低应变法检测嵌岩灌注桩桩端性状的实例分析  

Example analysis of testing pile bottom status of rock-socketed cast-in-place used low-strain integrity test

作　　者：张雄水 

机构地区：[1]福建省建筑科学研究院,福建福州350025 [2]福建省绿色建筑技术重点实验室,福建福州350025

出　　处：《福建建筑》2015年第10期71-73,112,共4页Fujian Architecture & Construction

摘　　要：嵌岩灌注桩的桩端性状直接影响着桩的承载力的发挥。低应变法检测实例表明桩身截面变化,土阻力变化、混凝土强度变化、持力层破碎程度及沉渣厚度大小等因素都可能使低应变曲线上桩端的应力波反射复杂化。在综合对比同一场地、同一桩型的实测曲线后,对于桩端性状仍无法确定或有所怀疑时,可根据工程的实际情况选择合适的方法(如钻芯法等)进行核验,并进行综合评价,以避免误判、漏判。The bearing capacity of the rock-socketed cast-in-place pile is directly influenced by the pile bottom status. The examples show that the changes such as cross-section size,soil resistance,concrete strength and the crushing degree of bearing layer and pile bottom sediment thickness both make low-strain reflection wave of pile bottom complicated. Comparing the measured curves of low-strain integrity test with same pile type in the same site,when the pile bottom status of rock-socketed cast-in-place pile still not be determined or doubted,the appropriate method（ such as core drilling method,etc.） can be used to verify according to the actual situation and then the comprehensive evaluation will be given.

关 键 词：嵌岩灌注桩 桩端性状 低应变法 钻芯法 

分 类 号：TU473[建筑科学—结构工程]