增强体复合土动弹性模量影响因素的研究
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摘要
通过水泥土、灰土、水泥砂浆3种增强体复合试样以及纯粉土试样的动三轴试验,研究了不同增强体对土体动弹性模量的影响,讨论了围压、置换率的影响程度。研究发现:增强体的设置使得土体的动弹性模量Ed及最大动弹性模量Edmax显著提高,复合试样的Ed和Edmax均随增强体刚度、置换率及围压的增大而增大。在各影响因素中,对水泥砂浆复合试样而言增强体设置对Edmax的提高程度最大;置换率增加对Edmax的提高程度随围压的增加而降低,且置换率对水泥土增强体复合土的影响最大,对水泥砂浆增强体复合土的影响最小;围压的增加对Edmax的提高程度随置换率的增加而减小,低置换率下围压的影响随增强体刚度不同而不同,随着置换率的提高围压对不同增强体复合土的影响逐渐趋于一致。文中同时给出不同增强体、置换率及围压对复合试样Edmax的影响规律表达式及各提高系数的回归公式。
The effect of composite soil with different reinforcement,including the cement-soil,lime-soil and cement mortar,on dynamic elastic modulus of soil was experimentally studied by dynamic tri-axial test.It is found that the reinforcement remarkably elevate the soil dynamic elastic modulus E_d and maximum dynamic elastic modulus E_(dmax),and these moduli increase following the increase of stiffness of reinforcement,replacement ratio and confining pressure.Among these three kinds of reinforcement to be study,the effect of cement mortar reinforcement on elevating E_(dmax) is the most.The effect of replacement increase on E_(dmax) decreases as the confining pressure increases.The replacement ratio has the greatest effect upon the composite silt with cement-soil reinforcement but the smallest effect upon those with cement mortar reinforcement.The effect of confining prossure decreases as replacement ratio increases,and it varies by different reinforcement at lower replacement ratio. However,following the increase of replacement ratio the influence of confining pressure on different reinforced composite soils tends to a same level.The formulas of E_(dmax) for different kinds of reinforcement with replacement ratio and confining pressure taken into account are given.
The effect of composite soil with different reinforcement,including the cement-soil,lime-soil and cement mortar,on dynamic elastic modulus of soil was experimentally studied by dynamic tri-axial test.It is found that the reinforcement remarkably elevate the soil dynamic elastic modulus E_d and maximum dynamic elastic modulus E_(dmax),and these moduli increase following the increase of stiffness of reinforcement,replacement ratio and confining pressure.Among these three kinds of reinforcement to be study,the effect of cement mortar reinforcement on elevating E_(dmax) is the most.The effect of replacement increase on E_(dmax) decreases as the confining pressure increases.The replacement ratio has the greatest effect upon the composite silt with cement-soil reinforcement but the smallest effect upon those with cement mortar reinforcement.The effect of confining prossure decreases as replacement ratio increases,and it varies by different reinforcement at lower replacement ratio. However,following the increase of replacement ratio the influence of confining pressure on different reinforced composite soils tends to a same level.The formulas of E_(dmax) for different kinds of reinforcement with replacement ratio and confining pressure taken into account are given.
引文
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[2]杨广庆.水泥改良土的动力特性试验研究[J].岩石力学与工程学报,2003,22(7):1156-1160.
[3]侯永峰,张航,周建,等.循环荷载作用下水泥复合土变形性状试验研究[J].岩土工程学报,2001,23(3):288-291.
[4]蔡袁强,梁旭,李坤.水泥土-土复合试样的动力特性[J].水利学报,2003(10):19-25.
[5]白顺果,侯永峰,张鸿儒.循环荷载作用下水泥土复合地基的临界循环应力比和永久变形分析[J].岩土工程学报,2006,28(1):84-87.
[6]刘松玉,钱国超,章定文.粉喷桩复合地基理论与工程应用[M].北京:中国建筑工业出版社,2006.
[7]GB/T50123-1999,土工试验方法标准[S].
[8]Hardin B O,Drnevich V P.Shear modulus and damping ratio in soil:Design equations and curves[J].Journal of the SoilMechanics and Foundations Engineering Division,American Society of Civil Engineering,1972,98(7):667-691.
[9]谢定义.土动力学[M].西安:西安交通大学出版社,1988.
[10]何昌荣.动模量和阻尼的动三轴试验研究[J].岩土工程学报,1997,19(2):39-48.
[11]贺建清,阳军生,靳明.循环荷载作用下掺土煤矸石力学性状试验研究[J].岩石力学与工程学报,2008,27(1):199-20.
[12]袁晓铭,孙锐,孙静,等.常规土类动剪切模量比和阻尼比试验研究[J].地震工程与工程振动,2000,20(4):133-139.
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