高温对砂岩强度特性的影响试验研究
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摘要
为了研究高温对砂岩强度的影响,利用中国科学院武汉岩土力学研究所XTR01岩石力学试验机对200～1 000℃高温处理后的砂岩开展三轴压缩试验,研究砂岩物理力学特性与温度和围压的关系。试验结果表明:砂岩的三轴抗压强度和弹性模量都随温度的升高呈现先增大后减少的变化规律,在600℃时达到最大值;三轴抗压强度和弹性模量随围压的增大而线性增加。由此得出600℃是砂岩的1个阀值温度。
To study the effect of high temperature on strength of sandstone, the relationship between the physical and mechanical properties of sandstone and its temperature and confining pressure was studied by using XTR01 rock mechanics testing machine to carry out triaxial compression test of sandstone after high temperature treatment from 200 ℃ to 1 000 ℃. The results show that compressive strength and elastic modulus of sandstone increase as the temperature increases before 600 ℃, then decrease with the increasing temperature, and reach the maximum value at 600 ℃ and with the increasing of confining pressure, compressive strength and elastic modulus increases linearly. It is concluded that 600 ℃ is a threshold temperature.
To study the effect of high temperature on strength of sandstone, the relationship between the physical and mechanical properties of sandstone and its temperature and confining pressure was studied by using XTR01 rock mechanics testing machine to carry out triaxial compression test of sandstone after high temperature treatment from 200 ℃ to 1 000 ℃. The results show that compressive strength and elastic modulus of sandstone increase as the temperature increases before 600 ℃, then decrease with the increasing temperature, and reach the maximum value at 600 ℃ and with the increasing of confining pressure, compressive strength and elastic modulus increases linearly. It is concluded that 600 ℃ is a threshold temperature.
引文
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[13]何国梁,吴刚,黄醒春,等.砂岩高温前后超声特性的试验研究[J].岩土力学,2007,28(4):779-784.
[14]夏小和,陆雅萍,黄醒春,等.高温后大理岩在不同应力水平下超声波特性的实验研究[J].上海交通大学学报,2004,38(7):1225-1228.
[15]支乐鹏,许金余,刘军忠,等.花岗岩高温后的超声特性及力学性能研究[J].地下空间与工程学报,2012,8(4):716-721.
[16]尤明庆,苏承东,周英.不同煤块的强度变形特性及强度准则的回归方法[J].岩石力学与工程学报,2003,22(12):2081-2085.
[2]徐小丽,高峰,张志镇,等.高温后花岗岩能量及结构效应研究[J].岩土工程学报,2014(5):961-968.
[3]DAVID C,MENENDEZ B,DAROT M.Influence of stress-induced and thermal cracking on physical properties and microstructure of La Peyratte granite[J].International Journal of Rock Mechanics and Mining Sciences,1999,36(4):433-448.
[4]HAJPAL M.Changes in sandstone of historical monuments exposed to fire or high temperature[J].Fire Technology,2002,38(4):373-382.
[5]吴忠,秦本东,谌伦建,等.煤层顶板砂岩高温状态下力学特征试验研究[J].岩石力学与工程学报,2005,24(11):1863-1867.
[6]朱合华,闫治国,邓涛,等.3种岩石高温后的力学性质的试验研究[J].岩石力学与工程学报,2006,25(10):1945-1950.
[7]李建林,陈星,党莉,等.高温后砂岩三轴卸荷试验研究[J].岩石力学与工程学报,2011,30(8):1587.
[8]吴刚,邢爱国,张磊.砂岩高温后的力学特性[J].岩石力学与工程学报,2007,26(10):2110-2116.
[9]苏承东,郭文兵,李小双.粗砂岩高温作用后力学效应的试验研究[J].岩石力学与工程学报,2008,27(6):1162-1170.
[10]尹光志,李小双,赵洪宝.高温后粗砂岩常规三轴压缩条件下力学特性试验研究[J].岩石力学与工程学报,2009,28(3):598-604.
[11]赵洪宝,尹光志,李小双.烧变后粗砂岩抗拉强度特性试验研究[J].岩土力学,2010,31(4):1143-1146.
[12]左建平,周宏伟,谢和平.不同温度影响下砂岩的断裂特性研究[J].工程力学,2008,25(5):124-130.
[13]何国梁,吴刚,黄醒春,等.砂岩高温前后超声特性的试验研究[J].岩土力学,2007,28(4):779-784.
[14]夏小和,陆雅萍,黄醒春,等.高温后大理岩在不同应力水平下超声波特性的实验研究[J].上海交通大学学报,2004,38(7):1225-1228.
[15]支乐鹏,许金余,刘军忠,等.花岗岩高温后的超声特性及力学性能研究[J].地下空间与工程学报,2012,8(4):716-721.
[16]尤明庆,苏承东,周英.不同煤块的强度变形特性及强度准则的回归方法[J].岩石力学与工程学报,2003,22(12):2081-2085.