一种地基土水平抗力系数的比例系数m的计算方法
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摘要
m值法是我国用于计算桩基水平承载力最广泛的方法,m值的取值直接影响桩侧土抗力的准确性,不同性质的土的m值的取值范围存在很大差别,m值的确定方法具有重要的工程应用价值。提出一种通过模型试验实测数据反算地基土m值的方法。基于扩底桩的横向加载模型试验,以云南省典型红黏土做为试验用地基土,先假定一个m值,计算桩在地面处的水平位移,将该值与室内模型试验实测的水平位移进行比较,若两者数值相差较大,则重新假定m值进行计算,直至计算出的位置值与实测值之间的误差在可接受范围之内,则所取的m值即为该级荷载下所对应的地基反力比例系数。结果表明,该方法可以获得较准确的地基土m值。
The m-value method is the most widely used method for calculating the horizontal bearing capacity of pile foundations. The accuracy of soil resistance of pile side is directly affected by m-value. The range of m-values of soils with different properties is very different. The method of determining the m-value has important engineering application value. A method for inversely calculating the m-value of foundation soil by model test data is proposed.Based on the lateral loading model test of the belled pile,the typical red clay in Yunnan Province was used as the test ground soil. The m-value was assumed first,and the horizontal displacement of the pile at the ground was calculated. The value was compared with the horizontal displacement measured by the indoor model test. For comparison,if the difference between the two values is large,the m-value is re-assumed until the calculated error between the calculated position value and the measured value is within the acceptable range,then the m-value is the proportion coefficient of ground reaction under this load. The results show that the accurate m-value of foundation soil can be obtained by this method.
The m-value method is the most widely used method for calculating the horizontal bearing capacity of pile foundations. The accuracy of soil resistance of pile side is directly affected by m-value. The range of m-values of soils with different properties is very different. The method of determining the m-value has important engineering application value. A method for inversely calculating the m-value of foundation soil by model test data is proposed.Based on the lateral loading model test of the belled pile,the typical red clay in Yunnan Province was used as the test ground soil. The m-value was assumed first,and the horizontal displacement of the pile at the ground was calculated. The value was compared with the horizontal displacement measured by the indoor model test. For comparison,if the difference between the two values is large,the m-value is re-assumed until the calculated error between the calculated position value and the measured value is within the acceptable range,then the m-value is the proportion coefficient of ground reaction under this load. The results show that the accurate m-value of foundation soil can be obtained by this method.
引文
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[2]廖景高.斜坡地基基桩水平抗力系数的比例系数m值取值研究[D].成都:成都理工大学,2014.LIAO Jinggao. Study on the Value of Proportional Coefficient m of Horizontal Resistance Coefficient of Foundation Pile in Slope Foundation[D].Chengdu:Chengdu University of Technology,2014.(in Chinese)
[3]朱令,丁文其,王瑞,等.考虑成层土变异性的等效基床系数分析[J].岩石力学与工程学报,2014,33(s1):3036-3040.ZHU Ling,DING Wenqi,WANG Duan,et al. Analysis of equivalent of subgrade reaction considering variability of layered soils[J]. Chinese Journal of Rock Mechanics and Engineering,2014,33(s1):3036-3040(in Chinese)
[4]张开伟,郅正华,李志勇.单桩水平静载试验各项测试参数分析[J].城市勘测,2016,(6):167-171.ZHANG Kaiwei,ZHI Zhenghua,LI Zhiyong. Analysis of static load test of single pile test parameters[J]. Urban Geotechnical Investigation&Surveying,2016,(6):167-171.(in Chinese)
[5]刘国彬,黄院雄,侯学渊.考虑时空效应的等效土体水平抗力系数的取值研究[J].土木工程学报,2001,34(3):97-102.LIU Guobin,HUANG Yuanxiong,HOU Xueyuan. Study on equivalent lateral resistance facror of soils in excavation[J]. China Civil Engineering Journal,2001,34(3):97-102.(in Chinese)
[6] GUO W D. Nonlinear response of laterally loaded piles and pile groups[J]. International Journal for Numerical and Analytical Methods in Geomechanics,2009,33(7):879-914.
[7]范秋雁,杨钦杰,朱真.泥质软岩地基水平抗力系数研究[J].岩土力学,2011,32(S2):137-142.FAN Qiuyan,YANG Qinjie,ZHU Zhen. Study of foundation horizontal resistance coefficient for argillaceous soft rocks[J]. Rock and Soil Mechanics,2011,32(S2):137-142(in Chinese)
[8]黄晓亮,岳建伟,李连东,等.组合桩地基土水平抗力系数的比例系数m的计算方法[J].岩土工程学报,2011,33(S2):192-196.HUANG Xiaoliang,YUE Jianwei,LI Liandong,et al. Calculation method for horizontal resistance coefficient of foundation soil with composite piles[J]. Chinese Journal of Geotechnical Engineering,2011,33(S2):192-196.(in Chinese)
[9]屈希峰.湿陷性黄土地基土m值分析[D],成都:西南交通大学,2007.QU Xifeng. M Value Analysis of Collapsible Loess Foundation Soil[D]. Chengdu:Southwest Jiaotong University,2007.(in Chinese)
[10] JGJ 94-2008建筑桩基技术规范[S].北京:中国建筑工业出版社,2008.JGJ 94-2008 Technical Code for Building Pile Foundation[S]. Beijing:China Architecture and Building Press,2008.(in Chinese)
[11]蔡亮,鲁子爱,韩洁.横向荷载群桩效应分析[J].水运工程,2003,(1):4-7.CAI Liang,LU Ziai,HAN Jie. Analysis of pile group effect under lateral load[J]. Marine Traffic Engineering,2003,(1):4-7.(in Chinese)
[12]胡人礼.桥梁桩基础分析和设计[M].北京:中国铁道出版社,1987.HU Renli. Analysis and Design of Bridge Pile Foundation[M]. Beijing:China Railway Press,1987.(in Chinese)
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