论文部分内容阅读
本文对19组岩样的800个试件进行了点荷载、单轴压缩和直接拉伸试验,对点荷载作用下岩石试件的破坏机制进行了观察和分析,认为点荷载强度I_s(50)是岩石材料拉压强度的综合反映,不同岩样的I_(s(50))与其单轴抗压强度σ_c及直接抗拉强度σ_t之间,一般不存在一一对应的关系。研究了压头贯入量对I_(s(50))的影响,提出了“视贯入量”和“真贯入量”的概念,提出了直接用I_(s(50))进行铁路岩石强度分级的标准。本文还对点荷载试验的可信度以及含水量、加载速率、压头与试件表面接触点的选择对I_(s(50))的影响进行了探讨。
In this paper, the point loads, uniaxial compression and direct tensile tests were performed on the 800 specimens of 19 rock samples. The failure mechanism of rock specimens under point load was observed and analyzed. The point load strength I_s(50) was considered. It is a comprehensive reflection of the tensile strength of rock materials. There is generally no one-to-one correspondence between I_(s(50)) and the uniaxial compressive strength σ_c and direct tensile strength σ_t of different rock samples. The influence of indenter penetration on I_(s(50)) was studied, and the concept of “intraocular penetration amount” and “true penetration amount” were proposed, and the direct use of I_(s(50)) for railway rock was proposed. Graded intensity criteria. In this paper, the reliability of the point load test and the influence of the water content, the loading rate, the contact point between the indenter and the specimen on the I_(s(50)) are discussed.