摘要
为提高深厚软土路基水泥搅拌桩加固效果,选择氯化钙、氢氧化铝、生石膏和二乙醇单异丙醇胺(DEIPA)等外加剂进行室内试验研究。无侧限抗压强度试验表明,DEIPA外加剂对水泥土强度提高的效果最优,最优掺入比为0.04%。同时,通过现场取芯试验、静载荷试验验证其应用效果。现场试验结果表明,钉形水泥搅拌桩的桩身强度沿深度分布不太均匀。静载荷试验中荷载-沉降曲线呈缓变型,桩顶沉降较小,桩土未出现明显破坏,回弹率均在40%以上。说明含DEIPA外加剂的钉形水泥搅拌桩桩身质量较好,承载力和强度满足设计要求。研究成果可为相似工程提供借鉴。
In order to improve the reinforcement effect of cement piles applied on deep soft soil roadbeds,additive such as calcium chloride,aluminum hydroxide,raw gypsum,and diethanol monoisopropanolamine(DEIPA)were selected for laboratory test.Unconfined compressive strength test shows that the DEIPA additive has the best effect on improving the strength of cement soil and that the optimal blending ratio is 0.04%.At the same time,its application effect was verified by core drilling test and static load test.The field test results show that the strength along the T-shaped deep mixing pile is nonunifbrm.The load-settling curve is slowly changed,the pile top settlement is small,the pile-soil surface has no obvious damage,and the rebound rate is greater than 40%.It shows that the composite cement mixing pile with DEIPA additive has good quality and its bearing capacity and strength meet design requirements.The research results can provide reference for similar projects.
作者
董武俊
DONG Wujun(China Railway 11 Bureau Group CO.LTD,Wuhan 430061,China)
出处
《地基处理》
2020年第1期65-70,共6页
Journal of Ground Improvement
