reclamation project after the research on its engineering characteristics. In the construction, the soda residue is pumped through a pipe and then is disposed by vacuum preloading method and so on. During pumping the soda residue, the pumping pressure, the pipe...
Based on the engineering experience of South Africa “Strong Foundation and Thin Pavement”, this was used in the Liaoning coastal highway construction. Fite element modeling was used to study the change of the asphalt pavement design parameters when the subgrade with high modulus, and suggests the reasonable asphalt pavement struction of subgrade with high modulus. Results indicate that subgrade with...
Facing is significantly important for stability of soilnailing wall. However present checking calculation methods is not appropriate for the facing. Based on the assumption of elastic foundation beam, Synergistic effect model of the facing and soil nail and soil is set up. The formula to calculate the internal forces of facing was worked out by use of finite difference method and boundary conditions,...
Based on a practical engineering project, which uses composite foundation with CFG (long pile) & gravel piles (short pile) to deal with the soil liquefaction in Inner Mongolia, the composite foundation's capacity and resist liquefaction ability are analyzed in the paper. Furthermore, the design and test results of the composite foundation with CFG & gravel piles are also discussed. Above conclusion...
The Chinese traditional folk-house provides a basic comfortable living-space for people since long time. The article focuses on the ecological strategy of choosing site in traditional folk-house. Base on a great deal of literature and examples, the author concludes some strategy from different angles, such as orientation, soil, water, wind, plant, topography and so on. Then, the article gains the...
Seasonal changes in the fine-grained soil conditions caused by the freeze-thaw cycle of their physical and mechanical properties of the changes to the actual construction harm. Through indoor uniform orthogonal test explore and study the fine-grained soil in different water content, density, soluble salt content and clay content conditions, the different cycles of freezing and thawing, use direct...
In this paper, we studied the effects of three fungicides (ehlorothalonil, mancozed and propamocarb hydrochloride), which were commonly used in north of China, on the activity of greenhouse soil enzyme. It was shown that ehlorothalonil, mancozed and propamocarb hydrochloride had insignificant effects on sucrase and urease activities at concentration of 10 mg·kg-1 and 50 mg·kg-1, while they had significant...
When vibroseis substrate interaction with the earth, There is a certain relationship and impact between surface of the visco-elastic medium and Vibroseis earth coupling. With the theoretical study of mechanical system model, it established the spring-damper mechanical system model. This article finded the vital parameters-Substrate quality, Elastic coefficient of spring and Damping coefficient which...
Uses the small shake table model experiment to confirm the mechanism of the liquefy sandy soil of has not reinforced and be marker reinforcement by the gravel pile, the key contrastive.
A ten-day interval of satellite data (NOAA/AVHRR) between 1981 and 2001 were used to investigate the Vegetation dynamic in Northern-Tibet Plateau (NTP), China. The relationships between NDVI and climatic parameters were analyzed in six counties of NTP. And the human activities factors such as population also tested in this study. The result shown that the prominent increase and decrease of NDVI occurred...
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