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Li R.,Xi'an University of Technology | Li R.,Shaanxi provincial Key Laboratory of Loess Mechanics and Engineering | Yan R.,Xi'an University of Technology | Liu J.,Xi'an University of Technology
Advanced Materials Research | Year: 2012

In order to analyze the damage mechanism of the reinforced concrete stabilizing pile, this article studies the seismic deformation of a reinforced slope without groundwater. Then, the breaking mechanism of stabilizing pile is studied by using dynamic finite element method. The results show that the slope deformation caused by the earthquake leads to the obvious increase of dynamic bending moments, and the bending moments eventually go beyond the ultimate strength moment of the reinforced concrete piles. © (2012) Trans Tech Publications, Switzerland.


Li R.,Xi'an University of Technology | Li R.,Shaanxi provincial Key Laboratory of Loess Mechanics and Engineering | Yan R.,Xi'an University of Technology | Li H.,Xi'an University of Technology
Applied Mechanics and Materials | Year: 2012

The earthquake often leads to the damage of stabilizing concrete pile. In order to analyze the damage mechanism of the reinforced concrete stabilizing pile, this article uses the developed concrete model piles, studies the seismic deformation of a slope reinforced with stabilizing piles and the dynamic broken damage phenomenon of pile by using the dynamic centrifuge model test without groundwater. The results show that the earthquake action leads to the obvious increase of dynamic excess bending moments, eventually results in the pile's breaking damage. © (2012) Trans Tech Publications, Switzerland.


Fan L.-M.,Xi'an University of Technology | Fan L.-M.,Shaanxi Provincial Key Laboratory of Loess Mechanics and Engineering | Zhao Q.,Xi'an University of Technology | Liu Y.-H.,Xi'an University of Technology
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2015

Some properties of SH waves in layered media are analyzed such as propagating path, reflecting cofficent and travelling time in order to improve the accuracy and efficiency of 1-D finite element method dealing with seismic response problem of horizontal layered site for inclined SH waves in time domain. Based on the Huygens wave principle, impedance interfaces are regarded as the secondary sources or wavelet sources, which are called interfacial wavelets. The relation between interfacial wavelets can be expressed as a group of time delay equations, and the motion of interfaces can be obtained by solving the time delay equations. The earthquake motion can be ascertained from surface wavelets. The new method is called an interfacial wavelet algorithm and demonstrated by two corresponding numerical models. When using this method, mesh divisions and artificial boundary conditions need no treatment so that computing amount and transmission errors between nodes are reduced greatly. It is very fit to solve seismic response in layered media. ©, 2015, Chinese Society of Civil Engineering. All right reserved.


Xiong T.-F.,Xi'an University of Technology | Shao S.-J.,Xi'an University of Technology | Shao S.-J.,Shaanxi Provincial Key Laboratory of Loess Mechanics and Engineering | Wang T.-M.,Chinese Railway the First Reconnaissance Design Institute Co. | Gao Z.-H.,Chinese Railway the First Reconnaissance Design Institute Co.
Yantu Lixue/Rock and Soil Mechanics | Year: 2010

For the Xi'an metro line No.2 passing through ground fissure active zones, the interaction mechanism between lining and surrounding rock was studied by the physical model test, stimulating the metro tunnel orthogonally crossing the ground fissure and being consistent with the settlement crack of lining structure, with geometrical proportion of 50:1. Test results show that the regularity of wall rock pressure, stress and uneven settlement of lining structure changing with the relatively vertical deformation are similar under the different stress fields for the case of the settlement crack being consistent with the orthogonal ground fissure in strata. The relative settlement between two sections of lining structure with deformation crack at ground fissure develops apparently with the relatively vertical displacement between upper strata above ground fissure and lower strata below ground fissure. The lining structure is of large settlement in the upper strata and small settlement in the lower strata. The additional stress of lining structure and increasing value of earth pressure acting on lining structure is small in the upper strata and large in the lower strata. The maximum value of additional stress and earth pressure locates at the section closing to the ground fissure. When the ground fissure being of largely vertical displacement, the wall rock pressure on the bottom of lining structure in the upper strata decreases obviously or equals to zero. It could point out that the research of physical model experiment has importantly theoretical and practical significance to the construction of underground engineering and maintenance operation in the area of ground fissure.


Yu Q.-G.,Xi'an University of Technology | Shao S.-J.,Xi'an University of Technology | Shao S.-J.,Shaanxi Provincial Key Laboratory of Loess Mechanics and Engineering | She F.-T.,Xi'an University of Technology | Zhang J.-H.,Xi'an University of Technology
Yantu Lixue/Rock and Soil Mechanics | Year: 2010

Based on the true triaxial apparatus of Xi'an University of Technology, the failure modes, intermediate principal stress influence on shear strength parameters and strength surface characteristics on π plane of Q2 loess with different water contents was analyzed under the condition of different intermediate principal stress ratio b and different meaning normal stress. It was shown that the failure modes of Q2 loess cubic samples behaved four kinds of failure formation, including of lateral bulge failure, taper failure, trapezoid failure, irregular hexagon failure by true triaxial tests. The shear strength parameters ratio could be got by comparing the strength parameters measured by true triaxial tests with the results of triaxial tests. The coherence ratio changes between 0.9 and 1.9. The friction angle ratio varies between 0.7 and 1.5. The structure property and failure formation of Q2 loess influence the shape of failure criteria on π plane. The consolidation pressure influence the value of failure surface in π plane. The shapes of Q2 loess failure criteria on π plane under different water contents and different consolidation pressures include pear-shape and irregular hexagon. With the structure property of Q2 loess reducing, the shapes of failure surface on π plane changes from pear-shape into irregular hexagon.


Shao S.-J.,Xi'an University of Technology | Shao S.-J.,Shaanxi Provincial Key Laboratory of Loess Mechanics and Engineering | Zheng W.,Xi'an University of Technology | Wang Z.-H.,Xi'an University of Technology | Wang S.,Xi'an University of Technology
Yantu Lixue/Rock and Soil Mechanics | Year: 2010

Loess structure is an important physical property, which influences mechanical properties of loess with its particle size, density and humidity. Based on the structure potential of loess released by loading, remolding and saturating, the unconfined compressive strength of intact, remolded and saturated loess were measured by uniaxial compression test; and the structural index of loess was defined by comparing the stability and changeability of loess structure which determined respectively by the ratio of confined compression strength of loess and remolding soil and the ratio of confined compressive strength of saturating loess and loess. Through the unconfined uniaxial compression test of four kinds of loess adopted from different sites, the unconfined uniaxial compression stress-strain curves of intact, remolded and saturated loesses with different water contents were tested to reflect the uniaxial compression stress-strain property, as well as the law of unconfined compressive strength and loess structural index changing with the water content was analyzed for different kinds of loesses. When the particle size, density and humidity of loess being similar, the greater the structure index of loess, the smaller the compressibility and the greater the shear strength of loess. So the structure Index structure together with the particle size, density and humidity can be used to describe reasonably the fundamental physico-mechanical properties of intact soils.

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