强夯处理碎石回填土地基相关性试验研究
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摘要
在高填方地基强夯处理过程中检测与评价强夯质量是整个工程中非常重要的一部分。对某1 000 kV特高压变电站工程高填方碎石土回填强夯地基,从理论和实践的角度出发,研究瑞利波(RWT)、动力触探(DPT)和静载荷(PLT)各试验结果的相关性,表明瑞利波和动力触探试验结果可以验证静载荷试验结果。前两者可作为强夯地基检测的间接手段,适当减少费用昂贵、历时较长的静载荷试验,节省工程造价和加快工程进度。由试验结果拟合出各试验结果之间的数学表达式表明,剪切波速和地基承载力特征值近似服从幂函数相关,与变形模量和超重型动力触探击数近似服从指数函数相关,可推测出强夯地基有效加固深度和其他地基土力学参数。根据强夯有效加固深度实测结果,提出基于梅拉公式计算结果的修正系数在0.24~0.27之间,其结果可供类似工程的设计及施工参考。
The testing and evaluation about the quality of dynamic compaction is a very important part during high embankment foundation improvement.Based on the theory and practice,the correlation of the test results between Rayleigh wave test(RWT),dynamic penetration test(DPT) and pile static load test(PLT) were studied according to the 1 000 kV ultra-high voltage(UHV) substation.Showing that the results of RWT and DPT can verify the results of PLT,and the first two can be used as indirect means for dynamic compaction detection,which may be appropriate to reduce the assignments of PLT which costs so much and lasts so longer.According to the test results,the mathematical expression of the test results are fitted.Based on the results,the relationship of Vs and fk can be expressed by power function,and the relationship between Vs and E0 and N120 can be expressed by exponential function.And the effective reinforcement depth of dynamic compaction and other soil mechanical parameters are inferred.Based on the measured value of the effective reinforcement depth of dynamic compaction,the correction coefficient from 0.24 to 0.27 were putted forward according to Menard formula.The research results will provide certain reference value for the similar projects.
The testing and evaluation about the quality of dynamic compaction is a very important part during high embankment foundation improvement.Based on the theory and practice,the correlation of the test results between Rayleigh wave test(RWT),dynamic penetration test(DPT) and pile static load test(PLT) were studied according to the 1 000 kV ultra-high voltage(UHV) substation.Showing that the results of RWT and DPT can verify the results of PLT,and the first two can be used as indirect means for dynamic compaction detection,which may be appropriate to reduce the assignments of PLT which costs so much and lasts so longer.According to the test results,the mathematical expression of the test results are fitted.Based on the results,the relationship of Vs and fk can be expressed by power function,and the relationship between Vs and E0 and N120 can be expressed by exponential function.And the effective reinforcement depth of dynamic compaction and other soil mechanical parameters are inferred.Based on the measured value of the effective reinforcement depth of dynamic compaction,the correction coefficient from 0.24 to 0.27 were putted forward according to Menard formula.The research results will provide certain reference value for the similar projects.
引文
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[3]水伟厚,王铁宏,朱建峰.碎石回填地基土10 000kN·m高能级强夯标准贯入试验[J].岩土工程学报,2006,28(10):1309-1312.SHUI Wei-hou,WANG Tie-hong,ZHU Jian-feng.SPT research during 10 000 kN·m high energy dynamic compaction for foundation backfilled with crushedstone[J].Chinese Journal of Geotechnical Engineering,2006,28(10):1309-1312.
[4]王炜望,王仁刚,闫韶兵.动刚度和动力触探在强夯地基检测中的应用[J].岩土力学,2004,25(5):839-842.WANG Yi-wang,WANG Ren-gang,YAN Shao-bing.Application of dynamic rigidity and dynamic penetration to consolidated foundation test[J].Rock Soil Mechanics,2004,25(5):839-842.
[5]郭乃正,邹金峰,李亮,等.大颗粒红砂岩高填方路基强夯加固理论与试验研究[J].中南大学学报(自然科学版),2008,39(1):185-189.GUO Nai-zheng,ZOU Jin-feng,LI liang,et al.Dynamic compaction theory and experiments in high roadbed filled with red sandstone[J].Journal of Central South University of Technology(Science and Technology),2008,39(1):185-189.
[6]吴福良,耿光旭,仲伟周.瑞雷波在地基强夯检测中的应用[J].西安交通大学学报,2003,37(4):432-434.WU Fu-liang,GENG Guang-xu,ZHONG Wei-zhou.Rayleigh wave and its application to testing dynamiccompacted ground[J].Journal of Xi’an Jiaotong University,2003,37(4):432-434.
[7]丁伯阳.土层波速与地表脉动[M].兰州:兰州大学出版社,1996.
[8]PORAN C J,RODRIGUEZ J A.Design of dynamic compaction[J].Can.Geotech.J.,1992,29(5):796-802.
[9]刘海冲.关于强夯加固地基影响深度的研究[J].勘察科学技术,1993,11(3):19-22.LIU Hai-chong.A study of the influencing depth of dynamic consoljdation for foundation strengthening[J].Site Investigation Science and Technology,1993,11(3):19-22.
[10]SLOCOMBE B C.Dynamic compaction[M]//Ground Improvement.Canada:Canada CRC Press,1993:20-39.
[11]徐至钧.采用大夯击能强夯处理大块抛石地基[J].石油工程建设,1997,23(1):12-17.XU Zhi-jun.The application of large scale heavytamping treatment for the big throwing-ttones foundation[J].Petroleum Engineering Construction,1997,23(1):12-17.
[12]张峰.碎石土的强夯模型试验研究[J].建筑科学,1992,8(3):25-28.ZHANG Feng.A study on model tests of gravel by dynamic compaction[J].Building Science,1992,22(3):25-28.
[13]汪文善.强夯法商榷[C]//第四届全国土力学与基础工程学术讨论会论文集.北京:中国建筑工业出版社,1983.
[14]刘建达,宋文荣,许汉刚,等.瑞利波法在检验复合地基效果中的应用[J].地震学刊,1995,22(3):8-13.LIU Jian-da,SONG Wei-rong,XU Han-gang,et al.Application of Rayleigh wave method to effect test of complex foundation[J].Journal of Seismology,1995,22(3):8-13.
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