Dynamic mechanical behavior and mesoscopic analysis of two layered sandstone after high temperature

被引：0
作者：
Gu C. [1 ]
Xu J. [1 ,2 ]
Meng B. [1 ]
Wen M. [1 ]
Lou C. [1 ]
机构：
[1] Department of Airfield and Building Engineering, Air Force Engineering University, Xi'an
[2] College of Mechanics and Civil Architecture, Northwest Polytechnic University, Xi'an
来源：
Meitan Xuebao/Journal of the China Coal Society | 2019年 / 44卷 / 09期
关键词：
Dynamic mechanics; High temperature action; Layered sandstone; Mesoscopic analysis; Rock mechanics;
D O I：
10.13225/j.cnki.jccs.2018.1309
中图分类号：
学科分类号：
摘要：
In order to study the anisotropic characteristics of layered sandstone in dynamic and meso-structure, dynamic compression of layered sandstone after high-temperature heating was tested by large-diameter (ϕ100 mm) SHPB.Then the fracture surfaces were tested by the scanning electron micro-scope (SEM) so as to analyze the features of fracture morphology as well as the law of energy consumption and to conduct the numerical analysis of the extracted micro-crack network.According to the test results, the dynamic mechanical properties of anisotropic sandstone after high temperature are affected by the velocity of impact bullet, temperature effects and bedding anisotropy.As the velocity of impact bullet rises, the peak intensity of sandstone increases, peak strain increases, and variable model increases.As temperature rises, the peak intensity of sandstone decreases, peak strain increases, while variable model decreases.Parallel layered sandstone shows a better integration than vertical samples in terms of peak intensity, peak strain and variable model.Fractures under high strain rates show a worse integration than the ones under low strain rates, with a rougher morphology.With a temperature under 400℃, the fractures mainly consist of inter-granular fracture and trans-granular fracture, presenting brittle fracture.With a temperature of 800℃, fractures partially present plastic fracture and ductile fracture, apart from the two former modes.The energy consumption of broken sandstone is higher under high strain rates than that under low strain rates.There is obvious anisotropy among numbers, areas and shapes of fractures.In general, the fracture number in horizontal bedding samples is more than that in vertical bedding samples.The micro-fracture rate curve of horizontal bedding samples is lower than that in vertical bedding samples.Fracture shapes in vertical bedding samples are generally more regular than those in horizontal bedding samples.Fracture shapes of dynamic broken samples after high temperature tend to be regular. © 2019, Editorial Office of Journal of China Coal Society. All right reserved.
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页码：2710 / 2720
页数：10
相关论文
共 21 条
  • [1] Sun Q., Zhang Z., Xue L., Et al., Physical-mechanical properties variation of rock with phase transformation under high temperature, Chinese Journal of Rock Mechanics and Engineering, 32, 5, pp. 935-942, (2013)
  • [2] Su C., Wei S., Qin B., Et al., Experimental study of influence mechanism of high temperature on mechanical properties of fine-grained sandstone, Rock and Soil Mechanics, 38, 3, pp. 623-630, (2017)
  • [3] Su C., Wei S., Qin B., Et al., Research on physical parameters of three kinds of sandstone after high temperature, Chinese Journal of Underground Space and Engineering, 14, 2, pp. 341-348, (2018)
  • [4] Rutqvist J., Barb D., Datta R., Coupled thermal hydrological mechanical analyses of the Yucca mountain drift scale test comparison of field measurements to predictions of four different numerical models, International Journal of Rock Mechanics and Mining Sciences, 42, 5-6, pp. 680-697, (2005)
  • [5] Hajpal M., Changes in sandstone of historical monuments exposed to fire or high temperature, Fire Technology, 38, 4, pp. 373-382, (2002)
  • [6] Tien Y.M., Kuo M.C., A Failure criterion for transversely isotropic rocks, International Journals of Rock Mechanic & Mining Science, 38, 3, pp. 399-412, (2001)
  • [7] Su H., Jing H., Zhao H., Et al., Study on tensile strength and size effect of red sandstone after high temperature treatment, Chinese Journal of Rock Mechanics and Engineering, 34, pp. 2879-2887, (2015)
  • [8] Wu G., Xing A., Zhang L., Mechanical charactistics of sandstone after high temperatures, Chinese Journal of Rock Mechanics and Engineering, 26, 10, pp. 2110-2116, (2007)
  • [9] Xu P., Chen Y., Wang S., Et al., Analysis of mechanical property single fracture rock under action of high temperature, Journal of Water Resources & Water Engineering, 27, 2, pp. 216-222, (2016)
  • [10] Li Q., Yang S., Chen G., Strength and deformation properties of post-high-temperature joint sandstone, Journal of China Coal Society, 39, 4, pp. 651-657, (2014)
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