AVIC Geotechnical Engineering Institute Co.

Beijing, China

AVIC Geotechnical Engineering Institute Co.

Beijing, China
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Liu Y.,AVIC Geotechnical Engineering Institute Co.
WIT Transactions on Ecology and the Environment | Year: 2014

Iron ore mining has brought a series of ecological and environmental problems, including the most obvious one - land damage. Iron ore mine land reclamation can restore and rebuild the mine ecology, improve regional environmental quality, the establishment of a social, economical and naturally coordinated development of a mine, ecologically virtuous circle of green industrial ecosystem. Niu Xi River iron ore for its current land use, based on the "land reclamation technical standards" and other relevant standards and comprehensive study of area natural and socio-economic conditions, land suitability factors, the land reclamation countermeasures of Niu Xi River iron ore are given out. © 2013 WIT Press.


Lu P.,Jilin University | Lu P.,Changchun University of Science and Technology | Sun Y.-H.,Jilin University | Wang Q.-H.,Jilin University | Wu X.-H.,AVIC Geotechnical Engineering Institute Co.
Jilin Daxue Xuebao (Diqiu Kexue Ban)/Journal of Jilin University (Earth Science Edition) | Year: 2012

The thermal response test equipment with electric heat source merely test the refrigeration condition, and the test parameters was set by experience. Heat pump source thermal response test equipment can test both of the refrigeration condition and the thermal condition, the test result of this equipment showed that the output power of heat pump was stable under the T tube valve control. And the test power should be defined as 40-60 W/m in refrigeration condition and 35-45 W/m in heating condition. Test time should not be less than 48 hours and should be extended when the was less than 2.5%. Filed validation showed that thermal resistance of heat exchanging role was 0.08 (m·°C)/W, and the comprehensive thermal conductivity of 100 m depth stratum was 1.67 W/(m·°C) in heating condition, which can meet the needs of ground source heat pump system.


Ma C.,Tsinghua University | Ma C.,AVIC Geotechnical Engineering Institute Co. | Ma C.,CAS Institute of Geology and Geophysics | Li X.,CAS Institute of Geology and Geophysics | And 3 more authors.
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2011

The mechanical properties of jointed rock mass are closely related to its occurrence of stress state. None of the existing methods in obtaining representative elementary volume has taken the effect of confining pressure on representative elementary volume(REV) size into account. Based on certain road tunnel project, this issue is studied with 3D discrete element method in this paper. The dominant joint sets of rock mass are calculated based on a large number of joint surveys in our study area. Then, the structure model and 3D discrete element model of rock mass are built, which are further employed to simulate the compression test of rock mass, thereby employing the effect of confining pressure on REV size, deformation and mechanical properties of rock mass. The results indicate but not limit to the following conclusions: when confining pressure is less than 20 MPa, REV size is positively correlated with the increase of confining pressure; when the confining pressure is greater than 20 MPa, REV size keep constant; when the confining pressure is less than 60 MPa, the capacity of rock mass is positively correlated with the increase of confining pressure; when the confining pressure is greater than 60 MPa, the rock mass capacity did not change as the confining pressure increasing. In addition, the axial strain, lateral strain and volumetric strain also showed significant effect of confining pressure.


Liang C.,CAS Institute of Geology and Geophysics | Li X.,CAS Institute of Geology and Geophysics | Zhang H.,China Communications Construction Company Ltd. | Li S.,CAS Institute of Geology and Geophysics | And 3 more authors.
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2013

The static and quasi-dynamic tests on granite specimens under various strain rates are conducted by using rock dynamic loading system. The specimens are 50 mm in diameter, with the length of 50, 75, 100, 125 mm, respectively. The research results are drawn as follows: (1) Specimen strength is significantly dependent on strain rates and increases with the growth of strain rates with a power relationship. (2) Under static and quasi-dynamic loading conditions, rock strength generally decreases with the increase in specimen length. (3) When the diameter of specimen is 50 mm, the aspect ratio should be not smaller than 2; then steady test results can be obtained under different strain rates. (4) Peak strain under each strain rate decreases with increasing specimen size. (5) Both of secant modulus E50 and elastic modulus Et increase with increasing specimen size; and Et is larger than E50. (6) Failure mode is significantly dependent on strain rates and failure is serious when the strain rate increases. When strain rate ε̇ < 10-3 s-1, failure mode has a process of split failure-taper failure-shear failure; when strain rate ε̇ > 10-2 s-1, the failure mode changes from taper failure to shear failure directly.


Li T.,CAS Institute of Geology and Geophysics | Li T.,University of Chinese Academy of Sciences | Li X.,CAS Institute of Geology and Geophysics | Li S.,CAS Institute of Geology and Geophysics | And 3 more authors.
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2012

Landslide geohazards induced by underground mining at home and broad were summarized, and the current status of studies were analyzed. Common characteristics of these geological disasters were generalized. To reinforce the understanding of mechanism of undermining-induced landslides, taking Jiweishan Rockslide in Wulong for example, large-scale three-dimensional numerical model was built with the Continuum-based Discrete Element Method. The GPU technology that could accelerate the velocity of the circulations was used in the process of operation. Landslide failure process induced by undermining was modelled. The influence of rockslide stress field and displacement field caused by undermining were analyzed, and the formation mechanism and movement trend were investigated. The conclusions are as follow: the failure mechanism of Jiweishan Rockslide is part of the key block in front of the landslide collapsed, the sliding body at back of the landslide slided, and the karstificated belt was suddenly broken with shear rupture that had triggered the rockslide. Failure pattern was testified concretely with variation analysis of stress and deformation. This study shows that Jiweishan Rockslide was induced by underground mining.


Liang C.,CAS Institute of Geology and Geophysics | Liang C.,University of Chinese Academy of Sciences | Li X.,CAS Institute of Geology and Geophysics | Wang S.,CAS Institute of Geology and Geophysics | And 4 more authors.
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2012

The progressive failure of rock can be divided into five stages, including crack closure stage, elastic stage, crack initiation and stable growth stage, and accelerated crack growth and post-peak stage. The characteristic stresses in the progressive failure process of rock under different strain rates were studied by using the dynamic mechanical system of rock with changing frequencies. The results show that: (1) When the strain rate ε̇<5×10 -4 s -1, rock strength is slightly dependent on the strain rate; when ε̇>5×10 -4 s -1, the rock strength is significantly dependent on strain rate. (2) The ratios of crack initial stress and dilatancy stress to the peak strength and the ratio of crack initial stress to dilatancy stress are 50%-60%, 70%-80% and 80%-90%, respectively, showing no evident dependence of strain rate. Based on the energy conservation law, the energy characteristics and energy mechanism in the process of rock failure were analyzed. Some conclusions are dram as follows. (1) Both of the total absorbed strain energy and the elastic strain energy increase with the growth of strain rate; but the damage strain energy increases firstly and then decreases. (2) When ε̇<5×10 -4 s -1, the absorbed energy and the elastic energy are slightly dependent on strain rate; when ε̇>5×10 -4 s -1, the absorbed energy and the elastic energy are significantly dependent on strain rate. (3) If the strain rate is fixed, the strain energy absorbed by rock is stored mainly in the form of elastic strain energy, but the damage strain energy remains nearly unchanged, which only increases near the peak strength. Once the peak strength is reached, the strain energy stored in the rock is quickly released.


Liang C.,CAS Institute of Geology and Geophysics | Liang C.,University of Chinese Academy of Sciences | Li X.,CAS Institute of Geology and Geophysics | Li S.,CAS Institute of Geology and Geophysics | And 3 more authors.
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2012

To study the threshold value of strain rates between static loading and quasi-dynamic loading of rock materials, uniaxial compression tests of several hard-rock samples were conducted with various strain rates. Then, the correlation between the ratio of rock dynamic compressive strength to static compressive strength, λ, and strain rate was quantitatively analyzed using statistic theories and methods. The relationships between strength parameters of hard-rock samples and strain rate were obtained. Further, the threshold value of the strain rates of rock materials under static and quasi-dynamic loading tests were found. The results show that: (1) When the strain rate ε̇<5×10 -4s -1, the tests are static with λ around 1.00. It means that rock strength is independent of strain rates. (2) When 5×10 -4 s -1<ε̇<10 2 s -1, the tests are quasi-dynamic with a power relationship between λ and strain rates. It indicates that rock strength is significantly dependent of strain rates.


Wan F.,Beijing Jiaotong University | Tan Z.,Beijing Jiaotong University | Chen Y.,Avic Geotechnical Engineering Institute Co.
Beijing Jiaotong Daxue Xuebao/Journal of Beijing Jiaotong University | Year: 2013

Relying on engineering design examples, and by means of finite element analysis software MIDAS-GTS, deformation, internal stress and safety evaluation of existing tunnel are studied in condition of the two engineering programme, open surface buried method and subsurface excavation method. The results indicate that both of the open surface and subsurface excavation programme can be ok from the technical safety. But in comprehensive comparison, the open surface programme is recommended. Combining the results of numerical analysis with the engineering instance, reinforcement measures of the rock between the new tunnel and existing tunnels, design project of shotcrete rockbolt mesh during temporary slope excavation and monitoring program of new tunnels and existing tunnel in the process of construction are brought up.


Wang Z.,Dalian Ocean University | Sun Y.,China National Petroleum Corporation | Wang C.,Avic Geotechnical Engineering Institute Co.
Applied Mechanics and Materials | Year: 2012

As a newly developed type of foundation for deep water offshore and marine engineering, the suction caisson is usually subjected to combined loading of vertically uplift load, horizontal load and moment. Performance evaluation and design theory for such a new type of foundation can not meet the basic requirements of engineering practice sufficiently at present. In this paper, the general-purpose finite element analysis package ABAQUS is employed to conduct three-dimensional numerical analyses on load-carrying features of suction caisson foundation. Then the ultimate bearing capacity of suction caisson foundation under monotonic load for two drainage conditions of the soil is evaluated by displacing-controlling procedure. © (2012) Trans Tech Publications, Switzerland.


Geng H.,China University of Mining and Technology | Wu J.,AVIC Geotechnical Engineering Institute Co.
Applied Mechanics and Materials | Year: 2012

The mechanics model about submarine pipelines during installation is based on the theory of geometrical nonlinear great distortion. The U.L method is adopted as solving problem about the contact between submarine pipeline and seabed, the results obtained by this method are equally accurate and less computational work is need when solving pipeline's non-linear great distortion. According to select different original parameter during laying pipeline, the bend distortion to submarine pipeline is calculated and the effect of bend distortion to submarine pipeline is analyzed. © (2012) Trans Tech Publications, Switzerland.

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