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土体采用双曲硬化模型,水泥土桩墙和水泥土桩锚采用弹塑性模型,计算分析了水泥土桩锚直径和长度对水泥土桩锚墙支护结构的影响。计算结果显示,在计算条件下,桩锚直径大于400 mm时,桩锚在饱和软黏土中的置换、占位、加筋效果明显,控制墙顶水平位移和墙后土体沉降效果显著,桩锚直径小于200 mm时,将失去置换、占位、加筋作用,从而降低对墙后土体的主动加固效果。桩锚长度达到开挖深度的1.6倍时,能有效控制墙顶水平位移以及墙后土体沉降,桩锚长度超过1.6倍开挖深度以后,控制水平位移和墙后土体沉降的效果不明显。经与同一基坑的监测数据对比,计算值与实测值重复性好、规律性好。
The soil model is set by hyperbolic hardening model. The elasto-plastic model is used for the cement-soil pile wall and the cement-soil pile-anchor. The influence of the diameter and length of the cement-soil pile anchor on the anchoring structure of the cement-soil pile anchor wall is calculated and analyzed. The calculation results show that under the condition of calculation, when the pile diameter is more than 400 mm, the displacements, occupying place and reinforcement effect of pile-anchor in saturated soft clay are obvious, and the effect of controlling horizontal displacement of top wall and settlement of soil behind the wall is remarkable. When the diameter of the anchor is less than 200 mm, the displacement, occupancy and reinforcement will be lost, so as to reduce the active reinforcement effect on the soil behind the wall. When the pile length reaches 1.6 times of the excavation depth, the horizontal displacement of the wall and the settlement of the soil behind the wall can be effectively controlled. After the pile length exceeds the excavation depth of 1.6 times, the effect of controlling horizontal displacement and soil settlement behind the wall is not obvious . After comparing with the monitoring data of the same foundation pit, the calculated value and the measured value have good repeatability and good regularity.