Reinvestigation on the Liquefied Sites in the Tangshan Earthquake

Abstract eng:
Liquefaction is one of the typical damages in earthquakes. The liquefaction area in Tangshan Earthquake in China on July 1976 has reached to 2400 KM2, accompanied by a large-scale ground settlement, deformation, sliding, sand boiling and severe damages of the buildings, roads, farmlands and bridges. Some researchers have made a detailed in-site investigation on the liquefaction damages and took testing of liquefied sites during 1977 to 1979. The obtained data have been used to develop liquefaction criteria of Chinese seismic code. However, the testing equipments employed then are limited in the function. Moreover, with the changing of geological condition after 30 years, the present scene is also an interesting question which needs to be answered. On July 2007, we go to the liquefaction sites of Tangshan Earthquake and investigate the scenes again. 23 testing boreholes are selected to conduct SCPT and Vs testes by using international advanced equipments which are quite different with those 30 years ago. the work in the paper is: (1) Analysis of the geological circumstance; (2) Testing of soil samples for learning the physical properties; (3) Comparing the historic and present information, the factors of tip resistance and friction resistance have been given; (4) Comparison of the liquefaction possibility by the seismic code using the new data with the original situation and explanation of the possible difference; (5) Prediction of liquefaction for the present circumstance by using the new methods.

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