挤密桩复合地基原位测试检测方案

研究目的:要准确判断挤密桩处理地基的效果,就需要选择一种有效的方法进行测试。本文介绍的原位测试检测方法是在施工现场进行的一种检测方法。研究方法:原位测试是在挤密桩固化前进行静力触探测试,通过桩体不同固化材料的对比试验确定桩体比贯入阻力值和桩间土的比贯入阻力值的关系,利用这种对比关系便可进行施工过程的复合地基质量检测和控制。研究结果:文章就相对关系的建立和检测的程序、时间等都做了比较详细的说明,其中桩体比贯入阻力值的测试时间应先经室内试验,再经现场试验来确定,桩间土的比贯入阻力值则一般在成桩5~15 d内进行。原位测试方法速度快、费用低,可提高检测的频数,利于全面质量控制,且对桩的破坏很小。该方法目前已在郑西ZXZQ04标工艺试验中得到应用。研究结论:挤密桩复合地基原位测试检测方法简便、准确,符合现场实际情况,希望得到推广。

Procedure for Test and Inspection of Composite Subgrade Teated by Compaction Pile in Original Place

Research purposes: It required of selecting an effective method for testing and identifying result of subgrade treated by compaction pile.The test and inspection method in original place introduced in this paper is an inspection method carried out on site.Research methods:The test in original place is a static touch test carried out before consolidation of compaction pile.The relation is defined between specific injection resistance value of pile body and specific resistance value of soil among piles through contrast test of different solidified materials for pile body.The inspection and control of composite subgrade can be carried out during construction based on this contrast relation.Research results:It shows in details how to establish relative relation and how to define procedure and time of inspection in this paper.The test for specific injection resistance value of pile body should be first done indoor,then done on site for determination.The test for specific injection resistance value of soil among piles should be done in 5-15 days after piling.The test and inspection control and make less damage to pile body,with fast speed and low cost.This method bas been applied in engineering test for ZXZQ04 Bidding of Zhengzhou-Xi'an Passenger Dedicated Railway Line.Research conclusions:The test and inspection of composite subgrade treated by compaction pile in original place can meet needs of construction with easy operation and high accuracy and be applied widely.