摘要
泥岩地基中的锤击打入桩,经常出现承载力异常问题,不能满足设计要求,需要补强处理,造成材料浪费和工期拖延,严重影响着工程建设。迄今为止尚未查清出现问题的原因,成为当前迫切需要解决的理论和技术难题。泥岩作为一种特殊的软岩,因其浸水易软化、受挤压易变形等特点,在荷载作用下易发生承载力不足的现象。归纳了现阶段泥岩地基锤击打入桩承载力不足的原因,明确了泥岩的基本工程性质,结合青岛地区泥岩桩的工程实例分析了泥岩中打入桩的工作机制和破坏模式,总结了动力打桩造成的泥岩损伤、泥岩桩的室内模型试验以及数值模拟等方面的研究进展,最后对泥岩地基动力打入桩的承载力问题进行了梳理,指出了目前研究存在的不足;同时,考虑到未来泥岩地区的发展及桩基工程的实际需求,针对泥岩的现场取样技术、泥岩桩的室内试验及数值模拟等方面提出了未来的发展方向。
Driven piles in mudstone foundation often have abnormal bearing capacity,which can not meet the design requirements and need reinforcement treatment,resulting in material waste and delay of construction period,and seriously affecting the project construction.So far,the causes of the problems have not been found out,which has become a theoretical and technical problem that urgently needs to be solved.As a special type of soft rock,mudstone is prone to lack of bearing capacity under the action of load due to its characteristics of softening easily in water and deformation easily under extrusion.The reasons of insufficient bearing capacity of hammer driven piles in mudstone foundation were summarized.The basic engineering properties of mudstone were clarified.Combined with the engineering example of mudstone pile in Qingdao area,the working mechanism and failure mode of driving mudstone pile were analyzed,and the research progress of mudstone damage caused by dynamic driving pile,laboratory model test and numerical simulation of mudstone pile were summarized.Finally,the bearing capacity of dynamic driven piles in mudstone foundation was sorted out and the shortcomings of current research were pointed out.At the same time,considering the future development of mudstone area and the actual demand of pile foundation engineering,the future development direction of mudstone sampling technology,laboratory test and numerical simulation of mudstone pile was put forward.
作者
张亚妹
孙淦
白晓宇
何来胜
张胜凯
于龙涛
许永亮
王希瑞
闫楠
ZHANG Ya-mei;SUN Gan;BAI Xiao-yu;HE Lai-sheng;ZHANG Sheng-kai;YU Long-tao;XU Yong-liang;WANG Xi-rui;YAN Nan(College of Civil Engineering,Qingdao University of Technology,Qingdao 266520,China;Shandong Provincial Colleges and Universities Blue Economic Zone Engineering Construction and Safety Collaborative Innovation Center,Qingdao University of Technology,Qingdao 266520,China;China Construction Fifth Engineering Bureau Co.,Ltd.,Changsha 410004,China;China Railway Construction Investment(Qingdao)Urban Development and Construction Co.,Ltd.,Qingdao 266031,China;China Railway Construction Group Co.,Ltd.,Beijing 100043,China)
出处
《科学技术与工程》
北大核心
2023年第1期13-25,共13页
Science Technology and Engineering
基金
山东省自然科学基金重点项目(ZR2020KE009)
国家自然科学基金(51778312)
中国博士后科学基金面上项目(2018M632641)。
关键词
动力打入桩
泥岩
承载力
损伤
数值模拟
driven pile
mudstone
the bearing capacity
damage
numerical simulation
