土钉支护中超前锚杆的工作机理研究

Study on working mechanism of forepoling bolts in soil nailing protection

超前锚杆作为土钉基坑支护中的主要抗滑措施,在现有的土钉墙基坑支护结构设计中,仅验算其整体稳定性或`作为抗滑安全储备。将Ito and Matsui所提出的作用于排桩上的土压力理论应用于超前锚杆分析,研究了超前锚杆在土钉基坑支护中所起的抗滑作用,提出了带有超前锚杆的土钉墙稳定性分析方法,并得到工程实例的验证。通过研究可以提高土钉墙的设计理论,降低工程造价。

The forepoling bolts are used for major anti-sliding measure in soil nailing retaining and protection of foundation excavation. In the forthcoming design of soil-nailing retaining wall with forepoling bolts, the whole stability is only checked or they are used for safe reserve. This paper applies the theory of earth pressure acting on piles in a row, which had already been derived by Ito and Matsui, to analyze forepoling bolts. The anti-sliding action that the forepoling bolts take in the soil nailing retaining wall is studied. The stability analyzing method for the soil-nailing wall with the forepoling bolts is expounded; and it has been verified by an engineering example. By studying the soil-nailing wall with the forepoling bolts, its design theory will be greatly improved. Meanwhile, engineering cost will be decreased.