基于土拱效应的土钉支护间距临界值分析

根据深基坑支护中土拱效应的作用原理,把土钉与土共同作用下的复合土体看成是一个整体,通过对土钉的轴力与土体平均侧向压应力之间关系的分析,给出了土体平均侧向压应力分布规律的计算公式并进行了讨论,以此公式为依据推导了土钉支护边坡水平间距与竖直间距临界值的计算公式,通过某一工程对土钉布置的验算,对公式的可靠性进行了验证。

Critical value of soil-nailing spacing based on the soil-arch effect

According to the working principle of the soil arch effect for deep excavation protection.the compound soil is considered as a integrity,which composed by the corporate working of the soil-nailing and soil body.Starting from the relationship analysis between the axis force of soil-nailing and the average side stress of soil body,The calculationformula of distributing disciplinarian for the average side stress of soil body is proposed and discussed. with the result the critical value for the level and erect spacing of the soil nailing protection slope is detruded. the security of the formula is validated by checking the disposal of soil-nailing in practical project.