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中南大学学报(自然科学版)

Journal of Central South University

第51卷    第1期    总第305期    2020年1月

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文章编号:1672-7207(2020)01-0193-11
高温后花岗岩的物理力学特性试验研究
吴阳春1,郤保平1, 2,王磊3,牛新明3,王帅1,赵阳升1, 2

(1. 太原理工大学 矿业工程学院,山西 太原, 030024;
2. 太原理工大学 原位改性采矿教育部重点实验室,山西太原,030024;
3. 中国石油化工股份有限公司石油工程技术研究院,北京,100101
)

摘 要: 为研究高温后花岗岩的物理力学特性与温度变化的关系,对600 ℃范围内青海共和花岗岩自然冷却后进行单轴压缩、巴西劈裂和变角剪切试验。研究结果表明:从室温~600 ℃,花岗岩质量损失率随温度升高而增大,在300 ℃之前,花岗岩体积收缩,密度变大,在300 ℃后,花岗岩体积膨胀,密度变小;从室温~600 ℃,花岗岩的抗压强度,抗拉强度和抗剪强度(内聚力)随温度升高先变大后变小,弹性模量随温度升高单调递减,在250~600 ℃时,内摩擦角随温度升高而增大;400~600 ℃可视为花岗岩从脆性向延性转变的临界温度范围。基于弹性模量的损伤因子在400 ℃之后可以较好地反映岩石强度的热损伤程度。

 

关键词: 青海共和花岗岩;高温;抗压强度;抗拉强度;抗剪强度

Experimental study on physico-mechanical properties of granite after high temperature
WU Yangchun1, XI Baoping1, 2, WANG Lei3, NIU Xinming3, WANG Shuai1, ZHAO Yangsheng1, 2

1. College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
2. Key Laboratory of Insitu Property Improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China;
3. Sinopec Research Institute of Petroleum Engineering, Beijing 100101, China

Abstract:In order to study the relationship between the physico-mechanical properties of granite and the temperature, the uniaxial compression, Brazilian splitting and variable angle shearing experiments were carried out for Qinghai Gonghe granite within 600 ℃ after natural cooling. The results show that the mass loss rate increases with the increase of the temperature from room temperature to 600 ℃. Below 300 ℃, the volume shrinks and the density becomes larger. Over 300 ℃, the volume expands and the density becomes smaller. From room temperature to 600 ℃, the compressive strength, tensile strength and shearing strength (cohesion) of granite increase first and then decrease with the increase of temperature, and the elastic modulus decreases with the increase of temperature. From 250 ℃ to 600 ℃, the internal friction angle becomes larger with the increase of temperature. 400-600 ℃ can be regarded as the critical temperature range of granite changing from brittle to ductile. It is found that the damage factor based on the elastic modulus can well reflect the thermal damage degree of rock strength after 400 ℃.

 

Key words: Qinghai Gonghe granite; high temperature; compressive strength; tensile strength; shear strength

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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