rather thanGlobal Geology ，22（1）ʒ56-61（2019）
doi ：10.3969/j.issn.1673-9736.2019.01.07Article ID ：1673-9736（2019）01-0056-06
多少钱用英语怎么说>januaryExperimental study on mechanical properties of
去美国留学要多少钱
granite under different cooling methods
冰与火之歌权力的游戏after thermal treatment
毕业证书翻译
ZHOU Junhong ，WANG Xin *，HU Zhongjun ，XU Rongboyu ，YANG Dong and TU Zhenyu
College of Construction Engineering ，Jilin University ，Changchun 130026，Chinavalidity
开除英文
Received 28June 2018，accepted 27August 2018
Supported by "The Training Plan of College Students'Creation"（2017A53449）in Jilin University ，New Energy Item of Jilin Province Combining with
Universities （SF2017-5-5）．
*Corresponding author （E-mail ：1142185906@qq．com ）．
Abstract ：Static uniaxial compression tests were conducted on 16granite specimens after thermal treatment using a heating device and an electro-hydraulic rvo pressure-testing machine．The effects of air cooling and water cooling on the physical and mechanical properties of the high-temperature granite specimens were studied．Test results showed that the longitudinal wave velocities of the high-temperature specimens gradually decread after they were cooled by water and air．The peak stress and elastic modulus of the samples decread gradually with an increa in temperature ，whereas their peak strain incread gradually．The effects of peak stress and peak strain were considerably more evident when cooling by water than by air．This result demonstrated that the thermal cracking of the granite specimens ，and conquently ，their internal micro-fractures ，further developed when the specimens were cooled by water．
Keywords ：granite ；high temperature effect ；cooling method ；mechanical properties
0Introduction
The process of exploring and utilizing enhanced
geothermal systems involve the drilling of inner ther-mal rock （granite ）．The surrounding rocks of the wellbore are influenced by the low temperature well-drilling liquid ，paste ，and water ，whic
h lead to the rapid decrea in the temperature around the well．The physical characteristics of the surrounding rocks of the borehole can be changed by the coupling effects of the temperature ，epage ，and stress fields ，which can easily lead to complex issues ，such as the thermal rupture of the surrounding rocks ，necking ，hole sloug-hing ，the sticking of tools ，and the crashing of the
casing pipe （Xi ，2009；Li et al ．，2011，Yang ＆Hu ，2001）．In recent years ，scholars worldwide have con-ducted considerable studies on the physical and me-chanical characteristics of granite under or after the effect of high temperature （Yin et al ．，2016，Xu et al ．，2014；Qin ，2017；Du et al ．，2003）．Rocks are typically cooled by air ，and Chine scholars ，such as Xiong et al．（2018），have developed systematic sum-
fashion是什么意思全国大学生四六级考试官网maries and analys on this aspect （Xiong ＆Yu ，2018）．Xi et al．（2010）experimentally studied the behavior of thermal granite cooled by water ，but they did not analyze the differences between air cooling and water cooling．To date ，no report is yet available on the effects of both cooling methods on granite's physi-
