宁东地区深基础桩端极限承载力初探

为了确定宁东地区中风化的砂岩及泥岩桩的极限端阻力,结合宁夏宁东地区3个工程实例的试验研究,针对宁东地区具体工程的地质特点,应用深层平板载荷试验方法,以及试桩埋设有测量桩身应力、应变,桩底反力的传感器方法,测定桩的端阻力,对工程场区的深部地基、土层及大直径桩桩端持力层的承载力进行了评价.试验结果表明,宁东地区中风化的砂岩及泥岩桩的极限端阻力值远高于现行的《建筑桩基技术规范》JGJ 94—2008和《岩土工程手册》中所提供的桩的极限端阻力值.该试验研究为宁东能源重化工基地建设工程积累了宝贵的第一手资料,也为勘察设计单位优化基础方案设计、降低工程造价提供了依据.

Study on ultimate bearing capacity of deep foundation pile tip in East of Ningxia

Based on the experimental research of three engineering project in east of Ningxia,the purpose of the paper is to determine the sandstone areas of east of Ningxia weathering and mudstone pile and the extreme resistance.In east of Ningxia regions concrete engineering geological characteristics,application of deep plate loading test method,bury measurement pile body stress,strain,pile bottom force sensors and other methods,the determination of the pile tip resistance,the project area of deep foundation,and the soil and large diameter pile tip resistent layer.whereas the bearing capacity of the evaluation.The test results show that east Ningxia area weathered sandstone and mudstone in the pile tip limit bottom resistance value,far higher than the current ＂Technical Code for Building Pile Foundation＂ JGJ 94—2008 and the Geotechnical Engineering Manual is provided in the limit of the pile tip resistance value.Experimental study in this blank fill east of Ningxia in the future for the east Ningxia energy sources heavy chemical base construction project has accumulated a wealth of valuable first-hand material,also for survey and design optimization design based unit personnel,reduce the cost of project to provide the basis.