基于OFDR技术的胶结充填体内部应变演化试验  

Internal Strain Evolution Test of Cemented Backfill Based on OFDR Technology

作　　者：李磊 侯晨 朱万成[1] 杨柳君 LI Lei;HOU Chen;ZHU Wan-cheng;YANG Liu-jun(Shchool of Resources&Civil Engineering,Northeastern University,Shenyang 110819,China.)

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819

出　　处：《东北大学学报（自然科学版）》2023年第2期258-264,共7页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(51904055,U1906208,51874069);中央高校基本科研业务费专项资金资助项目(N2001010).

摘　　要：采用光频域反射光纤传感(optical frequency domain reflectometer,OFDR)技术,进行了充填体内部应变高精度测量室内试验,获得了不同胶结剂含量下的充填体在早期硬化过程中的内部应变演化规律和分布特征.结果表明:充填体内部应变演化受固体颗粒物理沉降和化学水化反应的共同作用,可分为物理沉降拉伸、水化放热膨胀、化学自收缩和基本保持稳定4个阶段;充填体内部应变分布前期主要呈上凸型曲线特征,随养护时间的增加,呈现多峰形曲线特征;OFDR技术能够实现充填体内部应变的高精度分布式测量,以及精细分析充填体的内部应变演化特征.By using optical frequency domain reflectometer(OFDR),a high-precision laboratory test of backfill was carried out,and the internal strain evolution law and distribution characteristics of the backfill during the early hardening process with different cement content was obtained.The results show that the internal strain evolution of the backfill is affected by the combined action of the physical sedimentation of solid particles and the chemical hydration reaction,which can be divided into four stages:physical sedimentation and stretching,hydration exothermic expansion,chemical autogenous shrinkage and basically stablestage.The internal strain distribution of the backfill mainly presents an upward convex curve in the early stage,and with the increase of curing time,it presents a multi-peak curve characteristic;OFDR technology can be used to realize high-precision distributed measurement of the internal strain of backfill and analyze the evolution characteristics of internal strain of backfill.

关 键 词：OFDR分布式监测 应变演化 胶结充填体 时空分布 化学收缩 

分 类 号：TD853[矿业工程—金属矿开采]