CAJ | 학술논문

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。
침대묘분지호설계중면층토압력계산모식존재적문제，이예응력묘간유성지호기술위연구대상，가정묘간간적토공위이유평면공，추도출료일충작용재분사혼응토면층상적토압력계산방법，득도료면층토압력적분포곡선。분석토체점취력c、내마찰각?、외마찰각?화묘간수평간거l대면층토압력적영향，병여간창법계산결과진행료대비。결과표명，?월소，면층토압력월대，차간창법계산치명현소우문중계산치；c대면층토압력최대치무영향；면층토압력최대치여l성정비；?대면층토압력야유명현영향，재실제공정설계중，불응홀략?대감소면층토압력적공헌。최후급출료계산면층상적토압력간화공식。
A new earth pressure expression is derived to calculate the earth pressure on the shotcrete of flexible retaining method with prestressed anchor in order to solve the computation model of earth pressure on the shotcrete in the anchor shotcrete support design on the base of two-dimensional soil arch. And the distribution of earth pressure on the shotcrete along the depth is established. The values of earth pressure from this paper are compared with those calculated by silo method from the Specifications of design for geological hazard stabilization for different soil parameters, such as soil cohesion c , soil internal friction angle?, soil-shotcrete friction angle ? and horizontal distance l between the adjacent anchors. The results show that the earth pressure on the shotcrete increases with decreasing ?; and values are greater than those calculated by silo method for a small ?. The maximum earth pressure is proportional to l while c has no effect on the maximum earth pressure. Variation in parameter ? has a significant effect on the earth pressure and should not be neglected for engineering design because of the contribution for decreasing the earth pressure on the shotcrete. Finally, a simplified expression for calculating earth pressure on shotcrete is provided.