基于应变率的边坡岩体卸荷分带应用

The Application of Unloading Zones for Slope Rock Mass Based on Strain Rate

水电工程中大规模的坝基边坡开挖卸载导致岩体完整性显著降低,岩体力学性质劣化,由此产生一系列工程问题。边坡岩体卸荷带的划分有利于加深对边坡岩体质量的认识,有助于工程后续的设计和处理。本文通过分析卸荷分带常用量化指标,指出各指标可能存在的局限性,并探讨以卸荷应变率为指标的卸荷分带法在新疆QBT水电站坝区工程中的应用,依据水利水电工程地质勘察规范对卸荷分带法进行验证。结果表明:该方法具有良好的优越性和可操作性。

The large-scale excavation and unloading of dam foundation slope in hydropower engineering results in a significant reduction of rock integrity and deterioration of rock mechanical properties,resulting in a series of engineering problems.The division of unloading zone of slope rock mass is helpful to deepen the understanding of rock mass of slope and to the subsequent design and treatment of engineering.This paper pointed out the limitations of each index by analyzing the commonly used index of unloading zoning,and discussed the application of unloading zoning method with unloading strain rate index in the dam area of Xinjiang QBT Hydropower Station.The unloading zoning method was validated according to the geological investigation criterion of water conservancy and Hydropower engineering.The results showed that the method had good superiority and maneuverability.