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余 莉,闫名卉. 热-液耦合作用下花岗岩单轴力学特性的实验研究[J]. 科学技术与工程, 2019, 19(31): 311-318.
YU LI.Experimental Study on Uniaxial Mechanical Properties of Granite under Thermo-hydraulic Coupling[J].Science Technology and Engineering,2019,19(31):311-318.
热-液耦合作用下花岗岩单轴力学特性的实验研究
Experimental Study on Uniaxial Mechanical Properties of Granite under Thermo-hydraulic Coupling
投稿时间:2019-04-25  修订日期:2019-07-02
DOI:
中文关键词:  
英文关键词:temperature  cycle water  cycle mechanical  properties granite
基金项目:河北省高等学校科学技术研究项目(编号:BJ2018046) ;神狐海域天然气水合物先导试验区试采实施(中国地质调查局水文地质环境地质调查中心)
     
作者单位
余 莉 河北大学
闫名卉 河北大学建筑工程学院
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中文摘要:
      为研究热-液耦合花岗岩单轴力学性能及破坏方式,对花岗岩进行不同温度作用下的热-液耦合循环处理,采用单轴压缩试验分析其力学特征的变化规律。结果表明:(1)峰值强度随温度升高而增加,50-100℃,降低11.51%,100-150℃,降低1.77%;峰值应变与循环温度呈线性拟合关系,随温度升高,峰值应变降低;弹性模量随温度上升而先变大后减小,上升幅度较明显约123.21%。(2)峰值强度随循环次数增加出现不同变化,3次循环前均处于缓慢变化,后面变化明显,3-4次,降低19.87%,4-5次,上升22.70%;峰值应变与循环次数呈多项式拟合关系,3次循环时取得最大值;弹性模量与循环次数呈多项式拟合关系,3次循环时取得最小值。(3)峰值强度在等值线图中,50-100℃,以3次循环呈对称分布;峰值应变随循环温度升高和循环次数变多而降低;弹性模量等值线图中出现双峰模式,随着温度升高,循环次数变多,弹性模量增加。(4)应力-应变曲线大致经历压密、弹性、屈服、破坏4个阶段,发生脆性破坏。破坏分为劈裂、剪切。可见,热-液耦合作用对花岗岩的力学特性是有一定影响的。
英文摘要:
      In order to study the uniaxial mechanical properties and failure modes of thermo-liquid coupled granite, the thermo-liquid coupling cycle treatment of granite under different temperatures was carried out, and the variation of mechanical characteristics was analyzed by uniaxial compression test. The results show that: (1) The peak intensity increases with increasing temperature. The peak intensity decreases by 11.51% When the temperature is in the range of 50-100 °C,the peak intensity is reduced by 1.77% when temperature is in the range of 100-150 °C; The peak strain is linearly related to the cycle temperature, it decreases as the temperature increases; The modulus of elasticity increases first and then decreases with increasing temperature, and the increase is about 123.21%. (2) As the number of cycles increases, there are different changes in peak intensity, it was slowly changed before 3 cycles, the peak intensity is reduced by 19.87% when the cycle is 3-4 times , the peak intensity is reduced by 22.70% when the cycle is 4-5 times ; The peak strain has a polynomial fit with the number of cycles, the peak intensity is maximum when 3 cycles, The elastic modulus has a polynomial fit with the number of cycles, the elastic modulus is Minimum when 3 cycles . (3) In the contour plot, the peak intensity is symmetrically distributed in 3 cycles at a temperature interval of 50-100 ° C; The peak strain decreases as the cycle temperature increases and the number of cycles increases, In the contour map, the elastic modulus exhibits a bimodal mode, and the modulus of elasticity increases as the temperature increases and the number of cycles increases. (4) The stress-strain curve undergoes four stages of compaction, elasticity, yielding and failure, and brittle failure occurs. Destruction is divided into splitting and shearing. It is concluded that the thermo-liquid coupling has a certain influence on the mechanical properties of granite.
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