饱和卤水对察尔汗地区盐岩力学性质影响研究
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摘要
为了探求饱和卤水对察尔汗地区盐岩力学特性的影响,以该地区发育的盐岩为研究对象,通过采用分层饱和法、锯式干磨法对野外采集得到的盐岩样进行加工,对加工完成的盐岩进行单轴压缩法试验。结果表明:天然状态条件下盐岩单轴抗压强度为4. 2～7. 9 MPa,属于软岩。使用当地的原位卤水饱和作用后,不含泥质夹层盐岩的软化系数为0. 59～0. 7,含泥质夹层的盐岩软化系数为0. 38～0. 67;综合分析卤水饱和状态对盐岩的力学特性影响认为,卤水主要通过溶解盐岩矿物,导致内部结构发生变化,最终使岩石强度减弱,盐岩软化;饱和卤水对含泥质夹层盐岩的软化影响大于无泥质夹层盐岩。
In order to explore the effect of saturated brine on the mechanical properties of salt rock in Qarhan area,the salt rock samples developed in the area were studied,and the salt rock samples collected in the field were processed by layered saturation method and saw-type dry grinding method.An experimental study was carried on the salt rock developed in Qarhan area by means of uniaxial compression. The result shows that the average uniaxial compressive strength of salt rock is between4. 2 and 7. 9 MPa,which belongs to soft rock. By using brine in situ to make rock salt be saturated,The softening coefficient of salt rock without argillaceous interlayer is between 0. 59 and 0. 7,and that of salt rock with argillaceous interlayer is between 0. 38 and 0. 67. A discussion was also carried on the mechanism of mechanical properties of salt rock,which points out that the uniaxial compressive strength of salt rock decreases under saturated brine,and the effect of saturated brine on the softening of argillaceous intercalated salt rock is greater than that of non-argillaceous intercalated salt rock. In a way,this research has played a leading role to the project construction in Qarhan area.
In order to explore the effect of saturated brine on the mechanical properties of salt rock in Qarhan area,the salt rock samples developed in the area were studied,and the salt rock samples collected in the field were processed by layered saturation method and saw-type dry grinding method.An experimental study was carried on the salt rock developed in Qarhan area by means of uniaxial compression. The result shows that the average uniaxial compressive strength of salt rock is between4. 2 and 7. 9 MPa,which belongs to soft rock. By using brine in situ to make rock salt be saturated,The softening coefficient of salt rock without argillaceous interlayer is between 0. 59 and 0. 7,and that of salt rock with argillaceous interlayer is between 0. 38 and 0. 67. A discussion was also carried on the mechanism of mechanical properties of salt rock,which points out that the uniaxial compressive strength of salt rock decreases under saturated brine,and the effect of saturated brine on the softening of argillaceous intercalated salt rock is greater than that of non-argillaceous intercalated salt rock. In a way,this research has played a leading role to the project construction in Qarhan area.
引文
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[12]刘振敏,杨更生.察尔汗盐湖盐壳类型及形成条件[J].化工矿产地质,1997(2):34-37.
[13]徐素国,梁卫国,莫江,等.软弱泥岩夹层对层状盐岩体力学特性影响研究[J].地下空间与工程学报,2009,5(5):878-883
[14]陈祥胜,李银平,尹洪武,等.多夹层盐矿地下储气库气体渗漏评价方法[J].岩土力学,2018,39(1):11-20.
[2]UNSCHE U. Uniaxial and Triaxial Creep and Failure Tests on Rock:Experimental Technique and Interpretation[J]. International Centre for Mechanical Sciences,1994,350:1-53.
[3]UNSCHE U,ALBRECHT H. Results of true triaxial strength tests on rock salt[J]. Engineering Fracture Mechanics,1990,35(4):867-877.
[4]陈结,姜德义,邱华富.卤水浸泡后盐岩声发射特征试验研究[J].岩土力学,2013,34(7)1937-1942.
[5]梁卫国,张传达,高红波,等.盐水浸泡作用下石膏岩力学特性试验研究[J].岩石力学与工程学报,2010,29(6):1156-1163.
[6]祝艳波,吴银亮,余宏明.隧道石膏质围岩溶蚀及溶出特性试验研究[J].现代隧道技术,2016,53(1):28-37.
[7]吴丽华,李勇,董建华.察尔汗盐湖岩盐路基应力作用下溶蚀特性试验研究[J].铁道标准设计,2014,58(9):10-13.
[8]张媛,董建华.察尔汗盐岩路基溶蚀数值模拟及病害分析[J].甘肃科学学报,2016,28(1):99-104.
[9]李银平,刘江,杨春和.泥岩夹层对盐岩变形和破损特征的影响分析[J].岩石力学与工程学报,2006(12):2461-2466.
[10]中华人民共和国国土资源部.岩石物理力学性质试验规程:DZ/T 0276. 18—2015[S].北京:地质出版社,2015:3-4.
[11]中华人民共和国水利部.工程岩体质量分级标准:GB 50218—94[S].北京:中国计划出版社,1995.
[12]刘振敏,杨更生.察尔汗盐湖盐壳类型及形成条件[J].化工矿产地质,1997(2):34-37.
[13]徐素国,梁卫国,莫江,等.软弱泥岩夹层对层状盐岩体力学特性影响研究[J].地下空间与工程学报,2009,5(5):878-883
[14]陈祥胜,李银平,尹洪武,等.多夹层盐矿地下储气库气体渗漏评价方法[J].岩土力学,2018,39(1):11-20.