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Yu H.-H.,Guangxi Key Laboratory of New Energy and Building Energy Saving | Yu H.-H.,Guilin University of Technology | Wei C.-F.,Guangxi Key Laboratory of New Energy and Building Energy Saving | Wei C.-F.,Guilin University of Technology | And 4 more authors.
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2015

Pore solutions play an important role in the shear strength of soils. A series of shearing and microcosmic tests are performed on the samples saturated with NaCl solutions with different concentrations to investigate the effects of pore solution concentrations on the effective strength of clay. The experimental results show that the pore solution concentrations have strong effects on cohesion of samples. The cohesion decreases with the increase of pore solution concentrations. As the concentration approaches 0.1 mol/L, the cohesion decreases to below 0 kPa. The cohesion depends on the block effect of physical and chemical forces between particles on the interparticle sliding. The repulsion decreases with the increase of the pore solution concentration which makes the interparticle sliding more easily. Due to the development of real pore pressure in the samples, the cohesion decreases to below 0 kPa. The environmental scanning electron microscopy tests on the microstructures confirm that clays form flocculation in NaCl solution and form aggregation in water. ©, 2015, Chinese Society of Civil Engineering. All right reserved. Source


Lin X.-C.,Fujian Provincial Institute of Architectural Design and Research | Cheng Z.-G.,Northwest China Hydroelectric Investigation and Design and Research Institute
Wutan Huatan Jisuan Jishu | Year: 2012

Excel VBA is an object-oriented programming language with the characteristics of simplicity, practicality and powerful development function. So it was adopted effectively by vast engineers in numerous fields on data processing because of many advantages. On the basis of studying the correlative technologies of Excel VBA, we try to apply it to the data processing of magnetic surveying in the ground magnetic prospecting. We also design and programm the so-called "Processing system on ground magnetic datum" successfully. The application of the system in some magnetic prospecting projects shows the improving of work efficiency and decreasing of errors probability at present. Source


Fu X.-H.,Guilin University of Technology | Fu X.-H.,Fujian Provincial Institute of Architectural Design and Research | Wei C.-F.,Guilin University of Technology | Wei C.-F.,CAS Wuhan Institute of Rock and Soil Mechanics | And 3 more authors.
Yantu Lixue/Rock and Soil Mechanics | Year: 2013

Red clay is one of the special soils which contains cementing material. Compared with common cohesive soils, the strength characteristics of red clay are more complicated. Some direct shear tests are performed on the unsaturated red clay samples with water and propanetriol solution; and the experimental results show that the strength and cohesion of samples exhibit double peaks of strength increasing with the increase of solution content; while the internal friction angle does not change. Besides, the strength of samples diminishes obviously with the propanetriol solution instead of water. Based on Bishop's effective stress for unsaturated soil and the characteristic of pore distribution acquired by NMR tests, the impact mechanism of pore distribution characteristic on strength is discucsed, and a conclusion is drawn that pore distribution characteristic has much effect on strength of red clay samples. Source


Wu M.-B.,Fujian Provincial Institute of Architectural Design and Research | Yu Q.,Fujian Provincial Institute of Architectural Design and Research
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2012

Based on an engineering example, a supporting method for a mixed high slope, which has stone retaining wall on the top and permanent slope in the middle and deep excavation at the bottom, is indroduced. According to different working conditions and by using different parameters, calculations of excavation support at the pit bottom and permanent slope support on the ground (after the backfill of excavation) should be carricel out. Supporting structures should satisfy the requirements of both temporary and permanent slopes. Source


Li G.,Tongji University | Wei J.,Tongji University | Wei J.,Jiangsu Green Building Research Center | Zhang K.,Tongji University | Zhang K.,Fujian Provincial Institute of Architectural Design and Research
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2011

This paper presents a systematic approach to estimate the cable tension when flexural stiffness and flexibility support is taken into account. To estimate the cable tension accurately, a theoretical model considering flexural stiffness and flexibility support is formulated, and formulas for estimating cable tension and boundary conditions are obtained. When the flexibility support stiffness is infinite, the formulas are the same as the formulas when the influence of flexibility support is counted. Three experiments of flexibility support stiffness were conducted to verify the estimation approach, and the experimental results showed that when the flexibility support stiffness is small, the cable tension estimation deviated significantly from the actual cable tension, and that the formula considering flexural stiffness and flexibility support stiffness can estimate the cable tension accurately. Source

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