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风化岩体宏观力学参数的合理确定一直是重要研究对象,文章通过对杭州千岛品湖度假村风化岩体工程进行全范围内采集岩石试块,进行室内点荷载试验和单轴压缩试验,确定该岩石工程中岩石点荷载强度与单轴抗压强度的转换关系,从而在工程上利用点荷载强度转换得到岩石强度.利用回弹仪对现场岩体进行地质强度指标(GSI)分类,确定GSI值和mi值,提出根据现场岩体中的砂岩与泥岩(S/P)的比值来对单轴抗压强度σc和mi进行折减从而充分考虑岩石风化对岩体强度的影响,最后通过霍克—布朗准则确定工程上常用的岩体宏观力学参数c′和φ′.结果表明:风化岩体的岩石点荷载强度与单轴抗压强度的转换关系是变化的,文章所研究对象的转化系数为8.32,非固定的经典转换系数(K=24).通过这方法确定的宏观力学参数更准确,具有现实工程意义.
Reasonable determination of macroscopic mechanical parameters of weathered rock mass has always been an important research object. Through the whole range of rock mass specimen acquisition of weathered rock mass project of Hangzhou Qiandao Lake Resort, indoor point load test and uniaxial compression test were conducted to determine the rock The relationship between rock point load strength and uniaxial compressive strength in engineering is used to get the strength of rock by using the point load strength transformation.The classification of geological intensity index (GSI) of rock mass by using the rebound meter is carried out to determine the GSI value and mi value, it is proposed to reduce the uniaxial compressive strength σc and mi according to the ratio of sandstone to mudstone (S / P) in the rock mass so as to fully consider the influence of rock weathering on rock mass strength. Finally, Brown’s criterion is used to determine macroscopic mechanical parameters c ’and φ’ of rock mass commonly used in engineering.The results show that the relationship between rock point load strength and uniaxial compressive strength varies with weathering rock mass.The conversion coefficient of the object studied is 8.32, non-fixed classical conversion coefficient (K = 24) The macroscopic mechanical parameters determined by this method are more accurate and have realistic engineering significance.