深层搅拌桩复合地基现场直剪试验方法探讨  

Research on the Methods of In-situ Direct Test of Rock in Deep Mixing Column Composite Foundation

作　　者：韩渊明 HAN Yuan-ming(Wuhan Surveying-Geotechnical Research Institute Co.,Ltd of MCC,Wuhan Hubei 430080)

机构地区：[1]中冶集团武汉勘察研究院有限公司,湖北武汉430080

出　　处：《中国科技纵横》2019年第11期134-136,共3页China Science & Technology Overview

摘　　要：在大型边坡和深厚基坑工程中,复合地基作为其支护结构常常出现。但现行规范对复合地基的现场直剪试验无明确规定,检测机构进行该项试验时无章可循,本文以深层搅拌桩为例,对该项试验方法进行探讨,基本保持岩土原来的结构、湿度和应力状态,对深层搅拌桩竖向增强体和桩间土进行试验,试样尺寸大,人为扰动也小于室内试验的样本,能更真实地反映复合地基的实际抗剪特性。Largescale slope and deep foundation pit often emerge in constructional engineering, so composite foundation as a supporting structure is usually applied in these projects. But current relative criterions didn't make a clear regulation for the in-situ direct test of rock in composite foundation ,so the testing agencies carried out this kind of experiment without code. This paper researched the methods of the in-situ direct test of rock with the example of deep mixing column composite foundation. Firstly, the original structure, moisture and stress state of the rock-soil are all maintained in the experiment. Subsequently the particular Vertical reinforcement of the deep mixing column and earth among piles were tested. The author found that the size of sample is big and man-made interference is less than laboratory test ,and concluded that this method can reflect the actual shear strength of composite foundation.

关 键 词：深层搅拌桩复合地基 竖向增强体 现场直剪试验 

分 类 号：TU753[建筑科学—建筑技术科学]