摘要
水泥搅拌桩是软土地基加固常用的方法,桩体检测是其中的质量控制环节,现行规范以抽芯检测作为指定方法。针对抽芯检测法周期长、造价高、效率低的问题,通过现场及室内实验进行了水泥搅拌桩质量快速检测方法的研究。研究表明,预置管法静力触探可以实现对水泥搅拌桩体连续检测的目标;不同土层7 d龄期的静力触探锥尖阻力与芯样28 d强度具有良好的线性相关性,线性参数随土体中黏粒含量的提高而减小;试桩阶段采用锥尖阻力联合钻孔芯样抗压强度制定静力触探法检测标准曲线,形成施工阶段水泥搅拌桩的快速检测标准,达到缩短检测工期,提高检测速度,降低检测造价,提高检测结果可靠性的目标。
The method of cement mixing pile（CMP） is often used to improve soft soil foundation.CMP quality detection is important to evaluate the effect of foundation improvement.As the specified method for the current code of China government,coring has the shortages of long cycle,high cost and low efficiency.The method of quick quality detection is studied though field and laboratory tests.The results show that the method of static cone penetration tests in the reserved hole can detect the quality of CMP continuously.The tip resistance in the 7th day has good linear relationship with the unconfined compressive strength in the 28th day.The linear parameters decrease with the increase of clay particles content.The tip resistance of static cone penetration combining with the unconfined compressive strength of core samples makes the standard curve and forms the rapid detection methods for CMP.The proposed method can shorten the time,accelerate the speed,reduce the cost and improve the reliability of the test results.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2013年第7期1289-1296,共8页
Chinese Journal of Geotechnical Engineering
基金
江苏省自然科学基金项目(BK2011747)
广东省交通厅科技项目(201102017)
关键词
搅拌桩
预置导管
静力触探
取芯
cement mixing pile
reserved pile
static cone penetration
coring
作者简介
李国维（1964-），男，黑龙江大庆人，博士，副研究员，主要从事软基路堤变形、高边坡稳定的研究工作。E—mail：lgwnj@163．com。
