泥质含量对砂岩力学性质及其破坏特征的影响规律研究
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摘要
岩石强度是影响煤层顶板稳定性及支护方式选择的重要因素之一。为研究泥质含量对顶板砂岩力学特性及其破坏特征的影响规律,通过岛津AG-X250电子万能试验机进行了3种含泥质不等量砂岩单轴压缩试验和巴西劈裂试验。试验结果表明:泥质的存在会弱化砂岩的强度,其中含少量、大量泥质的砂岩,其单轴抗压强度较不含泥质砂岩分别折减了22%和4%,抗拉强度分别折减了47%和45%,抗压及抗拉强度折减范围并不同步;计算统计了3种砂岩初始弹性模量E_i与切线弹性模量E_t的比值θ,发现含少量泥质的砂岩θ值最大,表明其内部裂隙发育较好;对3种砂岩的破坏模式进行分析,发现不含泥质砂岩为剪切破坏,含泥质砂岩为纵向劈裂破坏且含少量泥质砂岩破裂面倾角更小。
Rock strength is one of the important factors which affect roof stability and selection of support methods. To study the influence of different argillaceous contents on mechanical properties and failure characteristics of roof sandstone, three kinds of sandstone with different amounts of muddy were tested under uniaxial compression and Brazil splitting test through SHIMADZU AG-X250 electronic universal testing machine. The test results show that: the existence of mud weakens the strength of sandstone.In three kinds of sandstone, containing with a small amount and a big amount of argillaceous sandstone, whose uniaxial compressive strength is reduced by 22 % and 4 % respectively compared with those without argillaceous sandstone, in addition,the tensile strength reduced by 47 % and 45 %, respectively. The reduction range of compressive strength and tensile strength is not synchronous; the ratio of initial elastic modulus E_i and tangent modulus E_t of three kinds of sandstone is calculated and counted. Containing with a small amount of argillaceous sandstone has biggest θ value, indicating that its internal fracture develops well; through analyzing the failure modes of three types of sandstone, it is found that the shearing failure is non-argillaceous sandstone, the longitudinal splitting failure is argillaceous sandstone, and the inclination angle of the fracture surface with a small amount of argillaceous sandstone is smaller.
Rock strength is one of the important factors which affect roof stability and selection of support methods. To study the influence of different argillaceous contents on mechanical properties and failure characteristics of roof sandstone, three kinds of sandstone with different amounts of muddy were tested under uniaxial compression and Brazil splitting test through SHIMADZU AG-X250 electronic universal testing machine. The test results show that: the existence of mud weakens the strength of sandstone.In three kinds of sandstone, containing with a small amount and a big amount of argillaceous sandstone, whose uniaxial compressive strength is reduced by 22 % and 4 % respectively compared with those without argillaceous sandstone, in addition,the tensile strength reduced by 47 % and 45 %, respectively. The reduction range of compressive strength and tensile strength is not synchronous; the ratio of initial elastic modulus E_i and tangent modulus E_t of three kinds of sandstone is calculated and counted. Containing with a small amount of argillaceous sandstone has biggest θ value, indicating that its internal fracture develops well; through analyzing the failure modes of three types of sandstone, it is found that the shearing failure is non-argillaceous sandstone, the longitudinal splitting failure is argillaceous sandstone, and the inclination angle of the fracture surface with a small amount of argillaceous sandstone is smaller.
引文
[1]朱永建,冯涛.锚杆支护超长煤巷顶板稳定性动态分类研究[J].煤炭学报,2012,37(4):565-570.
[2]王辉,杨双锁.多软弱夹层的巷道顶板稳定特性及支护设计[J].煤矿安全,2017,48(4):199-202.
[3]赵延林,吴启红,王卫军,等.基于突变理论的采空区重叠顶板稳定性强度折减法及应用[J].岩石力学与工程学报,2010,29(7):1424-1434.
[4]刘畅,弓培林,王开,等.复采工作面过空巷顶板稳定性[J].煤炭学报,2015,40(2):314-322.
[5]郭东明,左建平,张毅,等.不同倾角组合煤岩体的强度与破坏机制研究[J].岩土力学,2011,32(5):1333.
[6]陈绍杰,尹大伟,张保良.顶板-煤柱结构体力学特性及其渐进破坏机制研究[J].岩石力学与工程学报,2017,36(7):1588-1598.
[7]付斌,周宗红,王友新,等.煤岩组合体破坏过程RFPA(2D)数值模拟[J].大连理工大学学报,2016,56(2):132-139.
[8]潘建武.含单一天然弱面岩石试样的力学特性研究[D].焦作:河南理工大学,2010.
[9]刘运思,傅鹤林,武毅敏.基于单弱面理论对板岩巴西劈裂试验研究[J].煤炭学报,2013,38(10):1775.
[10]尹乾,靖洪文,苏海健.含纵向裂隙砂岩的强度劣化与加载速率效应[J].采矿与安全工程学报,2016,33(1):128-133.
[11]徐婧,杨双锁,罗海燕.单颗粒杂质位置与圆盘试件(下转第页)单轴劈裂抗拉强度相关性研究[J].科学技术与工程,2016(19):102-109.
[12]尹大伟,陈绍杰,邢文彬,等.不同加载速率下顶板-煤柱结构体力学行为试验研究[J].煤炭学报,2018,43(5):1249-1257.
[13]马宏发,尹大伟,陈绍杰,等.浸水作用对煤岩抗拉强度及其破坏特征影响研究[J].矿业研究与开发,2018,38(4):56-60.
[14]GB/T 50266-2013工程岩体试验方法标准[S].
[15]赵文,曹平,章光.岩石力学[M].长沙:中南大学出版社,2010:18.
[16]王明洋,范鹏贤,李文培.岩石的劈裂和卸载破坏机制[J].岩石力学与工程学报,2010,29(2):234-241.
[2]王辉,杨双锁.多软弱夹层的巷道顶板稳定特性及支护设计[J].煤矿安全,2017,48(4):199-202.
[3]赵延林,吴启红,王卫军,等.基于突变理论的采空区重叠顶板稳定性强度折减法及应用[J].岩石力学与工程学报,2010,29(7):1424-1434.
[4]刘畅,弓培林,王开,等.复采工作面过空巷顶板稳定性[J].煤炭学报,2015,40(2):314-322.
[5]郭东明,左建平,张毅,等.不同倾角组合煤岩体的强度与破坏机制研究[J].岩土力学,2011,32(5):1333.
[6]陈绍杰,尹大伟,张保良.顶板-煤柱结构体力学特性及其渐进破坏机制研究[J].岩石力学与工程学报,2017,36(7):1588-1598.
[7]付斌,周宗红,王友新,等.煤岩组合体破坏过程RFPA(2D)数值模拟[J].大连理工大学学报,2016,56(2):132-139.
[8]潘建武.含单一天然弱面岩石试样的力学特性研究[D].焦作:河南理工大学,2010.
[9]刘运思,傅鹤林,武毅敏.基于单弱面理论对板岩巴西劈裂试验研究[J].煤炭学报,2013,38(10):1775.
[10]尹乾,靖洪文,苏海健.含纵向裂隙砂岩的强度劣化与加载速率效应[J].采矿与安全工程学报,2016,33(1):128-133.
[11]徐婧,杨双锁,罗海燕.单颗粒杂质位置与圆盘试件(下转第页)单轴劈裂抗拉强度相关性研究[J].科学技术与工程,2016(19):102-109.
[12]尹大伟,陈绍杰,邢文彬,等.不同加载速率下顶板-煤柱结构体力学行为试验研究[J].煤炭学报,2018,43(5):1249-1257.
[13]马宏发,尹大伟,陈绍杰,等.浸水作用对煤岩抗拉强度及其破坏特征影响研究[J].矿业研究与开发,2018,38(4):56-60.
[14]GB/T 50266-2013工程岩体试验方法标准[S].
[15]赵文,曹平,章光.岩石力学[M].长沙:中南大学出版社,2010:18.
[16]王明洋,范鹏贤,李文培.岩石的劈裂和卸载破坏机制[J].岩石力学与工程学报,2010,29(2):234-241.