施工技术2016年1月上 52CONSTRUCTIONTECHNOLOGY第45卷第1期 DOI:10. 7672/sgjs2016010052 强夯加固填土地基静载荷试验的尺寸效应研究*
张小龙',李颖² (1.同济大学岩土及地下工程教育部重点实验室,上海200092;2.上海同砚建筑规划设计有限公司,上海200092) [摘要】对强夯加固填土厚度为10m的碎石土进行现场静载荷试验,在压板宽度选择时,考虑了相关规范所要求的 最小值和承压板应力所能达到的影响深度的因素,选用宽度为1.41,3.00,3.46,4.47m4种规格正方形大面积压板 进行现场静载荷试验,研究压板宽度对地基沉降、相对沉降比、土性参数、地基承载力的影响,得到了上述研究对象 随着压板宽度的变化规律,并且给出了强夯填土地基静载荷试验压板宽度选取的范围。
[关键词]地基;强夯;静载荷;试验;尺寸效应 [中图分类号]TU472[文献标识码]A[文章编号〕1002-8498(2016)01-0052-04 TheResearchonSizeEffectofStaticLoadTestofDynamicCompacting ThickFilledEarthFoundation ZhangXiaolong',Li Ying² (1.Key Laboratory of Geotechnicaland Underground EngineeringofMinistry of Education,TongjiUniversity, Shanghai 200092,China;2. Shanghai Tongyan Architectural and Planning Design Co.,Ld.,Shanghai 200092, China) Abstract:Choosing the width of bearing plate to do field static load test with gravelly soil with thickness of 10m of filled earth reinforced by dynamic paction, this paper considered both the minimum value required by the relevant standard and the depth-influencing factors produced by bearing plates after being stressed and then chose 4 norms of large square bearing plates with the width of 1.41m, 3. 00m,3.46m and 4.47m to do the field static load test to study the effects of width of bearing plates to foundation settlement,relative settlement proportion,soil parameters,ultimate bearing capacity of ground and bearing capacity of ground.Summing up the results helps gain the rule of the objects mentioned above varyingwith the width ofbearing plates and shows the width choosing range of bearing platesto do static load test of dynamic pacting the filled earth foundation. Key words:;foundations;dynamic paction;static load;test;size effect 0引言尺寸效应对地基检测结果的影响。
关于强夯加固效果的检测方法有多种,目前静关于承压板的尺寸效应,国内外学者均有研 载荷试验是一种重要的模拟基础受力变形的原位究。
DeBeer在砂层上研究承压板尺寸与沉降关系, 测试方法,《建筑地基基础设计规范》GB50007一发现沉降的增大或减小与压板尺寸的大小有关2; 2011中规定强夯地基的处理效果应采用载荷试验。
冶金部勘察系统在太原黄土地区进行承压板与沉 至于采用何种尺寸的承压板,规定强夯地基压板面降关系的研究,得到了与文献[2]相似的结论”;辛 积应按处理深度确定并考虑压板的尺寸效应,应采静明在天...