大口径长距离土压平衡式顶管施工技术

我国管道工程施工采用的顶管设备大多有三种类型：Ф1500mm以下用泥水平衡式顶管设备;Ф1500mm以上大多采用土压平衡式顶管设备;Ф2600mm至Ф3000mm为大口径顶管,在一般情况下,超过Ф3000mm应采用盾构机施工。该文以天津市某人防工程的顶管施工技术为例,指出：大口径长距离采用土压平衡式顶管施工,应保证提高整体施工效率,充分发挥设备技术潜能。     

Numerical modeling of ground response during diaphragm wall construction

Construction of diaphragm wall panels may cause considerable stress changes in heavily overconsolidated soil deposits and can induce substantial ground movement. The 3D Lagrangian method was adopted to model the mechanical response of ground, including horizontal normal stress and shear stress, lateral ground displacement and vertical ground surface settlement, during the slurry trenching and concreting of diaphragm wall panels. Numerical results show that slurry trenching leads to horizontal stress relief of ground, reducing the horizontal stress of the ground from initial K0 pressure to hydrostatic betonite pressure. Wet concrete pressure lies between the hydrostatic bentonite pressure and the initial K0 pressure, so it can compensate partially the horizontal stress loss of the ground adjacent to the trench and thus reduce the lateral movement of the trench face as well as the vertical settlement of the ground surface.     

浅谈水中墩桩的施工

本文结合钻孔灌注桩施工实践,根据水中墩桩的施工特点与要求,从泥浆布局,清渣排浆,泥浆固化处理,成孔,钢筋笼,灌注水下混凝土等方面作了较全面的阐述。     

黏性土中考虑成孔卸荷的灌注桩侧摩阻力研究

钻孔灌注桩由于机械类型、钻头直径、成孔时间、泥浆性能、土层特性等的不同,使得成孔时间和孔壁形状各不相同,造成成桩后的钻孔灌注桩桩侧极限摩阻力具有一定的不确定性。该文通过建立黏性土中灌注桩侧摩阻力计算模型,依据荷载传递微分方程推算桩体系荷载传递函数,将理论解与模型试验结果对比,研究成孔相关参数对黏性土中钻孔灌注桩承载性能的影响。     

新型聚合物泥浆性能试验研究

本文研究对比新型聚合物泥浆XN、SM泥浆和目前杭州湾使用的增稠剂（PAC）的各项性能，结果表明：在相同条件下，聚合物泥浆XN的马氏漏斗粘度均高于SM泥浆，而且XN泥浆的性能也优于目前杭州湾使用的增稠剂（PAC）；与SM泥浆相比。XN泥浆具有更好护壁稳定性和更强的浆液沉渣净化性能。     

砂土地层钻孔桩采用片石泥浆护壁简介

本文介绍了３１８国道滠水公路大桥砂土地基钻孔桩采用片石泥浆护壁冲击成孔的施工方法和效果。     

在沿海石坝上进行地下连续墙成槽施工的体会

简述在石坝上进行地下连续墙成槽施工作业时需注意的土体置换，导墙选型，泥浆护壁等问题及体会。     

泥浆护壁钻孔灌注桩施工质量监理

介绍在多个泥浆护壁钻孔灌注桩施工监理过程中逐渐积累的灌注桩质量监理的经验体会。