软质岩、片状风化岩、碎裂岩等地基承载力取值探讨

Discussions on the Bearing Capacity of Soft Lamellar Weathered and Broken Rock Mass

岩石地基承载力,一般根据岩芯单轴抗压强度试验结果,经过一定的折算得出。但在实际工程中,软质岩、片状风化岩、碎裂岩等因取样困难、风化崩解、制样扰动等原因,导致或无法制样进行岩芯单轴抗压试验,或岩芯单轴抗压强度缺乏代表性。对软质岩、片状风化岩、碎裂岩场地岩石地基承载力取值的实际困难和风险进行了分析,指出验槽阶段检测单位提供的岩石单轴抗压强度存在的问题。在分析地基受力、岩芯抗压、原位载荷试验关系的基础上,提出了软质岩、片状风化岩、碎裂岩场地岩石地基承载力,必须结合试验数据、地质环境等进行综合评价,提供地基承载力的区间范围的建议。

The bearing capacity of rock mass is generally estimated from the uniaxial compressive strength test results of the intact rock core.However,in the practical engineering,the soft rock,the lamellar weathered rock,and the broken rock and other reasons such as sampling difficulties,weathering,disintegration and sample preparation disturbance,result in no intact rock core or no representative intact rock core for the uniaxial compressive strength tests.In this paper,the potential difficulties,and risks of estimating the bearing capacity of the rock mass in the broken rock site are analyzed.At the same time,the problems of the uniaxial compressive strength of the intact rock provided by the testing unit during the excavation stage are provided.Based on the analysis of the relationship between foundation loading,uniaxial compressive strength test results.plate loading test results,it is proposed that the bearing capacity of the rock mass for the soft rock,the lamellar weathered rock and the broken rock sites must be comprehensively evaluation based on test data and geological environment,and the suggestions of the range of bearing capacity of the rock mass are provided.