目的调查分析广西石灰石露天采场凿岩和破碎岗位生产过程中粉尘浓度情况与风险等级。方法2015—2019年对广西40家石灰石露天采场凿岩和破碎岗位职业病危害因素进行检测,通过EASC-IHSTAT对粉尘检测结果进行统计学分析,采用国际采矿与金...目的调查分析广西石灰石露天采场凿岩和破碎岗位生产过程中粉尘浓度情况与风险等级。方法2015—2019年对广西40家石灰石露天采场凿岩和破碎岗位职业病危害因素进行检测,通过EASC-IHSTAT对粉尘检测结果进行统计学分析,采用国际采矿与金属委员会(International Commission on Mining and Metals,ICMM)职业健康风险评估法、中国安全生产科学研究院职业卫生定性风险评价法以及GBZ/T 229.1—2010《工作场所职业病危害作业分级第1部分:生产性粉尘》进行职业危害因素风险水平分级。结果石灰石露天采场凿岩和破碎岗位工人接触的石灰石粉尘(呼吸性粉尘)时间加权平均浓度(Concentration time-weighted average,CTWA)平均值分别为(3.645±2.168)和(2.705±1.348)mg/m^(3),超标率分别为37.50%和25.00%;ICMM定量法风险评估模型的评估结果均为不可容忍,职业卫生定性风险评价法评估职业危害因素风险水平均高,工作场所石灰石粉尘危害作业分级均为0级(相对无害作业)至Ⅰ级(轻度危害作业)。两种风险评估模型分级结果大致相同,与检测结果基本一致。结论现有条件下凿岩和破碎岗位石灰石粉尘仍可能会对作业工人的健康造成负面影响,应加强综合防治措施以降低作业人员实际接触水平以及危害的风险程度。展开更多
The size distribution of a muck pile depends not on only the blasting standard but also on the mechanical properties,joint system,and crack density of the rock mass. As,the cracks in the rock masses are especially hea...The size distribution of a muck pile depends not on only the blasting standard but also on the mechanical properties,joint system,and crack density of the rock mass. As,the cracks in the rock masses are especially heavily developed at the limestone quar- ries in Japan,they,along with the joints,have a large impact on the effects of blasting, such as the size of the muck pile.Therefore,if the joint system and/or crack density in a rock mass can be determined and quantitatively evaluated,the blasting operation can be conducted more effectively,efficiently and safely.However,guidelines for designing ap- propriate blasting standards based on the rock mass conditions have not yet been scien- tifically developed.Therefore,blasting tests were conducted on different mines and faces, under different geological conditions and blasting standards,in order to determine the im- pacts of each factor on the effects of blasting.Summarized the results of a series of blast- ing tests and described the impacts of geological conditions on the size of the muck pile produced by blast.展开更多
文摘目的调查分析广西石灰石露天采场凿岩和破碎岗位生产过程中粉尘浓度情况与风险等级。方法2015—2019年对广西40家石灰石露天采场凿岩和破碎岗位职业病危害因素进行检测,通过EASC-IHSTAT对粉尘检测结果进行统计学分析,采用国际采矿与金属委员会(International Commission on Mining and Metals,ICMM)职业健康风险评估法、中国安全生产科学研究院职业卫生定性风险评价法以及GBZ/T 229.1—2010《工作场所职业病危害作业分级第1部分:生产性粉尘》进行职业危害因素风险水平分级。结果石灰石露天采场凿岩和破碎岗位工人接触的石灰石粉尘(呼吸性粉尘)时间加权平均浓度(Concentration time-weighted average,CTWA)平均值分别为(3.645±2.168)和(2.705±1.348)mg/m^(3),超标率分别为37.50%和25.00%;ICMM定量法风险评估模型的评估结果均为不可容忍,职业卫生定性风险评价法评估职业危害因素风险水平均高,工作场所石灰石粉尘危害作业分级均为0级(相对无害作业)至Ⅰ级(轻度危害作业)。两种风险评估模型分级结果大致相同,与检测结果基本一致。结论现有条件下凿岩和破碎岗位石灰石粉尘仍可能会对作业工人的健康造成负面影响,应加强综合防治措施以降低作业人员实际接触水平以及危害的风险程度。
文摘The size distribution of a muck pile depends not on only the blasting standard but also on the mechanical properties,joint system,and crack density of the rock mass. As,the cracks in the rock masses are especially heavily developed at the limestone quar- ries in Japan,they,along with the joints,have a large impact on the effects of blasting, such as the size of the muck pile.Therefore,if the joint system and/or crack density in a rock mass can be determined and quantitatively evaluated,the blasting operation can be conducted more effectively,efficiently and safely.However,guidelines for designing ap- propriate blasting standards based on the rock mass conditions have not yet been scien- tifically developed.Therefore,blasting tests were conducted on different mines and faces, under different geological conditions and blasting standards,in order to determine the im- pacts of each factor on the effects of blasting.Summarized the results of a series of blast- ing tests and described the impacts of geological conditions on the size of the muck pile produced by blast.
