泥岩地基及嵌岩灌注桩的承载特性试验  

Test on Bearing Characteristics of Mudstone Foundation and Rock-socketed Pile

作　　者：张亚妹 秘金卫 白晓宇[1] 闫楠[1] 桑松魁 林振华 王波 陈吉光[3] 何来胜 ZHANG Ya-mei;BI Jin-wei;BAI Xiao-yu;YAN Nan;SANG Song-kui;LIN Zhen-hua;WANG Bo;CHEN Ji-guang;HE Lai-sheng(School of Civil Engineering,Qingdao University of Technology,Qingdao 266520,China;China Railway Construction Investment(Qingdao)Urban Development and Construction Co.,Ltd.,Qingdao 266031,China;The second Construction Limited Company of China Construction Eighth Engineering Division,Jinan 250014,China;China Construction Fifth Engineering Bureau Co.,Ltd.,Changsha 410004,China)

机构地区：[1]青岛理工大学土木工程学院,青岛266520 [2]中铁建投(青岛)城市开发建设有限公司,青岛266031 [3]中建八局第二建设有限公司,济南250014 [4]中国建筑第五工程局有限公司,长沙410004

出　　处：《科学技术与工程》2023年第2期722-730,共9页Science Technology and Engineering

基　　金：国家自然科学基金(51778312,51708316);山东省自然科学基金重点项目(ZR2020KE009);山东省博士后创新项目(201903043)。

摘　　要：红土崖组(KwH)泥岩是一种分布于青岛地区的白垩系王氏群泥岩,是一种非典型的黏土岩,其透水性弱,具有一定的膨胀特性。为研究泥岩的物理力学性质、变形特性及嵌入泥岩中灌注桩的承载特性,以红土崖组(KwH)泥岩为试验对象,在青岛某地区开展了泥岩常规物理力学试验、泥岩地基及泥岩地基中嵌岩灌注桩的静载荷试验。试验结果表明,红土崖组(KwH)泥岩含砂,吸水膨胀率较小,是一种非膨胀性岩;全风化及强风化泥岩地基的P-s曲线基本呈缓变型;而中风化泥岩地基在破坏时发生了压裂及隆起,P-s曲线呈陡降型,而且变异性较大。该场地泥岩地基中灌注桩分别加载至10800、12960 kN,试桩均未发生破坏,嵌岩灌注桩的桩侧摩阻力和桩端阻力均未充分发挥;中风化泥岩的承载力较高,可作为桩基理想的持力层。研究成果对青岛地区泥岩地基中的工程建设具有参考价值。KwH mudstone is a kind of cretaceous Wang group mudstone distributed in Qingdao area.It is a kind of atypical clay rock with weak permeability and certain swelling characteristics.In order to study the physical and mechanical properties of mudstone,deformation characteristics and bearing characteristics of embedded piles in mudstone,conventional physical and mechanical tests on mudstone,static load tests on mudstone foundation and embedded piles in mudstone foundation were carried out in an area of Qingdao using the mudstone of the KwH as the test object.The results show that the mudstone of KwH contains sand and has small water absorption and expansion rate,which is a non-expansive rock.The P-s curve of mudstone foundation with full weathering and strong weathering basically shows a slow variation type.However,fracturing and uplift occurred during the failure of the moderately weathered mudstone foundation,and the P-s curve showed a steep drop and great variability.In the mudstone foundation of the site,the embedded piles are respectively loaded to 10800 kN and 12960 kN,and the test piles are not damage,and the side friction resistance and end resistance of rock-socketed piles are not fully exerted.The moderately weathered mudstone has a high bearing capacity and can be used as an ideal bearing layer of pile foundation.The research results have reference value for the engineering construction of mudstone foundation in Qingdao area.

关 键 词：泥岩 泥岩地基 嵌岩桩 静载试验 承载特性 损伤 

分 类 号：TU473.11[建筑科学—结构工程]