人工高切坡的长期强度指标研究

Study on Long-term Strength Index of High Cut Slope

高切坡的长期强度指标是研究其长期稳定性的关键,而影响人工高切坡长期强度的因素较多,但在工程寿命期内,主要以开挖卸荷和雨水入渗两种因素为主。以损伤理论为基础,分别定义了开挖卸荷引起的岩土体损伤和雨水入渗引起的岩土体损伤,研究了考虑损伤后岩土体的长期抗剪强度指标问题。通过工程实例的分析,结果表明:理论模型计算的高切坡长期强度与常规强度折减方法的预测结果一致的,可用于对人工高切坡长期稳定性的预测。

The long-term strength index is the key parameters to study the long-term stability of high cut slope. There exist many factors affect long-term strength of high cut slope. However, the cut unloading and the rain infiltration are the main affect factors. Based on damage theory, the damage of rock and soil which is caused by cut unloading and rain infiltration separately, has been defined. And the long-term strength index after damage is also stydied. Throngh an engineering case analysis and comparison between the computed data using the proposed theory and general strength reduction method, the results have shown that the theoretical model is feasible, and can been used to predict the long-term stability of high cut slope.