摘要
大量的工程建设项目存在高陡岩质边坡,在高应力环境下,岩石的蠕变特性是评价边坡长期稳定性的关键指标。为探讨深层高应力条件下岩石的蠕变特性,本文采用分级加载的方式对高陡岩质边坡深部砂岩进行三轴蠕变实验。研究表明,在高应力环境下,硬岩也呈现出典型的蠕变特性,基于损伤理论,引入一个非线性黏塑性体元件,提出一种改进的Burgers模型来描述深部砂岩的蠕变本构特性。通过数据拟合对比,验证改进的Burgers模型的正确性和适用性。研究结果为高地应力条件下的工程建设提供了有效的基础资料和参考依据。
High and steep rock slopes exist in a large number of engineering construction projects. Under high stress environment, rock creep characteristics are the key index to evaluate the long-term stability of slopes. In order to explore the creep characteristics of deep rock under high stress condition, the triaxial creep test of deep sandstone of high and steep rock slope in mine is carried out by means of graded loading. On the surface, hard rock also exhibits typical creep behavior under high stress environment. Based on the damage theory, a modified Burgers model is introduced to describe the creep constitutive behavior of deep hard rock. The correctness and applicability of the modified Burgers model were verified by data fitting and comparison. The research results provide effective basic data and reference basis for engineering construction under high ground stress condition.
作者
李延福
段顺荣
张地
谭维佳
Li Yanfu;Duan Shunrong;Zhang Di;Tan Weijia(The Third Geological Exploration Institute of Qinghai Nonferrous Geological Bureau,Qinghai Xining 810000,China;Geological Bureau of Nuclear Industry,Qinghai Xining 810000,China;College of Geological Engineering and Survey,Chang’an University,Xi’an 710054,China)
出处
《科技通报》
2022年第2期61-66,共6页
Bulletin of Science and Technology
基金
国家自然科学基金重大项目(No.41790443)。
关键词
岩质边坡
高地应力
蠕变
损伤理论
本构特性
拟合
rocky slope
high in-situ stress
creep
damage theory
constitutive characteristics
fitting
