摘要
废石胶结充填是实现矿山深部高效无废开采的最佳途径。为此,采用废石、水泥、黄土等集料配制7组不同配比的胶结充填体;利用RMT-150B岩石力学试验机测试其不同龄期的抗压强度;根据测试结果,建立了废石胶结充填体与围岩匹配的损伤理论模型及其能量耗散方程,将其应用于宝山矿西部2~#矿体的工业性试验采场,分析其匹配特性。研究结果表明:废石胶结充填体的损伤系数与其应变呈指数增长;废石胶结充填体的峰值应力损伤值及其应力比能随黄土含量的增加而增大,随水泥含量的增加而减少;废石胶结充填体与砂页岩的匹配系数随矿体埋深增加而增大,随围岩弹性模量增大而减小;采用D组配比的废石胶结充填体充填宝山矿工业性试验采场,在龄期为3 d时,其与砂页岩的匹配系数大于1,与砂页岩是匹配的,是该矿目前最合适的配比。
Cemented backfilling with waste rock and cement is the best way to realize efficient and no waste mining in a deep buried ore body. Therefore, the compressive strengths of cemented waste rock backfills with seven different mixture ratios at different solidification durations were measured with the rock mechanics testing machine of RMT-150B. Based on the test results, the damage theory models and the energy dissipation equations of cemented waste rock backfill and surrounding rock were established, and applied to the test stope of the No.2 ore body in the western district of Baoshan mine to analyze its matching characteristics. The results have shown that the damage coefficients of backfills increase ex- ponentially with its strain： the damage values of the peak stress and the stress potential energy of back- fills increase with the loess content, and decrease with the cement content; the matching coefficient of cemented waste rock backfill and sand shale increases with the buried depth of the ore body and de- creases with the elastic modulus; the matching coefficient of cemented waste rock backfill with mixture ratio type D and sand shale when it is more than 1 is the reasoflable matching for the mine.
出处
《采矿与安全工程学报》
EI
CSCD
北大核心
2017年第2期371-377,共7页
Journal of Mining & Safety Engineering
基金
国家自然科学基金项目(51374129)
关键词
废石胶结充填体
砂页岩体
峰值应力损伤
能量耗散
匹配系数
cemented waste rock backfill
sand shale
peak stress damage
energy dissipation
matching coefficient
作者简介
贺桂成（1977-），男，湖南省衡阳市人，副教授，博士，从事矿山岩土工程灾害预测与控制方面的研究。
通信作者：丁德馨E-mail：dingdxzzz@163．com Tel：0734．8281326
