桩锚直径等对水泥土桩锚墙支护影响

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。

Influence of diameter of pile anchor etc on braced structure of cement soil pile anchor wall

With soil body adopting the hyperbolic hardening model and cement-soil pile wall and anchors elastoplastic one, the influence of anchors’ diameter and length on the supportive structure has been calculated and analyzed. The results show, on the condition that the diameter reaches over 400 mm, such effects in the saturated soft clay as replacement, occupation and reinforcement are obvious; thus distinctively controlling the coping’s horizontal displacement and settlement of the soil mass behind the retaining wall; while less than 200 mm, all the functions vanish thus lowering the active reinforcement. As the anchor’s length arrives at 1.6 times as long as the excavation depth, the coping’s horizontal displacement and soil mass’s settlement behind the retaining wall would be under control in the efficient way, while exceeding that all the effects are not that clear. Compared to the monitoring data from the same foundation pit, calculated and measured values bear great repeatability and regularity.