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Abstract Donghekou landslide is a typical rapid and long run-out landslide located in Qingchuan County triggered by the 2008 great Wenchuan earthquake. It starts from the elevation of 1 300 m and causes 780 deaths，with a total long run-out of 2 400 m. This landslide is composed of limestone and dolomite limestone of Sinian system，carbon slate and phyllite of Cambrian system. Field investigations indicate that as for the Donghekou landslide，the microstructure and macroscopically mechanical property of the rock on sliding mass play an important role in the starting-up of the landslide under the action of earthquake. Therefore，by using the ORTHOPLAM microscope，the RMT–150C rock mechanics testing system and the 600 kN hydraulic universal testing machine，a series of tests have been carried out to study the microstructures and mechanical properties，such as the tensile strength，the compression strength and the shear strength of rocks from Donghekou landslide. The microstructure test results show that the mineral component of rock samples is very complex，and most of the rocks have experienced more than two deformation and metamorphic processes. And the mechanical test results indicate that water is an important factor for the mechanical properties of rocks，and the tensile strength，the compression strength and the shear strength are different at the dried state and saturated state. At the same time，the structural plane also plays a significant role in the mechanical properties of rocks.
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Received: 10 April 2009
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