关键词: 复杂膨胀性围岩, 交岔点, 全断面封闭, 有限让压, 支撑架

Abstract: In view of the technical problems of stability control and support in the high stress concentration area of the intersection point of roadway with complex expansion, the paper puts forward the difficulties and key points of support at the intersection point of roadway through the study and analysis of the deformation form and mechanism of surrounding rock at the intersection point of roadway. Based on the theoretical analysis of the rock control support at the intersection point, the flexible support with limited compressive pressure plus the rigid support technology with closed and compressive section is proposed. In the early stage, high strength and high prestress anchorages + anchor cables + grouting combined support are used to control the deformation of surrounding rock to a limited extent, allowing the surrounding rock of roadway to release the surrounding rock stress within a controlled range; In the later period, the deformation of the rock around the intersection point was effectively controlled by setting up a joint support body composed of a special-shaped support frame and a concrete injection to the surrounding rock at the intersection point. It ensures the overall control and stability of the rock deformation around the intersection point and achieves the expected support effect.