2 Materials and methods
2.1 Sample description and
preparation
The tested samples were collected from the Wujiafen (WJF) landslide,
which was located at Zhuanfang village, eastern Chengdu Hi-Tech
Industrial Development Zone, Sichuan Provence, China. Similar to the
Leidashi (LDS) landslide in its 10° north by east about 2 km long. The
WJF landslide collapsed along a gently inclined bedding plane due to
heavy rainfall in August 2019 (Li et al., 2020). As the field
investigation showed (Fig. 1), a sandwich rock structure consisting of
red mudstone and argillaceous sandstone of the Triassic Penglaizhen
Formation was revealed in the left lateral scarp of the WJF landslide.
Intact mudstone and sandstone with slight weathering were sampled by
avoiding a soft interlayer (pressed in by the cutting ring) that was
parallel to the sliding direction. The physical and mechanical
properties of the rock samples in Table 1 were determined in laboratory
tests.