大直径中深孔松动爆破在施工中的应用

1概述“强化管理，落实责任”，铁路线、桥工程施工在新形势下，面临着新的更严格的挑战，对“安全、质量、工期”提出了更高的要求，对于 每一项工程的施工，必须保证以上三点的目标实现。尤其是对更改项目、安全要求更严，要确保万无一失。因此，在既有线上或附近施工是 每一名铁路工作者长期研究的课题。下面我就结合济泰三线的施工，谈一下在既有线附近开挖石方采用大直径中深孔爆破法，结合微差挤压松动爆破技术，如何能够保证行车安全及施工质量、工期。济泰三线开挖石方采用爆破施工。尤其在义灵关南侧山体爆破，难度很大，需要科…     

Simulation of excess pore water pressure during deep soil mixing columns installing

Most of current studies of deep soil mixing (DSM) methods are focused on the soil strength improvement and soil treatment effectiveness. But the DSM installation leads to excess pore water pressure and soil disturbance, which will bring great harm to adjacent structures, such as shell tunnels and historic buildings. The procedure of excess pore water pressure buildup while large number DSM columns are installed is complicated. In order to find methods to predict and simulate the excess pore water pressure during DSM column installation, the complicated dissipation and buildup of excess pore water pressure through in-situ test are studied in this paper. In-situ test was conducted in soft clay near the Huangpu River in Shanghai. The pore water pressure was investigated by an automatic monitoring system. Test results indicate that the excess pore water pressure induced by one DSM column installation is composed of the compaction pressure and the reversing pressure. The empirical equations of excess pore water pressure dissipation and buildup were built by mathematical fitting methods. A compound method is proposed to simulate the excess pore water pressure due to DSM installation. Using this method to predict the excess pore water pressure in the situ test, results show a well agreement between the prediction and the measurements.     

隧道施工中几个问题的探讨、分析和建议

文章论述了机械设备在隧道施工变化,分析了当前隧道施工中机械设备配套、隧道软弱围岩支护和隧道施工用水等方面的现状、存在问题,并提出了改进意见.     

粉喷桩复合地基承载力的评定方法

介绍了利用静载试验确定粉喷桩复合地基承载力的试验装置,试验方法及其承载力评定方法。     

原材料含泥量对沥青混合料技术指标的影响

用数据和试验手段论述原材料含泥量对沥青混凝土混合料马氏指标的影响,从另一个方面论述原材料质量对沥青混合料技术指标的影响程度.提出引入综合指标控制的方法,控制混合料质量.     

大跨径预应力混凝土箱梁桥温度效应

通过在中部地区某大跨径预应力桥梁箱梁桥典型截面埋设温度传感器及应变计,对箱梁截面温度场及温度效应连续观测,掌握公路大跨径预应力混凝土箱梁桥顶、底板温度分布规律,推出适合中部高温环境下的箱梁温度梯度模式,并将有限元计算值与现场实际温度效应测量数据进行对比分析,证明现场温度梯度推导公式的合理性,进而给出适合中部高温环境地区桥梁温度梯度的合理模式。     

基于模糊AHP综合评价方法的航运公司综合实力评价

提出了—种基于模糊AHP的综合评价方法,从客户的角度对航运公司的综合实力进行了综合评价、排序。经过分析计算,结论基本合理,且本方法简单实用。不但为企业选择优良的航运企业提供了理论依据,同时也为航运公司在航运市场中的位置定位提供了帮助,为其弥补不足提升综合实力提供参考。两种评价方法单独使用各有自己的缺陷,将其相结合,弥补各自的缺陷,形成一个综合评价方法。