钻孔内径向挤扩土压力的岩土勘察原位测试方法  

In-situ Test Method of Radial Extrusion Earth Pressure in Borehole for Geotechnical Investigation

作　　者：何伟兵 蒲春平 张国梁 HE Weibing;PU Chunping;ZHANG Guoliang(Guangdong Province Communications Planning&Design Institute Co.,Ltd.,Guangzhou 510507;Guangdong Road and Bridge Construction Development Co.,Ltd.,Guangzhou 510635;Beijing Zhipandi Engineering Science and Technology Development Center,Beijing 100143)

机构地区：[1]广东省交通规划设计研究院集团股份有限公司,广东广州510507 [2]广东省路桥建设发展有限公司,广东广州510635 [3]北京支盘地工科技开发中心,北京100143

出　　处：《广东交通职业技术学院学报》2024年第4期8-12,68,共6页Journal of Guangdong Communication Polytechnic

摘　　要：挤扩支盘桩自20世纪80年代末面世以来,在提高桩基承载力、减少沉降、提高桩基安全度、降低工程造价等方面都起到了重要作用。挤扩压力值是确定支盘数量、位置、间距的关键指标,直接决定了挤扩支盘桩基桩承载力。目前,挤扩压力值是在挤扩支盘桩施工时进行实时采集,无法在设计阶段获取。本文提出将挤扩机进行小型化改造,使其能放入钻孔内进行挤扩作业,通过钻孔内侧向挤扩土体获得挤扩压力值,既能用于挤扩支盘桩设计,也能分析研究岩土层的承载力等力学指标。本方法作为一种新型的常规岩土工程勘察原位测试方法,具有重要的研究意义和广阔的应用前景。Since the introduction of squeezed branch pile in the late 1980s,it has played an important role in improving the bearing capacity of pile foundation,reducing settlement,improving the safety of pile foundation and reducing project cost.The extrusion pressure value is the key index to determine the number,position and spacing of the squeezed branch,which directly determines the bearing capacity of the squeezed branch pile foundation.At present,the squeezing pressure value is collected in real time during the construction of squeezed branch pile,which cannot be obtained in the design stage.In this paper,it is proposed to carry out the miniaturization transformation of the extruder,which can be put into the borehole to carry out the extrusion operation,and obtain the extrusion pressure value through the inner side of the borehole to the soil.It can not only be used for the design of the squeezed branch pile,but also analyze and study the mechanical indexes such as the bearing capacity of the rock and soil layer.As a new type of in-situ test method for conventional geotechnical engineering investigation,the research is of great significance and has broad application prospects.

关 键 词：挤扩支盘桩 挤扩机 挤扩压力值 钻孔 原位测试 

分 类 号：TU413.9[建筑科学—岩土工程]