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针对锚喷支护设计中面层土压力计算模式存在的问题,以预应力锚杆柔性支护技术为研究对象,假定锚杆间的土拱为二维平面拱,推导出了一种作用在喷射混凝土面层上的土压力计算方法,得到了面层土压力的分布曲线。分析土体黏聚力c、内摩擦角?、外摩擦角?和锚杆水平间距l对面层土压力的影响,并与简仓法计算结果进行了对比。结果表明,?越小,面层土压力越大,且简仓法计算值明显小于文中计算值;c对面层土压力最大值无影响;面层土压力最大值与l成正比;?对面层土压力也有明显影响,在实际工程设计中,不应忽略?对减小面层土压力的贡献。最后给出了计算面层上的土压力简化公式。
Aiming at the existing problems of the surface soil pressure calculation mode in the design of shotcrete and rockbolt support, taking the prestressed anchor flexible support technology as the research object, assuming that the soil arches between the anchors are two-dimensional plane arches, The calculation method of earth pressure on shotcrete surface layer obtained the distribution curve of earth pressure on the surface layer. The influence of soil cohesion c, internal friction angle φ, external friction angle φ and anchor horizontal spacing l on the earth pressure is analyzed and compared with the results of the simplified method. The results show that the smaller the value of?, The larger the pressure of surface soil, and the calculated value of the simplified method is obviously smaller than the calculated value of the text; c has no influence on the maximum of earth pressure; the maximum of earth pressure is proportional to l; Soil pressure also has a significant impact, in the actual engineering design, should not be ignored? To reduce the contribution of surface pressure on the surface. Finally, a simplified formula for calculating earth pressure on the surface is given.