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Introduce the principles of Support Vector Machines, and indicate the broken zone thickness can be forecasted by four factors: rock strength, joint coefficient, buried depth and span length. The results show that Support Vector Machine (SVM) is a reliable method to predict broken zone thickness, and the predictive values agree well with the verify data.
Deformation monitoring of tunnel surrounding rock plays an important role in process of tunnel construction, which is also a important method of grasping surrounding rock dynamic information and ensuring stability in the period of tunnel construction. Prediction of surrounding rock displacement is the key method of changing support parameter design, estimating stability of surrounding rock primary...
Based on the similarity theory and the theory of model test, we simulate different opening rock fractures indoors. On account of Super-Micro cement with four different water cement ratios of 0.8, 1.0, 1.5, 2.0 under different water reducer and additive, the experiment is testing the passing rate of Super-Micro cement through the filter with diameters of 0.02mm, 0.05mm, 0.07mm. The test results indicate...
The project of Underground Water sealed Oil Tank in Huangdao district, in Shandong Province is taken for example in this paper, which is the biggest underground oil tank now in china. First, the discontinuities in the site of caverns were categorized. And the geological and shape characteristics of each type were respectively described on the base of practical surface investigation and deep seated...
In-situ stress is a natural stress existing in earth crust and isn't disturbed yet by mining, which is the fundamental force to cause deformation and failure in mining and other underground works. To study the stability of surrounding rock in the 8th mine of Pingmei group, overcoring technique with complete temperature compensation technique and improved hollow inclusion strain devices were used in...
The coal gangue by directly discharging and accumulating has seriously destroyed the ecological environment and has been one of big obstacles for coal mines. Based on the green mining theory, the total three influential factors to destruct environment by gangue hill are researched, and a set of technology with gangue backfilling and complicated coal pillar resource mining is put forward. Meanwhile,...
In order to sustain the safety and stability of underground working drifts under blast vibration, Blastmate III is employed to test blast vibration in Tongkeng Mine, Guangxi, China. Combined with Sadaovsk formula, the stability of underground drifts is evaluated using comprehensive coefficient method. The maximum explosive quantity of single blasting adaptable for different comprehensive coefficient...
In this paper, Yushenfu mining area is taken as an example. On the basis of analysis and research of formation mechanism of mining subsidence, using principal component analysis and grey correlation analysis method, factors which affect the damage degree of mining subsidence have been selected. It is determined that disturbance coefficient, the ratio of width to depth, comprehensive hardness of overlying...
land use is the main human disturbance to accelerate the soil erosion. According to the land use types of the Hengduan mountainous region in the Eastern Tibet, this paper discussed the influence of the land use on the soil erosion type, erosion intensity and erosion spatial distribution. It indicated that the soil erosion types changed accordingly with land use changes. Freeze-thaw erosion and water...
Taking certain domestic highway with shallow rock stratum depth, developed Karst, short pile length of rock socketed pile and lower socketed depth as project instance, this paper further analyses on the typical pile foundation of above mentioned project, researches deeply about the effects to dynamic pile testing signal resulted by above mentioned features, and puts forward the pertinence measures...
Machangqing Cu-Mo-Au ore deposit is a typical deposit related to the Himalayan Epoch alkaline-rich porphyries along the Jinshajiang- Ailaoshan deep fault. From the rock body→ contanct zone→ wall-rocks, mineralization zones can be divided into Mo→Cu→Au, and the mineralization temperature cooled down as high→high-medium→medium-low→low. By the way of the geological age's studies, we discovered that alkaline-rich...
Spectral database plays a very important role in hyperspectral remote sensing research, the development of hyperspectral remote sensing make new demands on spectral database. Multi-dimensional database technology is the latest stage in the evolution of database technology.It has a wide range of applications in access and analysis large volumes of data. Hyperspectral image data have similarity with...
Researchers at home and abroad are mainly focused on the bearing capacity, effects of soil plug and pile driving of PHC pipe piles. However, little attention is paid to property variation of soil before and after their installation especially when different installation technology is adopted. For further study of engineering property of PHC pipe pile composite foundation, the property variation of...
An ultrasonic test of 8 groups of 24 concrete specimens with different admixtures under different loading conditions is completed and the research of the influence of admixtures on the correlation of stress and acoustic parameters such as ultrasonic velocity of concrete, weighted spectral area and so on are done. This research indicates that steel fiber and iron powder can increase the sensitivity...
This paper differentiated and analyzed the coupling mechanism of stress and fluid flow in fractured rock mass. It pointed out that the structural plane between the water and the rock mass is not only a physical medium in the process of water-rock coupling, but also a mechanical medium. Then a seepage model has been proposed, i.e. “water-rock-structural plane” model. This model can describe the seepage...
With the development of high-speed railway, more attentions have been paid gradually about the issue of vibrating of high-railway tunnel induced by high-speed train. Dynamic responses of railway tunnel under the vibrating load has been analyzed by finite element method through using the numerical simulation of vertical vibrating load induced by high-speed train with excitation function. The response...
With the increase of mining depth, the mechanical feathers and mechanical behaviors could become more and more serious in the complex mechanical environment of “three-high and one-disturbance”. The solid rock in shallow mining shows nonlinear mechanical characteristics of soft rocks while entering deep mining, such as large deformation, high underground pressure, difficult to support, etc. The rheological...
The construction of large metro station will generate a certain degree of ground settlement resulting in unfavorable effect on safety and stability of roads, underground pipelines and ground buildings in urban districts, and needed to monitor necessarily. Based on the geotechnical condition of the urban southern station of Changping metro line in Beijing, ground settlement of the foundation pit induced...
The grey theory and fuzzy theory combined assessment decision model were constructed for shan-meng expressway soft foundation treatment based on the grey theory and fuzzy theory, which considers the uncertain and fuzzy character of engineering geology, engineering cost, construction technique, effect of improvement and engineering reliability. The weights of affecting factor are calculated by improved...
To investigate the role and effects of the medium-grade phosphate rocks on Cu2+ removal in aqueous solution, three phosphate rocks (PRs) were selected from Hubei Province and the characteristics of Cu2+ removal were studied using batch experiment with phosphate rocks under different conditions in aqueous solution. The results showed: that the Cu2+ in aqueous solution was effectively removed by the...
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