关键词: 倾倒变形边坡, 工程地质分区, 破坏模式, 边坡稳定性评价, 扎拉水电站, 玉曲河

Abstract: It was required to evaluate stability and harmfulness of high toppling slopes that were widely occurred behind the plant house of Lazha Hydropower Station in Tibet, as they severely influenced layout of the dam site and buildings of the power station. We adopted comprehensive survey methods to study the geological characteristics of these toppling slopes, and proposed new geological zoning principle. An stability evaluation system of the toppling slope was established preliminarily by analyzing the slope failure modes through physical and numerical simulations, stability and falling calculations. Based on this, the engineers adjusted the site of power house, which ensures the safety of the project and the construction process and create a precedent that surge chamber was arranged in rock of the toppling slope.

Key words: toppling slope, geological zoning, failure mode, stability evaluation of slope, Zhala Hydropower Station, Yuqu River