112 research outputs found
Recent developments in comprehensive analytical instruments for the culture heritage objects-A review
This paper introduces the necessity and significance of the investigation of
cultural heritage objects. The multi-technique method is useful for the study
of cultural heritage objects, but a comprehensive analytical instrument is a
better choice since it can guarantee that different types of information are
always obtained from the same analytical point on the surface of cultural
heritage objects, which may be crucial for some situations. Thus, the X-ray
fluorescence (XRF)/X-ray diffraction (XRD) and X-ray fluorescence (XRF)/Raman
spectroscopy (RS) comprehensive analytical instruments are more and more widely
used to study cultural heritage objects. The two types of comprehensive
analytical instruments are discussed in detail and the XRF/XRD instruments are
further classified into different types on the basis of structure, type and
number of detectors. A new comprehensive analytical instrument prototype that
can perform XRF, XRD and RS measurements simultaneously has been successfully
developed by our team and the preliminary application has shown the analysis
performance and application potential. This overview contributes to better
understand the research progress and development tendency of comprehensive
analytical instruments for the study of cultural heritage objects. The new
comprehensive instruments will make researchers obtain more valuable
information on cultural heritage objects and further promote the study on
cultural heritage objects
Environmental geological features of the red clay surrounding rock deformation under the influence of rock-fracture water
The development degree of fissure water in underground rock is a great trouble to the construction of railway tunnel, which will cause a series of environmental geological problems. Take the surrounding rock-section of the typical red clay in Lvliang-Mt. railway tunnel below the underground water level as an example, several aspects about the red clay surrounding rock will be researched, including pore water pressure, volume moisture content, stress of surrounding rock, vault subsidence and horizontal convergence through the field monitoring. Taking into account the importance of railway tunnel engineering, the large shear test of red clay was carried out at the construction site specially and the reliable situ shear strength parameters of surrounding rock will be obtained. These investigations and field tests helped to do a series of work: Three dimensional finite element numerical model of railway tunnel will be established, the deformation law of the red clay surrounding rock will be investigated, respectively, for the water-stress coupling effect and without considering it, the variation of the pore water pressure during excavation, the influence degree about the displacement field and stress field of water-stress coupling on red clay-rock will be discussed and the mechanism of the surrounding rock deformation will be submitted. Finally, the paper puts forward the feasible drainage scheme of the surrounding rock and the tunnel cathode. The geological environment safety of tunnel construction is effectively protected
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