三维地应力测量过程中应力释放规律分析  

Analysis on stress releasing law in 3D geostress measuring process

作　　者：贾龙 王成虎[2] 

机构地区：[1]中国地质科学研究院岩溶地质研究所,广西桂林541004 [2]中国地震局地壳应力研究所,北京100085

出　　处：《人民长江》2012年第5期47-50,105,共5页Yangtze River

基　　金：国家自然科学基金青年基金项目(40704018);中央级公益性科研院所基本科研业务费专项资金资助项目(ZDJ2009-5)

摘　　要：应力解除法是测量三维原地应力的重要方法,但其测量原理是建立在应力完全释放的情况下,忽视了应力是逐渐释放的过程,因此有必要探究应力释放规律。利用数值模拟方法,对应力释放与解除深度、地应力状态和孔底温度关系进行研究,表明应力解除过程中存在应力残留,主要集中在岩芯底部,其分布与原地应力大小方向有关,并且钻孔温度对残留地应力影响也较为显著。各种情况下的钻孔残留应力波及高度一般在一个钻孔直径以内,因此测量原件应安放在距离岩芯底部一个钻孔直径的高度。Geostress relieving method is an important method of 3D original geostress measurement, but its principle is based on the complete release of geostress, which ignores that the stress is gradually released in the process ; therefore it is necessary to explore the stress releasing law. The numerical simulation method is used to research the relationship between the stress release and relieving depth, together with the geostress state and temperature at the bottom of hole. The results show that residual stress exists in the relieving process, wilich is primarily concentrated at the bottom of core. Moreover, its distribution is related with the magnitude and direction of the original geostress, while the residual stress is significantly affected by hole temperature. Under all the circumstances, the distribution height of the residual stress is usually less than a bole diameter, consequently, the measuring sensor should be placed at the range away the hole bottom one diameter.

关 键 词：地应力测量 套芯应力解除 数值模拟 3D-sigma 应力释放 

分 类 号：P642.2[天文地球—工程地质学]