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  • In-situ testing study on shallow-buried large-span tunnel

    • 摘要:

      According to the forked engineering of Miaoya tunnel along Shanghai-Fuzhou expressway, the contents, technique and method of monitoring in shallow-buried large-span section of Miaoya forked tunnel are presented. Based on the measured data inside and outside the tunnel, such as the bolt axial force, concrete lining stress, ground vibration velocity and so on, the deformation and stress properties of surrounding rocks and supporting system are analyzed in addition to the blasting dynamic characteristics of ground. The in-time information is applied to guide tunnel construction and optimize the supporting system; and monitoring results are discussed in detail. The presented experience and data can provide references to the design, construction and research of similar tunnel engineering.

    • 作者:

      Li Liping;Li Shucai;Zhang Qingsong;Liu Tao

    • 刊名:

      Yanshilixue Yu Gongcheng Xuebao Chinese Journal of Rock Mechanics and Engineering

    • 在线出版时间:

      2007

  • Seismic response analysis of a CFST arch bridge: Considering structure-foundation interaction

    • 摘要:

      A viscoelastic artificial boundary was constructed to simulate radiation damping in a semi-infinite medium and the elasticity recovery capacity of the medium at the far field. The seismic response of a deck-type concrete-filled steel tube(CFST)arch bridge having a 430 m span was analyzed using the program ANSYS. Several forms of foundation were incorporated into the model. The results show that the natural frequency and the seismic response stress both decrease and seismic displacements become larger when considering the structure-foundation interaction. The seismic stresses in key cross sections change little, the stresses in the steel tube decrease less than 1% and the stresses in the concrete decrease 3.5%. The influence of rock to bridge's seismic response is greater than that of the concrete foundation itself. The dangerous cross-section of the lower chord is at the skewback, that of the top chord is at the point 3/8 distant from the skewback and that of the deck is at the span center.

    • 作者:

      Zhou Yong;Zhang Bo;Li Shu-Cai;Zhang Qing-Song

    • 刊名:

      Zhongguo Kuangye Daxue Xuebao Journal of China University of Mining and Technology

    • 在线出版时间:

      2008

  • Experimental study of blasting dynamic vibration of closely adjacent tunnels

    • 摘要:

      Bifurcation tunnel is one of the new types tunnels. Taking the project of Qishucao bifurcation as the background, the field experiments of vibration effects of rock masses in tunneling blasting have been done. Based on the measurement of waveforms of the vibration velocity in different distances away from the tunneling blasting sources in the working face of adjacent tunnel, blasting vibration analysis of concrete lining tunnel is described by analyzing the peak particle velocity and its main frequency, especially for the blasting dynamic characteristics of mid-board and its vibration velocity variation. The results of the tests and analysis show that: (1) the near-blast side of old tunnel is the strongest vibration zone and the radial vibration is the highest which has a regular varying character along the mid-board; (2) the seismic effect of cutting hole blasting is the most intensive and its intensity is about two times greater than that of the other two blast-holes blasting; (3) the main vibration frequency of concrete lining is mostly low frequency from 20 Hz to 95 Hz, the higher frequency is absorbed quickly. (4) the peak vibration velocity always appears at the vault or in the middle of the mid-board in the same testing cross-section of the old tunnel; the Sadoy's formula is not reasonable for the vibration prediction of particle vibration near the blasting face. In light of construction characteristics of the adjacent blasting, the control measures of blasting vibration are proposed; the presented research achievements have better applied to practical project; and satisfactory results are obtained.

    • 作者:

      Zhang Qing-Song;Li Li-Ping;Li Shu-Cai;Ding Wan-Tao;Hong Wei-Liang

    • 刊名:

      Yantu Lixue Rock and Soil Mechanics

    • 在线出版时间:

      2008

  • The development of fiber optic Bragg grating sensors and their applications to the mine water-inrush model test

    • 摘要:

      Fiber Bragg grating displacement, stress, seepage pressure and temperature sensors were developed based on Fiber Bragg Grating (FBG) technology. These sensors have the characters of small size, high precision, stable performance and reliable data-collecting which completely satisfy the need of the real-time date-collecting under the condition of water inrush. The sensors were pre-embedded in the key positions of the model, and the real-time monitoring for multi-field information was successfully realized through the entire process of water inrush. The experimental results not only reveal the precursory characteristics of mine water inrush, but also verify the validity and feasibility of these optical sensors in the water-inrush model test.

    • 作者:

      Feng Xian-Da;Li Shu-Chen;Li Shu-Cai;Li Li-Ping;Yuan Chao;Wang Jing

    • 刊名:

      Meitan Xuebao Journal of the China Coal Society

    • 在线出版时间:

      2010

  • One-dimensional mechanical behavior of granular material under high stresses(Part I): compression behavior

    • 摘要:

      Grain crushing occurs in granular materials when the materials are compressed at high stresses. On one hand, grain crushing induces the evolution of grain size distribution. The content of coarse grains decreases while the content of fine grains increases. On the other hand, the crushing of grains induces the conversion of energies. According to the law of the conservation of energy, one component of the work done by external forces is transferred into heat energy due to the friction between grains; and the other component is dissipated into grain crushing, which was estimated using the theory of surface physics in this study. A relationship between grain crushing amount ratio and void ratio was obtained based on the theories of fractal geometry. One- dimensional compression tests on sand were conducted and relevant test data were examined to verify the obtained relationship. It was indicated in this study that the obtained relationship can describe the influence of grain crushing on the compressibility of granular materials at high stresses.

    • 作者:

      Wang Zhe-Chao;Li Shu-Cai

    • 刊名:

      Yantu Lixue Rock and Soil Mechanics

    • 在线出版时间:

      2010

  • One-dimensional mechanical behavior of granular materials at high stresses (Part II): Creep behavior

    • 摘要:

      It is shown in both field and laboratory observations that the creep process of granular materials is accompanied by grain crushing. One-dimensional creep tests were conducted on sands. It is found in the tests that the amount of crushed grains increases with time at specified stresses; and the grain crushing rate is directly proportional to creep rate. Based on these findings, energy conversion in the process of grain crushing is analyzed; and the relationship between grain crushing rate and creep rate is obtained. It is concluded that the creep rate is directly proportional to grain crushing rate when granular materials are subject to creep at high stresses.

    • 作者:

      Wang Zhe-Chao;Li Shu-Cai

    • 刊名:

      Yantu Lixue Rock and Soil Mechanics

    • 在线出版时间:

      2010

  • The normalization process of the multi-field information from a coal mine water-inrush model test

    • 摘要:

      Based on the normalization algorithm whose transform function is linear, the multi-field information collected in a coal mine water-inrush model test such as displacement, seepage pressure, stress and apparent resistivity was mapped to values between zero and one in order to eliminate the differences of dimensions and value ranges. In this way the normalization curves of the multi-field information were described in the same coordinate system, which were contrasted with the original curves to analyze the changing tendency and relationship among different variables. It is found that seepage pressure, apparent resistivity and stress are the ideal information resources for water-inrush prediction; abnormal fluctuations of seepage pressure appeares long before the occurrence of water inrush; the apparent resistivity and stress increases suddenly before the occurrence of water inrush, and the apparent resistivity change earlier than the stress.

    • 作者:

      Li Shu-Chen;Feng Xian-Da;Li Shu-Cai;Li Li-Ping;Yuan Chao

    • 刊名:

      Meitan Xuebao Journal of the China Coal Society

    • 在线出版时间:

      2011

  • An innovation simulation method for flow state evolution laws of water inflow and inrush in course of tunnel excavation (Part I: Theories)

    • 摘要:

      Hydrologic and engineering geological conditions of underground engineering and mining are highly complex. Geological hazards, especially water inflow or inrush, often occur during constructions. In order to get an insight into flow state evolution laws of water inflow and inrush in karst regions, as well as the influence of tunnel excavation, a numerical simulation method was proposed with COMSOL Multiphysics. Three water flow laws, Darcy's law, Brinkman equations and incompressible Navier-Stokes equations, are coupled and linked with each other. Water pressure and velocity can be analyzed in the course of excavation, and it can be used for further study of risk control of water inflow and inrush. © (2011) Trans Tech Publications.

    • 作者:

      Xu Zhenhao;Li Shucai;Li Liping;Shi Shaoshuai

    • 刊名:

      Advanced Materials Research

    • 在线出版时间:

      2011

  • An innovation simulation method for flow state evolution laws of water inflow and inrush in course of tunnel excavation (Part II: Applications)

    • 摘要:

      In order to avoid heavy casualties and economic losses, and to get an insight into flow state evolution laws of water inflow and inrush in course of tunnel excavation, simulations were done with COMSOL Multiphysics. By coupling and linking different kinds of sub domain governing equations with boundary conditions and possibly initial conditions, three kinds of water flow state, Darcy's law for water flow in the limestone aquifer, Brinkman equations for fast fluid in the karst conduit; and incompressible Navier-Stokes equations for freely moving of water in the excavated tunnel, are interacted and coupled with each other. Water pressure and velocity were studied and analyzed in course of tunnel excavation. It is proved that there will be no disastrous water inrush when the seepage deformation of the karst conduit is small, and that it is of vital importance to protect and support the clastic medium of karst conduit, and to strictly guard against any change of the permeability of the karst fillings. © (2011) Trans Tech Publications, Switzerland.

    • 作者:

      Xu Zhenhao;Li Shucai;Li Liping;Shi Shaoshuai

    • 刊名:

      Advanced Materials Research

    • 在线出版时间:

      2011

  • RETRACTED ARTICLE: Application of sequential extraction analysis to electrokinetic remediation of chromium contaminated soil

    • 摘要:

      Electrokinetic remediation of chromium contaminated soil is affected by the species of chromium in soil. This work studies the extent of chromium migration and the speciation of chromium during the enhanced electrokinetic remediation process. Two lab-scale electrokinetic experiments were carried out to remediate chromium contaminated soil from a chromite ore processing residue (COPR) deposited site in the northeast of China, using two different solutions (0.2 mol/L sodium acetate and acetic acid buffer solution, 0.1 mol/L sodium citrate and citric acid buffer solution) as catholyte. Each experiment was conducted for 15 days under the application of a voltage gradient of 1.37 V /cm. After remediation, the extent of chromium migration in soil was determined. Speciation of chromium in soil before and after remediation was determined by sequential extraction analyses. The average removal efficiency of total chromium and hexavalent chromium (Cr(VI)) was 11.32% and 81.23% using 0.2 mol/L sodium acetate and acetic acid buffer solution as catholyte. When Using 0.1 mol/L sodium citrate and citric acid buffer solution as catholyte, 21.06% of the initial total chromium was removed and the Cr(VI) removal efficiency was 75.89%. The binding type of chromium with soil was changed from a more difficult extraction type (residual fraction and oxidizable fraction) to easier extraction types (exchangeable and carbonate fraction) after electrokinetic treatment using 0.1 mol/L sodium citrate and citric acid buffer solution as catholyte. © 2011 IEEE.

    • 作者:

      Li Shu Cai;Li Ting Ting;Li Feng Mei;Liang Li Li;Li Gang;Guo Shu Hai

    • 刊名:

      5th International Conference on Bioinformatics and Biomedical Engineering Icbbe 2011

    • 在线出版时间:

      2011

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