点荷载强度计算模型现场试验修正及效果验证  

Field Test Modification and Effect Verification of Point Load Strength Calculation Model

作　　者：陶志刚[1,2] 王翔 毛亚东 TAO Zhigang;WANG Xiang;MAO Yadong(School of Mechanics and Civil Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China;State Key Laboratory for Geomechanics and Deep Underground Engineering,Beijing 100083,China)

机构地区：[1]中国矿业大学(北京)力学与土木工程学院,北京100083 [2]深部岩土力学与地下工程国家重点实验室,北京100083

出　　处：《金属矿山》2024年第11期55-61,共7页Metal Mine

基　　金：越崎学者专项基金项目(编号:800015Z1207);深部岩土力学与地下工程国家重点实验室开放基金项目(编号:Z020007)。

摘　　要：点荷载试验为常用的岩石单轴抗压强度间接测试方法,对工程设计和施工开展具有指导作用。针对点荷载强度指数计算方法展开研究,在进行大量实际点荷载试验获得相应结果的基础上,对试验数据进行统计分析并在计算公式中引入新的变量以期对现有的点荷载强度计算方法进行优化。对长山壕金矿岩体进行了采样、试样制备与点荷载试验,采用统计方法对点荷载试验结果进行分析得出优化方法,并以同采区同位置岩样的单轴抗压强度作为参考值,将多种计算结果与参考值进行了对比分析。结果表明:改进后方法的计算结果更贴近岩样实际单轴抗压强度,且相同试验、相同数据条件下的计算结果离散性处于较低水平,为现场试验条件有限时估算岩样单轴抗压强度提供了一种可靠的点荷载强度指数计算方法。The point load test is a commonly used indirect method for determining the uniaxial compressive strength of rocks,providing guidance for engineering design and construction.This study focuses on the calculation method of the point load strength index.Based on a large number of actual point load tests and their corresponding results,the experimental data are statistically analyzed,and new variables are introduced into the calculation formula so as to optimize the existing point load strength calculation method.Samples were collected from the Changshangou Gold Mine and subjected to point load tests after sample preparation.The point load test results were analyzed using statistical methods to derive an optimized approach.The uniaxial compressive strength of rock samples from the same mining area and location was used as a reference value,and the various calculation results were compared and analyzed against this reference value.The results show that the improved calculation method yields results closer to the actual uniaxial compressive strength of the rock samples,and the dispersion of the calculation results under the same experimental conditions and data is at a relatively low level.This provides a reliable point load strength index calculation method for estimating the uniaxial compressive strength of rock samples when on-site testing conditions are limited.

关 键 词：点荷载强度指数 单轴抗压强度 点荷载强度试验 计算方法 

分 类 号：TD315[矿业工程—矿井建设]