岩土力学Issue(z1)：292-298,7.
点荷载法测试易风化泥质岩强度的可靠性分析
Reliability analysis of measuring strongly weathered grey mudstone strength with point load measurement
摘要
Abstract
The most of construction coal mines in South of Sichuan province have been discovered with the difficult problems of much soft surrounding rock, easily weathering、developmental joint and fracture、large deformation、difficult support、multiple repairmen , which have influenced on the process of coal exploration and production in recent years. The soft style and severity should be conformed in order to choose the appropriate support technology. We investigated the engineering geology and choose the thick-bedded dark grey mud rock mainly surrounding the roadway. The fresh rocks with irregular shape have been tested by the point load testing in tunnel. After the screening testing data with the method of Grubbs criterion, the rock strength has been calculated by the formula defined by the traditional method、International Society for Rock Mechanics (ISRM) standard rate and Chinese engineering standard specification. The random and system error about the result of calculation with different formulas is tested by the F-test and t-test. The results show that the average uniaxial compressive strength obtained by the traditional method and ISRM standard rate is more accuracy than the Chinese engineering standard specification. The strength is appropriate to the soft rock evaluation. The change factor of the mudstone strength is between 11%-30%, which is approach to the general uniaxial compressive strength. The point load testing is the credibility, fast, convenience and cheap way to obtain the strength of soft rock with difficult coring, which could be used to evaluate the difficulty of the soft rock engineering.关键词
点荷载试验/岩石强度/可靠性/标准差/适用性/分布规律Key words
point load test/rock strength/reliability/standard deviation/feasibility/regularities of distribution分类
建筑与水利引用本文复制引用
张国锋,刘志双,陈显坤,王永望,解毅..点荷载法测试易风化泥质岩强度的可靠性分析[J].岩土力学,2014,(z1):292-298,7.基金项目
中央高校基本科研基金资助（No.2012800015DQ）；教育部高校博士点基金资助（No.20130023120011）。 （）
