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在普通土钉墙的中部设置平台形成阶式土钉墙。与普通土钉墙相比,由于台阶的存在改变了土压力分布形态,改变了土体的应力应变状态,其变形、土钉内力小于普通土钉墙,稳定性也优于普通土钉墙。台阶位置和台阶宽度是影响阶式土钉墙工作性状的重要因素。根据计算分析及工程经验,对于均质土边坡,台阶应设置在0.6倍的基坑深度左右的位置处,效果比较明显;对于基坑中部有软弱夹层的情况下,台阶应设置在软弱层顶面处。建议阶式土钉墙的台阶宽度不宜小于0.1倍的基坑深度。通过一个实际工程,将普通土钉墙与阶式土钉墙进行对比,工程实践表明:阶式土钉墙可以有效地减小土钉内力和土钉墙变形、提高整体稳定安全度。
In ordinary soil nailing wall in the middle of the platform to form a step-type soil nailing wall. Compared with ordinary soil nailing wall, because of the existence of steps, the distribution of earth pressure is changed and the stress-strain state of soil is changed. The internal force of soil nailing is smaller than that of common soil nailing wall and the stability is better than ordinary soil nailing wall. The position of the step and the width of the step are important factors that affect the working properties of the stepped soil nailing wall. According to the calculation and analysis and engineering experience, for the homogeneous soil slope, the step should be set at about 0.6 times the depth of the foundation pit, the effect is obvious; for the middle of the pit there is a weak interlayer, the step should be set in the weak layer At the top. It is recommended that the step width of the stepped soil nailing wall should not be less than 0.1 times the depth of the foundation pit. Through a practical project, comparing ordinary soil nailing wall with stepped soil nailing wall, the engineering practice shows that the stepped soil nailing wall can effectively reduce the internal force of soil nailing and soil nailing wall deformation, and improve the overall stability and safety.