加卸载条件下喷射混凝土力学特性试验研究
Experimental Study on Mechanical Properties of Shotcrete Under Loading and Unloading Condition
-
摘要: 为了研究喷射混凝土在加固支护后的力学特性,开展了循环加卸载下不同配比的混凝土试样力学试验,分析了不同骨料粒径和水灰比下混凝土试样的强度特征、变形特征以及应变随时间的变化规律。研究结果表明:在加卸围压试验中,可利用混凝土试样损坏时的围压与卸载时围压的比值来评判混凝土的强度,比值越小,代表混凝土试样的强度越高;在加卸围压试验中试样的应变比常规三轴试验小,低水灰比和小粒径的试样的脆性破坏更显著,破裂面更加完整;试样的破坏强度大体上呈现随着粒径的减小,破坏强度增大的趋势;水灰比较高的试样,在卸载试验中存在延时破坏的特征。Abstract: In order to study the mechanical properties of shotcrete after reinforcement, the mechanical tests of concrete with different ratios under cyclic loading and unloading were carried out, and the strength characteristics, deformation characteristics and strain changes with time of concrete with different aggregate particle sizes and water-cement ratios were analyzed. The results show that the concrete strength can be evaluated by the ratio of confining pressure when concrete samples are damaged to that when concrete samples are unloaded. The smaller the ratio is, the higher the strength of concrete samples is. In the confining pressure test, the strain of the sample is smaller than that of the conventional triaxial test, the brittle failure of the sample with low water-cement ratio and small particle size is more significant, and the fracture surface is more complete. The failure strength of the sample increases with the decrease of particle size. The sample with high water ash has the characteristics of delayed failure in unloading test.
-
Keywords:
- shotcrete /
- unloading effect /
- shear failure /
- particle size /
- water-cement ratio /
- roadway support
-
-
[1] 谢和平,高峰,鞠杨,等.深地科学领域的若干颠覆性技术构想和研究方向[J].工程科学与技术,2017,49(1):1-8. [2] 何富连,张广超.深部高水平构造应力巷道围岩稳定性分析及控制[J].中国矿业大学学报,2015,44(3):466-476. [3] GAO Fuqiang, STEAD Doug, KANG Hongpu. Numerical simulation of squeezing failure in a coal mine roadway due to mining-induced stresses[J]. Rock Mechanics and Rock Engineering, 2015, 48(4):1635. [4] 李新平,汪斌,周桂龙.我国大陆实测深部地应力分布规律研究[J].岩石力学与工程学报,2012,31(s1):2875-2880. [5] Liu H, Sang S, Xue J, et al. Characteristics of an in situ stress field and its control on coal fractures and coal permeability in the Gucheng block, southern Qinshui Basin, China[J]. Journal of Natural Gas science & Engineering, 2016, 36: 1130-1139. [6] 刘泉声,刘恺德.淮南矿区深部地应力场特征研究[J].岩土力学,2012,33(7):2089-2096. [7] 郭晓菲,马念杰,赵希栋,等.圆形巷道围岩塑性区的一般形态及其判定准则[J].煤炭学报,2016,41(8):1871-1877. [8] 谢生荣,谢国强,何尚森,等.深部软岩巷道锚喷注强化承压拱支护机理及其应用[J].煤炭学报,2014,39(3):404-409. [9] 阚甲广,张农,李桂臣,等.泥化巷道底板控制技术研究[J].采矿与安全工程学报,2011,28(3):356-360. [10] 李树忱,朱林,孙爱花,等.超欠挖状态下支护结构的力学特性研究[J].煤炭学报,2017,42(11):2817. [11] 徐全,吴家耀,褚卫江,等,刘加进.喷射混凝土力学时空特性在中东抽蓄中的应用[J].地下空间与工程学报,2020,16(3):852-862. [12] 方芳,谢冬冬.巷道围岩喷射混凝土动态力学性能及损伤机理[J].煤矿安全,2019,50(1):58-61. [13] 丁莎,牛荻涛,王家滨.喷射粉煤灰混凝土微观结构和力学性能试验研究[J].硅酸盐通报,2015,34(5):1187-1192. [14] 刘智,赵兰浩,吴晓彬,等.循环荷载下考虑滞回效应的混凝土损伤模型[J].工程科学与技术,2020,52(4):1-7. [15] 焦华喆,韩振宇,陈新明,等.玄武岩纤维对喷射混凝土力学性能及微观结构的影响机制[J].复合材料学报,2019,36(8):1926-1934. [16] 张硕,徐进鹏,段兴平,等.纳米钢纤维喷射混凝土设计及性能试验研究[J].人民长江,2018,49(S1):257-259. [17] 曾振海,李传习,柯璐,等.玄武岩/聚丙烯腈混杂纤维混凝土力学性能及最优纤维掺量研究[J/OL].铁道科学与工程学报:1-9[2020-07-13].https://doi.org/10.19713/j.cnki.43-1423/u.T20200451. [18] 胡晓鹏,彭刚,牛荻涛,等.施工期混凝土反复受压应力-应变关系研究[J/OL].建筑材料学报:1-13[2020-07-13].http://kns.cnki.net/kcms/detail/31.1764. TU.20191207.1539.008.html. [19] 张军,余振鹏,谢兴华,等.普通混凝土剪切力学性能试验研究[J].混凝土,2019(11):50-53. [20] 张华,郭继鑫,傅玉珍,等.冲击作用下混凝土裂纹扩展试验研究及数值模拟[J].振动与冲击,2016,35(17):107-112. -
期刊类型引用(3)
1. 桑树勋，皇凡生，单衍胜，周效志，刘世奇，韩思杰，郑司建，刘统，王梓良，王峰斌. 碎软低渗煤储层强化与煤层气地面开发技术进展. 煤炭科学技术. 2024(01): 196-210 . 
百度学术
2. 张佳伟. 煤层综放初采高回收技术与顶煤促放效果验证. 山东煤炭科技. 2024(08): 1-5+10 . 百度学术
3. 方刚. 巴拉素井田富水煤层顶底板矿物岩石特征研究. 中国矿业. 2023(10): 181-188 . 百度学术
其他类型引用(3)
计量
- 文章访问数: 25
- HTML全文浏览量: 0
- PDF下载量: 0
- 被引次数: 6
下载:
