Archaeological investigation by geotomography: structure of the foundation of Yingxian timber pagoda |
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| Authors: | Rui Feng Wei-Zhang Yan Guo-Zheng Feng Yu-Lu Tao Hai-Nan Zhou and Xiao-Qin Li |
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| Institution: | (1) Institute of Geophysics, State Seismological Bureau, 100081 Beijing, China;(2) Seismological Bureau of Shanxi Province, 030002 Taiyuan, China;(3) Present address: Center for Seismological Data and Information, State Seismological Bureau, 100045 Beijing, China |
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| Abstract: | It is significant to take a non-destructive inspection, one of advanced techniques, for detecting the internal structure and
the present status of ancient cultural relics. The results detected by geotomography in Yingxian timber pagoda, Shanxi Province,
are presented in this paper. The embankment in the stepped foundation shows a three circular structure in horizontal: the
circular platform core is hard, homogenous and unharmed, out of which there are some radial collapsed grooves. The middle
circle with a thickness of 2 to 4 m is a compacted layer and its loading capacity decreases then. The outer protective layer
has a larger porosity and a weak loading capacity. An abnormal body is found out in the core, which has a circular shape and
a reverse high-absorption coefficient in the shallow part, but appears a long-band shape and a low-absorption coefficient
in the deep part. It might be a disturbance caused by artificial activities: the shallow part is probably a channel filled
with loosen soil and the deep part is a hidden cave. It is found that the foundation of the courtyard is homogenous and integrated.
Two soft and weakened areas in the north are related to the long-term run-off and drainage of groundwater. The inclination
of the timber pagoda to the northwest and northeast relates to several factors, such as the inherited subsidence of the northern
foundation, the lower loading capacity of the outer stepped foundation, seismic activity and timber deformation. |
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| Keywords: | Yingxian timber pagoda foundation detection archaeological investigation electromagnetic tomography resistivity tomography |
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