锚杆排桩基坑支护效果及其对周围环境的影响

利用理正深基坑软件，以具体工程的一侧基坑支护为例，分别改变锚杆预应力大小、锚杆排数和土压力调整系数，通过分析计算结果中位移、锚杆锚固段长度和钢筋用量的变化来研究其对锚杆排桩基坑支护效果及其对周围环境的影响。结果表明：对1排锚杆排桩，当预应力增加到一定值后，继续增加预应力值，对减小基坑位移的作用不大，但钢筋用量却会显著增加；用2排锚杆排桩对变形控制的效果明显，并且钢筋用量和对周围环境的影响均小；随着土压力调整系数的增加，基坑的位移、钢筋用量都在增加。因此，选择合适的土压力调整系数，让基坑发生适当的位移，才能使计算中采用的主动土压力和实际的土压力接近，使设计的基坑支护稳定可靠。

Effects of Anchor-Pile to Foundation Pit Support and Its Influences on the Surroundings

Lizheng software for deep foundation pit was used to analyze one side of a real project. By changing the value of pre-stress, number of anchor line and adjusting the parameter of soil pressure, the change of displacement, lengthen of anchored part and steel consumption were calculated and analyzed to study the effects of anchor-pile in foundation pit support and its influences on the surroundings. Study results showed that for one line anchor-pile, when the pre-stress increases to a certain value, pre-stress increasing was no longer useful to decrease foundation displacement, but steel consumption would be increased obviously. Two lines of anchors without pre-stress had an obvious effect on foundation deformation control, and it led to less steel consumption and slight surroundings influence. Only by selecting a proper adjustment parameter of soil pressure, letting the foundation pit to form proper displacement, the active soil pressure adopted in calculation can be closed to the practical one and the design of foundation pit support can be stable and reliable.