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为了揭示压力分散型挡土墙在施工期和运营期的不同时期内土压力和锚索受力分布规律,在工程现场选取了试验段,在现场埋设土压力盒、锚索测力计等监测仪器,研究了该新型挡土墙在施工期及运营期的基底土压力、侧向土压力、锚定板压力及锚索拉力的变化规律。监测结果表明,随着填土高度的增加,基底外侧土压力高于内侧土压力,墙体外倾;布设锚索后,内侧土压力增幅较大,墙体内倾;随着运营期的增长,墙体内侧土压力减少,外侧土压力增加,挡墙有外倾倾向。挡墙侧向土压力随高度呈现非线性变化,挡墙的侧向土压力在锚索位置以上随着深度的增加呈增大趋势;靠近锚索位置时,侧向土压力减少,在锚索位置处出现一个最小峰值;在锚索位置以下,随着深度的增加而增大。锚索拉力在施工期和运营期内呈波动变化。锚定板对锚索的约束作用在一定距离内有效,超过一定距离,锚定板的约束作用不明显。
In order to reveal the law of earth pressure and force distribution of pressure-relief retaining wall during different periods of construction and operation period, the test section was selected at the project site, and the earth pressure box and cable dynamometer were buried at the site Instrument, the change law of base earth pressure, lateral earth pressure, anchor plate pressure and anchor cable tension of this new retaining wall during construction and operation period was studied. The monitoring results show that with the increase of fill height, the earth pressure outside the foundation is higher than the earth pressure inside, and the wall is camber. After the anchor cables are laid, the earth pressure inside increases greatly and the wall is lean. With the increase of operation period, Soil pressure inside the wall to reduce the pressure on the outside soil, retaining wall has a tendency to camber. Lateral earth pressure on the retaining wall shows a nonlinear change with height. Lateral earth pressure on the retaining wall increases with depth as the earth pressure increases. When approaching the anchor cable, the lateral earth pressure decreases, A minimum peak appears at the location; below the location of the anchor, it increases with depth. The tension of anchor cable fluctuates during the construction and operation periods. The anchoring effect of anchoring plate on the anchor cable is effective within a certain distance, beyond a certain distance, the anchoring plate restraint effect is not obvious.