摘要
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 unveil the distribution regularities of the soil pressure and anchor stress ofdispersed pressure retaining wall during construction and operations, test sections being chosen in theproject sites, soil pressure cell and anchor dynamometer are buried in the field, the variation regularities ofsoil pressure under base, soil lateral pressure, anchor plate pressure and anchor tension of new retainingwall during construction and operations time are studied. Monitoring results indicate that as filling heightincreases outside soil pressure is larger than inside soil pressure and the wall tilts outwards; when anchorinstalled inside soil pressure increases larger than outside soil pressure and the wall tilts inwards; and asthe construction continues inside soil pressure decreases while outside soil pressure increases; soil lateralpressure of raining wall varies nonlinearly with height, above the position of anchor soil lateral pressure ofraining wall increasing as depth increases, near the position of anchor soil lateral pressure decreasing witha minimum peak at the position of anchor, below the position of anchor soil lateral pressure decreasing asdepth increases. The tension of anchor has a fluctuant change during the construction and operation time.The resistance function of anchor plate to anchor effects within certain distance and the resistance functionis not obvious when out of range.
出处
《公路》
北大核心
2014年第6期36-40,共5页
Highway
关键词
边坡工程
压力分散型挡土墙
施工及运营期
土压力
锚索拉力
slope engineering
dispersed pressure retaining wall
construction and operation time
soilpressure
anchor tension
