【单选题】2 / 9岩石单轴强度 σc=80 MPa\sigma_c = 80\,\mathrm{MPa}σc=80MPa,β=0.5\beta = 0.5β=0.5,则岩体抗压强度 RcR_cRc 约为?A40 MPa40\,\mathrm{MPa}40MPa正确B160 MPa160\,\mathrm{MPa}160MPaC80 MPa80\,\mathrm{MPa}80MPaD20 MPa20\,\mathrm{MPa}20MPa参考答案A参考解析Rc=0.5×80=40 MPaR_c = 0.5 \times 80 = 40\,\mathrm{MPa}Rc=0.5×80=40MPa。