岩土力学 ›› 2023, Vol. 44 ›› Issue (S1): 186-196.doi: 10.16285/j.rsm.2022.0926

• 基础理论与实验研究 • 上一篇    下一篇

冲击荷载下全尾砂胶结充填体断裂特性与能耗特征分析

姜明归1, 2，孙伟1, 2，李金鑫1, 2，樊锴1, 2，刘增1, 2   

  1. 1. 昆明理工大学 国土资源工程学院，云南 昆明 650093； 2. 云南理工大学 云南省中?德蓝色矿山与特殊地下空间开发利用重点实验室，云南 昆明 650093
  • 收稿日期:2022-06-14 接受日期:2022-10-12 出版日期:2023-11-16 发布日期:2023-11-16
  • 通讯作者: 孙伟，男，1983年生，博士，教授，博士生导师，主要从事膏体充填及矿山废弃资源化方面的研究工作。E-mail：kmustsw@qq.com E-mail:2794004201@qq.com
  • 作者简介:姜明归，男，1997年生，博士研究生，主要从事膏体充填绿色开采等方面的研究工作。
  • 基金资助:
    国家自然科学基金（No. 51964023）；云南省重大科技项目（No. 202202AG050014）；云南省基础研究计划（No. 202101BE070001–038，No. 202201AT070146）

Analysis of fracture characteristics and energy consumption of full tailings cemented backfill under impact load

JIANG Ming-gui1,2, SUN Wei1,2, LI Jin-xin1,2, FAN Kai1,2, LIU Zeng1,2   

  1. 1. Faculty of Land and Resources Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650093, China; 2. Yunnan Key Laboratory of Sino-German Blue Mining and Utilization of Special Underground Space, Kunming University of Science and Technology, Kunming, Yunnan 650093, China
  • Received:2022-06-14 Accepted:2022-10-12 Online:2023-11-16 Published:2023-11-16
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (51964023), the Yunnan Major Scientific and Technological Projects (202202AG050014) and the Yunnan Fundamental Research Projects (202101BE070001-038, 202201AT070146).

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摘要： 为研究冲击荷载作用下全尾砂胶结充填体断裂特性及能耗特征，借助分离式霍普金森压杆（split Hopkinson pressure bar，SHPB）试验系统，开展中等应变率下不同灰砂比充填体的单轴冲击试验。结果表明：灰砂比相同时，充填体的峰前应变能、吸收能、峰前应变能密度及吸能密度均随入射能的增加呈指数函数递增规律；当入射能小于16 J时，灰砂比为1︰6的充填体的吸能密度、峰前应变能密度、吸收能及峰前应变能比灰砂比1︰4与1︰8的更大；相同峰值强度、入射能、峰前应变能及吸收能下，充填体的断裂韧度均随灰砂比的增大而逐渐增大；充填体的断裂韧度随着动态峰值强度、吸能密度及峰前应变能密度的增加呈线性增长，而随着入射能、峰前应变能及吸收能的增加呈指数函数递增规律，灰砂比为1︰4的充填体断裂韧度随吸能密度、峰前应变能密度的增幅是灰砂比为1︰6和1︰8的2～3倍；基于应变能密度、能耗与应变的增长规律，可将充填体的损伤破坏演化过程划分为非线性压密、线弹性变形、弹塑性变形、峰后破坏4个阶段；通过对充填体试验结果回归分析，从能耗角度得出充填体断裂韧度的计算公式，可为井下充填体的稳定性分析提供参考。

关键词: 充填体, 断裂韧度, 能量耗散, 冲击荷载, 应变能密度, 吸能密度

Abstract: In order to study the fracture characteristics and energy consumption characteristics of the fully tailings cemented backfill under impact loading, uniaxial impact tests on fillers with different cement-sand ratios at moderate strain rates were carried out with the help of a split Hopkinson pressure bar (SHPB) test system. The results show that the pre-peak strain energy, absorbed energy, prepeak strain energy density and absorbed energy density of the backfill body all increase exponentially as increase of incident energy when the cement-sand ratio is the same. When the incident energy is less than 16 J, the absorbed energy density, pre-peak strain energy density, absorbed energy and pre-peak strain energy of the backfill body with the cement-sand ratio of 1:6 are greater than those of the cement-sand ratio of 1:4 and 1:8. The fracture toughness of the backfill body gradually grows with the increase of the cement-sand ratio for the same peak strength, incident energy, pre-peak strain energy and absorption energy. The fracture toughness of the backfill body increases linearly with the increase of dynamic peak strength, absorbed energy density and pre-peak strain energy density, and increases exponentially with the increase of incident energy, pre-peak strain energy and absorbed energy. The increase of fracture toughness with energy absorption density and pre-peak strain energy density of the filled body with cement -sand ratio of 1:4 is two to three times that of cement-sand ratios of 1:6 and 1:8. Based on the growth law of strain energy density, energy consumption and strain, the damage and failure evolution process of the backfill can be divided into four stages: nonlinear compression, linear elastic deformation, elasto-plastic deformation and post-peak damage. Through regression analysis of the backfill body test results, a calculation formula for the fracture toughness is derived from the perspective of energy consumption, which can provide a reference for the stability analysis of the underground backfill body.

Key words: back fill body, fracture toughness, energy dissipation, impact load, strain energy density, energy absorption density

中图分类号: TU 452
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