岩石热膨胀系数实验研究及应用
Experimental study of thermal expansioon of rocks and its application
摘要
岩石的热膨胀系数是岩土工程领域重要的热物理参数之一。在多种涉及岩石变形（应变）的地应力测试方法中，由于温度变化引起的岩石热膨胀（收缩）变形，一定程度上影响了原地应力测试结果的可靠性。特别是在非弹性应变恢复（Anelastic Strain Recovery简称ASR）地应力测试方法中，由于岩石的非弹性变形相对较小，温度变化所引起的测量误差不容忽视。本文设计了新型岩石热膨胀变形实验系统，提高了测量岩石热膨胀变形的精度和长期稳定性，确定8种常见岩石0~60℃范围内的热膨胀系数为5.3~8.7×10-6/℃。同时开展了ASR地应力测量方法中由于测量开始时刻样品与水浴环境温差对测试结果影响的相关实验研究，研究结果为完善ASR地应力测量方法及相关研究提供了基础数据。
Abstract
Thermal expansion coefficient is one of the important physical parameters of rocks in geotechnical engineering field. In many in situ stress tests invoved in rock deformation (strain), the reliability of the in situ stress measurement result is affected to some extent by the thermal expansion of rocks caused by temperature change. Especially in the Anelastic Strain Recovery (ASR) in situ stress test method, the anelastic recovery deformation of rock is relatively small, the measurement error caused by temperature changes cannot be ignored. In this paper, a new thermal expansion of rock deformation experimental system is designed, and the accuracy and long term stability are improved. The thermal expansion coefficient of 8 kinds of common rocks are 5.3~8.7×10-6/℃ within the temperature range of 0~60℃. At the same time, the effect study of temperature difference between of rock sample and constant temperature environment at the beginning of ASR test was carried out. The research results provide basic data for improving ASR in situ stress measurement method and relevant research fields.关键词
岩石/热膨胀系数/地应力/ASRKey words
rock/thermal expansion coefficient/in situ stress/ASR引用本文复制引用
高禄,孙东生.岩石热膨胀系数实验研究及应用[EB/OL].(2014-07-21)[2026-04-01].http://www.paper.edu.cn/releasepaper/content/201407-248.学科分类
地质学/矿业工程理论与方法论/矿山地质、矿山测量
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