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陈村拱坝坝址地层为志留系太平组滨海相碎屑沉积岩,主要岩层为石英细砂岩、泥质细砂岩与砂质页岩三者互层组成。岩石层面倾向下游偏左岸。二岸岩石风化层厚,左岸风化程度比右岸更严重。坝基断层裂隙纵横,层间错动和挠曲破碎带、挤压破碎带发育,破坏了岩体的整体性。其中,F11断层自河床15坝块与F32断层交会点开始,向左延伸至7坝块下游面出坝基(见图1)。它不仅横贯河床和左侧大部分坝块基础,并横切整个左坝肩,既降低了
The site of the Chencun arch dam is Silurian clastic sedimentary rock in the Taiping Formation. The main rock strata are composed of quartz fine sandstone, muddy fine sandstone and sandy shale. Rocky slope tends to deviate left bank. The weathered layer of rock on the second bank is thick, and the weathered degree on the left bank is more serious than that on the right bank. The vertical and horizontal fault fractures of dam foundation, interlayered faults, flexural and fracture zones and crush and crush zone develop and destroy the integrity of rock mass. Among them, the F11 fault starts from the intersection point of the dam 15 and the F32 fault in the riverbed, and extends leftward to reach the dam foundation at the downstream of the dam (see Figure 1). It traverses not only the riverbed and most of the dam foundation on the left, but also the entire left abutment, reducing both