深基坑预应力复合土钉支护稳定性的可靠性研究

Reliability Analyses of the Stability of Composite Prestressed Soil Nailing Retaining for Deep Excavation

复合土钉支护技术在深基坑工程中已得到了广泛的应用 ,目前对其支护稳定性的评价 ,均采用安全系数的方法 ,这种定值化的方法 ,没有考虑土体参数的空间分布特点。为了对复合土钉支护稳定性的评价有一个准确的指标 ,利用可靠性分析方法 ,明确了预应力锚杆对土钉墙的作用效果 ,并对其稳定性进行了可靠性研究 ,得出了失稳概率。通过对工程实例的分析 。

The Composite prestressed soil nailing retaining technique is widely used for deep excavation in China, but at present the safety factor method is adopted to evaluate the stability of this retaining pattern. This valued evaluation method doesn't take account of the space distributing properties of soil's parameters. In order to offer an exact excavation index of the stability of this retaining pattern, this article defines the effect of prestressed bolt to soil nailing retaining wall, adopts reliability analysis method to carry out the reliability analyses of the stability of this retaining pattern, and gives out the failure probability of soil nailing retaining wall. By analyses of engineering cases, the practicability of the analysis method is verified.