点荷载法测试易风化泥质岩强度的可靠性分析

›› 2014, Vol. 35 ›› Issue (S1): 292-298.

点荷载法测试易风化泥质岩强度的可靠性分析

张国锋¹，刘志双³，陈显坤²，王永望³，解毅¹

1.中国矿业大学（北京）力学与建筑工程学院，北京 100083；2.四川省煤炭产业集团有限责任公司，成都 610091； 3.中国矿业大学（北京）资源与安全工程学院，北京

收稿日期:2013-10-07 出版日期:2014-06-10 发布日期:2014-06-20
作者简介:张国锋，男，1982年生，博士后，讲师，硕士生导师，主要从事深部岩石力学与煤矿开采研究
基金资助:
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）。

Reliability analysis of measuring strongly weathered grey mudstone strength with point load measurement

ZHANG Guo-feng¹, LIU Zhi-shuang³, CHEN Xian-kun², WANG Yong-wang³, XIE Yi¹

1. School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing 100083, China; 2. Sichuan Coal Industry Group Limited Liability Company, Chengdu 610091, China; 3. School of Resources and Safety Engineering, China University of Mining and Technology, Beijing 100083, China

Received:2013-10-07 Online:2014-06-10 Published:2014-06-20

摘要/Abstract

摘要： 在川南地区在近年的煤炭开发过程中，多数基建矿井在巷道开拓期间大量出现围岩软弱、易风化、节理裂隙发育、变形大、支护难、多次返修等严重困扰矿井正常投产的支护难题，为合理选取支护技术，必须对软岩类型及等级进行划分。首先进行地质工程调查，选择巷道主要分布的厚层黑灰色泥岩为研究对象，在井下采用点荷载测试仪对新鲜不规则岩块进行强度测试。在对可疑数据采用Grubbs准则进行取舍后，采用传统法、ISRM法、工程分级法分别进行点荷载强度计算，所得结果采用F检验法和t检验法对各公式计算结果进行随机误差和系统误差检验，研究各方法的适宜性。研究发现，在对泥岩进行点荷载测试时，传统法和ISRM法较工程分级法所得单轴抗压强度平均值的随机误差和系统误差小，更适宜作为该类岩性进行工程软岩分级评价时的重要指标；点荷载所获泥岩强度值的偏差系数在11%～30%范围内，与一般岩石单轴抗压强度测定值偏差系数接近，具有可靠、快速、方便、费用低的优点，适宜作为围岩取样困难的巷道进行软岩类型评价的测试方法。

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

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.

Key words: point load test, rock strength, reliability, standard deviation, feasibility, regularities of distribution

中图分类号:

TU 452

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]. , 2014, 35(S1): 292-298.

ZHANG Guo-feng , LIU Zhi-shuang , CHEN Xian-kun , WANG Yong-wang , XIE Yi，. Reliability analysis of measuring strongly weathered grey mudstone strength with point load measurement[J]. , 2014, 35(S1): 292-298.

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