基于钻芯法的水泥土搅拌桩桩身强度分析  

Pile Strength Analysis of Cement-Soil Mixing Pile Based on Core Drilling Method

作　　者：李育海 LI Yuhai(China Railway 15th Bureau Group Co.Ltd.,Luoyang Henan 471013,China)

机构地区：[1]中铁十五集团有限公司,河南洛阳471013

出　　处：《铁道建筑技术》2024年第10期193-196,共4页Railway Construction Technology

基　　金：中铁十五局集团有限公司科技研发计划(2023C83)。

摘　　要：钻芯法是评估水泥土搅拌桩桩身强度的重要手段。基于某公路地基处理工程,阐述钻芯法在水泥搅拌桩质量检测中涉及到的仪器设备和检测技术要点,提出芯样抗压强度计算方法,并开展水泥土搅拌桩钻芯法取样工作,对桩身强度进行单轴无侧限抗压强度试验,分析试验曲线特征。研究结果表明:试验桩桩身强度标准值为1.76 MPa,强度代表值介于1.31~2.77 MPa之间,满足强度设计要求;搅拌桩抗压强度沿深度方向呈现自上而下递减趋势,即存在一个荷载传递的“有效桩长”,当桩长超此界限,继续增加桩长对承载力提升无显著效果。The core drilling method is an important means to evaluate the strength of cement-soil mixing piles.Based on a highway foundation treatment project,this paper briefly describes the key points of instruments and equipment and testing technology involved in the quality testing of cement mixing piles by core drilling method,proposes the calculation method of compressive strength of core samples,carries out the sampling work of core drilling method of cement-soil mixing piles,conducts uniaxial unconfined compressive strength test on the strength of the pile,and analyzes the characteristics of the test curve.The results show that the standard value of the pile strength is 1.76 MPa,and the representative value of the strength is between 1.31~2.77 MPa,which meets the strength design requirements,and the compressive strength of the mixing pile shows a top-down decreasing trend along the depth direction,that is,there is an“effective pile length”for load transfer.When the pile length exceeds this limit,continuing to increase the pile length has no significant effect on the improvement of bearing capacity.

关 键 词：水泥土搅拌桩 钻芯法 芯样强度 桩身强度 

分 类 号：TU473.1[建筑科学—结构工程] U416.1[建筑科学—土工工程]