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发育于花岗岩出露区的典型崩岗岩土受干湿效应影响,致使坡体在重力作用下产生崩坍,这是崩岗形成后最主要的侵蚀形式。通过对原状土进行5种干湿水平处理,采用直剪试验研究干湿效应下崩岗岩土抗剪强度及其指标变化规律。结果显示:从风干到增湿过程,抗剪强度及其指标衰减明显,粘聚力c下降幅度最大为92%,而内摩擦角φ最大降幅为48%。随着垂直压力递增,抗剪强度增大。此外,基于不同干湿效应下岩土抗剪强度指标变化规律,运用模糊综合评判法对不同干湿水平、干湿阶段崩岗坡体稳定性等级(重力侵蚀)进行评价,并讨论了完善该模型的途径,可为崩岗危害性分级、针对性治理提供技术支撑。
The typical collapse granite developed in the outcropped area of granite is affected by the wet-dry effect, causing the collapse of the slope body under gravity, which is the most important form of erosion after the collapse of the granite. Through the five kinds of dry and wet treatment of undisturbed soil, the shear strength of rock and soil under dry-wet effect and the change law of its index are studied by the direct shear test. The results show that the shear strength and its index decay obviously from air drying to humidification, the cohesion c decreases by 92% at the maximum, and the maximum frictional angle φ decreases by 48%. As the vertical pressure increases, the shear strength increases. In addition, based on the variation law of rock-soil shear strength index under different wetting and drying effects, fuzzy comprehensive evaluation method was used to evaluate the stability grade (gravity erosion) Model approach can be hazardous for the collapse of the gang, targeted management to provide technical support.