摘要
从实验角度研究了不同侧限压力、温度及酸根离子浓度条件下的膏体-围岩接触面的剪切强度演变规律,并采用一系列微观实验揭示了不同因素对接触面强度的影响机理,研究发现温度对接触面强度的提升主要是通过促进胶凝材料水化反应实现,而高养护压力能够增大排水条件下膏体充填体的有效应力和基质吸力,酸根离子对接触面的影响体现在减缓水化反应和增加膏体围岩接触面积两个方面。研究结果对于建立膏体-围岩接触面本构模型以及后期的充填配比优化都具有重要意义。
This study experimentally investigated the shear strength at the cemented paste backfill(CPB)-surrounding rock interface under varying confining pressures,temperatures,and concentrations of acid radical ions.Meanwhile,a series of micro-experiments were conducted to reveal the mechanisms through which these factors influence the interface strength.It was found that the enhancement of interface strength by temperature is primarily achieved through the promotion of cementitious material hydration reactions,while a high curing pressure serves to promote the effective stress and matric suction of CPB under drainage conditions.The influence of acid radical ions on the interface is manifested in two aspects:decelerating the hydration reaction and expanding the contact area between CPB and the surrounding rock.These findings are of meaningful to establishing a constitutive model for CPB-surrounding rock interface and optimizing the filling ratio in the future.
作者
方坤
于奇龙
张云
王云搏
黄鹏
FANG Kun;YU Qiong;ZHANG Yun;WANG Yunbo;HUANG Peng(School of Mines,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;School of Energy,Xi'an University of Science and Technology,Xi'an,Shaanxi 710054,China)
出处
《采矿与安全工程学报》
北大核心
2025年第3期521-531,共11页
Journal of Mining & Safety Engineering
基金
国家自然科学基金项目(52304159)
中央高校基本科研业务费专项资金项目(2023QN1003)。
关键词
膏体充填
接触面
剪切特性
cemented paste backfill
interface
shear properties
