赤平投影法在积石峡水电站泄洪洞与导流洞交叉段设计中的应用

针对积石峡水电站泄洪洞与导流洞交叉段大洞室，采用赤平投影法对洞室与岩体不同产状裂隙面组合形成的楔形体进行稳定性分析，通过判别关键块体，计算净滑动力，确定最终的可能可动块体及关键块体，选取最不利断面进行计算分析，绘制该断面可能最大可动域，确定锚固措施。对洞室锚固施工提供了可靠的设计依据，确保了施工安全。

Application of equatorial projection in crossing design of Jishixia tunnels

For the large crossing section of the spillway and diversion tunnels, equatorial projection method is used to analyze the stability of wedge body formed by the combination of different occurrence and fissure surface. Through judging the critical block and calculating net sliding force to determine the final movable blocks and critical blocks, analysis of the most unfavorable section is made, the possible largest movable area is mapped to determine the rock - bolting measures, which provides reliable design basis for rock - bolting of tunnels and ensures the construction safety.