By synthetic studies of the data obtained from the polaring microscope determita-tion, chemical analysis, differential thermal analysis, thermo-weight analysis, X-ray powder analysis and electron microscope observation and so on the substances composition of a weak interbed occurred in the dam foundation is determined to be mainly the quartz and sericite. The clay minerals are sericite and illite, as well as kaolinite and meta-halloysite.The detailed survey has been carried out for studing the occurrence, thickness and structural features of the weak interbed. Its engineering geologic characteristics, such as the physical, mechanical and hydro-physical properties have been determined in the laboratory. Moreover, the structure analysis of rock foundation with the weak interbed has been also made using the stereographic projection.On the basis of complex analysis of the above mentioned informations the influence of such weak interbed on the sliding and permeability stabilities is evaluated in this paper.
. 1975, “软弱夹层”对坝基岩体稳定的影响. 地质科学, 10(3): 265-278.
. THE INFLUENCE OF WEAK INTERBED ON THE STABILITY OF ROCK MASS OF DAM FOUNDATION[J]. Chinese Journal of Geology, 1975, 10(3): 265-278.