不同块石配比充填体的强度特性研究卓毓龙1陈辰1曹世荣1.DOC

不同块石配比充填体特性研究 ，陈辰，，王晓军，邓书强，冯萧 （1.江西理工大学，赣州） ：RMT-150C型液压伺服控制系统进行不同块石含量胶结充填体的室内抗压试验 MPa，30%时抗压强度值为4.090 MPa，40%时抗压强度值为2.729 MPa，50%时抗压强度值为3.333 MPa，抗压强度值随块石含量增加呈现先增后减再增的变化规律；分析四组应力-应变曲线峰值应力对应的应变可得，块石含量为0时峰值应力对应的应变在0.006附近，30%时峰值应力对应的应变在0.0075附近，40%时峰值应力对应的应变在0.010附近，50%时峰值应力对应的应变在0.0125附近。说明块石的增加有效提高了充填体的变形能力，但在一定程度上削减了充填体的支承能力。 关键词：块石胶结充填体；力学特性；块石含量单轴抗压强度；Study on the strength characteristics of different block stone filling material ZHUO Yu-long CHEN Chen CAO Shi-rong WANG Xiao-jun DENG Shu-qiang FENG Xiao (Resources and Environmental Engineering，Jiangxi University of Science and Technology，Ganzhou 341000；Post-doctoral Scientific Research Workstation, Western Mining Co., Xining 810006, China) Abstract：Using RMT-150C hydraulic servo control system to carry out the single axial compression test of the cement filling body with different block stone.The compressive strength of the block was 3.800 MPa、4.090 MPa、2.729 MPa、3.333 MPa respectively, when the mass fraction of the block is 0%、30%、40%、50%. The change law of the compressive strength value first increase and then reduce and increased again with the increase of the content of the block stone. The value of strain which stress corresponded of peak value the stress-strain curve of the four groups was analyzed. The strain value of the block was 0.006、0.0075、0.010、0.0125 when the mass fraction of the block is 0%、30%、40%、50%. The increase of the rock block can effectively improve the deformation capacity of the filling body, but it can reduce the bearing capacity of the filling body to a certain extent. Key words：Blocky rock cemented filling；Mechanical properties；Stone content；Uniaxial compressive strength; Particle size 块石胶结充填作为矿山当今乃至今后应对地表塌陷，降低废物排放，控制深部地压的主要方法具有广阔的发展空间与极大地应用前景[1-3]。目前国内外学者和研究人员已经逐步开始对矿山固废胶结充填体进行专项研究：邓代强、谢和平、吴政等研究提出4-7]；LEMAITRE在充填体单轴压缩、劈裂拉伸全应力-应变曲线试验的基础上分析充填体的微观破坏特征并建立了压缩、拉伸状态下胶结充填体的损伤演化本构方程[8-9]；刘志祥等研究了充填体不同配比情况下10]；李一帆等进行了尾砂胶结充填体材料配比试验并分析了该配比下的充填体强度特性[11]；韩斌等提出了基于可靠度理论的下向进路充填体强度确定方法和随机参数敏感性分析方法[