正常运行了十多年的窄巷口水电站的挡水坝,由一个承受拱坝坝体重量的基础拱桥和一个承受库水压力的拱坝组成。拱桥下面的河床复盖层没有被挖掉,坝基采用与拱桥联接的混凝土防渗墙防渗。防渗墙在库水压力下的稳定性主要取决于复盖层中的泥炭的抗剪强度。本文介绍有关泥炭的形成和力学性质,以及提高泥炭抗剪强度和确保防渗墙稳定的措施等。 The retaining dam of Niaokoukou Hydropower Station, which has been in operation for more than a decade, is composed of a basic arch bridge that bears the weight of the arch dam and an arch dam that withstands the pressure of the reservoir. The river bed cover below the arch bridge was not excavated, and the dam base was impervious to the concrete impervious wall connected to the arch bridge. The stability of the impervious wall under reservoir water pressure mainly depends on the shear strength of the peat in the overlay. This article describes the formation and mechanical properties of peat, as well as measures to improve the shear strength of peat and ensure the stability of the impervious wall.