三种倾角结构面对岩体变形破坏特征影响研究
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摘要
以山西朔州麻家梁煤矿砂岩以及张集煤矿闪长岩为例,将岩样加工成60°,75°,90°三种倾角结构面的岩样,并对加工后的结构面进行水泥填充,进而研究3种倾角结构面对岩体力学特性与破坏形态的影响。单轴压缩试验与数值模拟试验结果表明:随着倾角的增大,两种岩性岩样单轴抗压强度都呈现上升的趋势,同条件下的闪长岩岩样单轴抗压强度要小于砂岩岩样单轴抗压强度;结构面倾角为60°与75°的岩样主要从顶部与侧面结构面附近萌生裂隙开始发生破坏,随着加载应力不断增大,岩体顶部应力集中部分将出现破碎并使岩体完全破坏,而结构面倾角为90°的岩样主要是由于岩体顶部萌生出大量竖向扩张劈裂隙使岩体发生破坏。
Taking the sandstone from Majialiang coalmine and the diorite from Zhangji coalmine as examples,the rock masses are processed into samples with structural planes of 60°,75° and 90°,which were filled with cement to study the influence of the rock mass with 3 structural planes on mechanics characteristic and destruction properties. The results of the uniaxial compression test and numerical simulation experiment show that with the increase of structural plane dip,the uniaxial compressive strength of the two kinds of samples increases,and the uniaxial compressive strength of the diorite sample is less than that of the sandstone sample under the same condition. The cracks that initiated near the top and the side of structure plane of 60° and 75° started to propagate,with the continuous increase of the load stress,fragmentation occurs at the top of the rock mass where the stress is concentrated,which caused the complete destruction of the rock mass; the rock samples with structural plane of 90° were destructed due to the large quantities of vertical and expansive hack cracks on the rock top.
Taking the sandstone from Majialiang coalmine and the diorite from Zhangji coalmine as examples,the rock masses are processed into samples with structural planes of 60°,75° and 90°,which were filled with cement to study the influence of the rock mass with 3 structural planes on mechanics characteristic and destruction properties. The results of the uniaxial compression test and numerical simulation experiment show that with the increase of structural plane dip,the uniaxial compressive strength of the two kinds of samples increases,and the uniaxial compressive strength of the diorite sample is less than that of the sandstone sample under the same condition. The cracks that initiated near the top and the side of structure plane of 60° and 75° started to propagate,with the continuous increase of the load stress,fragmentation occurs at the top of the rock mass where the stress is concentrated,which caused the complete destruction of the rock mass; the rock samples with structural plane of 90° were destructed due to the large quantities of vertical and expansive hack cracks on the rock top.
引文
[1]何忠明,彭振斌,曹平,等.层状岩体单轴压缩室内试验分析与数值模拟[J].中南大学学报:自然科学版,2010,41(5):1906-1912.
[2]冒海军,杨春和.结构面对板岩力学特性影响研究[J].岩石力学与工程学报,2005,(20):53-58.
[3]石北啸,王笃波,李永芳.裂隙岩样在动静组合荷载下的力学特性研究[J].人民黄河,2010,(8):117-118.
[4]肖桃李,艾明,路亚妮.岩体结构面强度特性及地下水影响[J].河北大学学报:自然科学版,2013,33(6):572-577.
[5]何沛田,黄志鹏.层状岩石的强度和变形特性研究[J].岩土力学,2003,(S1):1-5.
[6]Mcconaughy D T,Engelder T.Joint initiation in bedded clastic rocks[J].International Journal of Structural Geology,2001,23(2):203-221.
[7]Cooke M M L,Simo J A,Underwood C A,et al.Mechanical stratigraphic controls on fracture patterns within carbonates and implications for groundwater flow[J].International Journal of Sedimentary Geology,2006,184(3):225-239.
[8]LI Y P,YANG C H.On fracture saturation in layered rocks[J].International Journal of Rock Mechanics and Mining Sciences,2007,44(6):936-941.
[9]刘伟,李银平,尹栋梁,等.含倾斜夹层盐岩体变形与破损特征分析[J].岩土力学,2013,(3):645-652.
[10]孟召平,陆鹏,贺小黑.沉积结构面及其对岩体力学性质的影响[J].煤田地质与勘探,2009,37(1):33-37.
[11]韩建新,李术才,李树枕,等.多组贯穿裂隙岩体变形特性研究[J].岩石力学与工程学报,2011,(S1):3319-3325.
[12]贾蓬,唐春安,杨天鸿,等.具有不同倾角层状结构面岩体中隧道稳定性数值分析[J].东北大学学报:自然科学版,2006,27(11):1275-1278.
[13]李术才,韩建新,仝兴华,等.随机分布贯穿裂隙岩体变形特性研究[J].岩土力学,2012,(9):2677-2682.
[14]唐杠梅,张金浩,陈洪凯.不同应力状态下砂岩变形与破坏试验研究[J].人民长江,2014,45(12):81-85.
[2]冒海军,杨春和.结构面对板岩力学特性影响研究[J].岩石力学与工程学报,2005,(20):53-58.
[3]石北啸,王笃波,李永芳.裂隙岩样在动静组合荷载下的力学特性研究[J].人民黄河,2010,(8):117-118.
[4]肖桃李,艾明,路亚妮.岩体结构面强度特性及地下水影响[J].河北大学学报:自然科学版,2013,33(6):572-577.
[5]何沛田,黄志鹏.层状岩石的强度和变形特性研究[J].岩土力学,2003,(S1):1-5.
[6]Mcconaughy D T,Engelder T.Joint initiation in bedded clastic rocks[J].International Journal of Structural Geology,2001,23(2):203-221.
[7]Cooke M M L,Simo J A,Underwood C A,et al.Mechanical stratigraphic controls on fracture patterns within carbonates and implications for groundwater flow[J].International Journal of Sedimentary Geology,2006,184(3):225-239.
[8]LI Y P,YANG C H.On fracture saturation in layered rocks[J].International Journal of Rock Mechanics and Mining Sciences,2007,44(6):936-941.
[9]刘伟,李银平,尹栋梁,等.含倾斜夹层盐岩体变形与破损特征分析[J].岩土力学,2013,(3):645-652.
[10]孟召平,陆鹏,贺小黑.沉积结构面及其对岩体力学性质的影响[J].煤田地质与勘探,2009,37(1):33-37.
[11]韩建新,李术才,李树枕,等.多组贯穿裂隙岩体变形特性研究[J].岩石力学与工程学报,2011,(S1):3319-3325.
[12]贾蓬,唐春安,杨天鸿,等.具有不同倾角层状结构面岩体中隧道稳定性数值分析[J].东北大学学报:自然科学版,2006,27(11):1275-1278.
[13]李术才,韩建新,仝兴华,等.随机分布贯穿裂隙岩体变形特性研究[J].岩土力学,2012,(9):2677-2682.
[14]唐杠梅,张金浩,陈洪凯.不同应力状态下砂岩变形与破坏试验研究[J].人民长江,2014,45(12):81-85.