温度和含水状态对岩石劈裂强度影响的试验研究  

Experimental study of the effect of temperature and moisture state on rock Brazilian splitting strength

作　　者：王冲[1,2] 赖远明[2] 尤哲敏[2] 杨勇 余东合 刘国华 

机构地区：[1]兰州大学土木工程与力学学院,甘肃兰州730000 [2]中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室,甘肃兰州730000 [3]中国石油华北油田公司,河北任丘062552 [4]中国石油华北油田公司采油工程研究院,河北任丘062552

出　　处：《冰川冻土》2016年第5期1317-1324,共8页Journal of Glaciology and Geocryology

基　　金：国家自然科学基金项目(41230630);中国科学院"西部行动计划"项目(KZCX2-XB3-19);国家重点基础研究发展计划(973计划)项目(2012CB026102);中国石油华北油田公司采油工程研究院项目(HBYT-CYY-2014-JS-90)资助

摘　　要：岩土类材料的强度强烈依赖于含水率和温度条件.以兰州兰山砂岩为研究对象,分别进行了不同温度(+20℃、-5℃、-10℃)和不同含水率(干燥、天然含水率和饱和状态)条件下岩石的巴西圆盘劈裂试验.试验结果表明,常温下,岩石抗拉强度随含水率增加而急剧减小,试样饱和时软化、崩解,丧失承载能力;在不同负温条件下,天然含水状态的试样抗拉强度最大,干燥状态下最小;在-10^+20℃范围内,干燥岩石强度随温度升高,抗拉强度增大,含水岩石均是随温度升高,抗拉强度减小,但饱和岩石在-5℃时抗拉强度最大.含水率和温度对岩样强度的影响存在临界值,超过临界值,岩样强度随上述因素反向变化.试验结论为岩土类材料劈裂强度的标准化测试及其工程应用提供了重要的基础数据参考.The tensile strength of rock depends on moisture contents and temperatures. In order to study the mechanical properties of sandstone sampled from Lanzhou, Brazilian splitting test was carried out to investigate sandstone＇s tensile strength under different temperatures （ ＋ 20 ℃, - 5 ℃, - 10 ℃ ） and different moisture contents （dry, natural and saturated）. The test results showed that the tensile strength of sandstone decreases sharply with moisture content, until it softens to disintegration and loses bearing capacity due to saturation. When temperature less than 0 ℃, the specimens at natural water state has tensile strength always higher than those at dry state. When temperatures change between - 10 ℃ and ＋ 20 ℃, the tensile strength of dry rock increases with temperature, but the tensile strength of saturated rock reaches the maximum at -5 ℃. There are critical values for the moisture content and temperature effects, exceed the critical values, the relationship between the tensile strength of the rock and the moisture content or temperature will be inverted. These results will be useful for testing the tensile strength of rock and forecasting rock strength.

关 键 词：岩石力学 巴西劈裂试验 温度 含水率 抗拉强度 

分 类 号：TU458.3[建筑科学—岩土工程]