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Biot's dynamic consolidation equations and Hankel transform were used to derive the integral solutions of stress and displacement for axisymmetric harmonic excitations in the two-phase saturated soil with subjacent rock-stratum. The influence of the coefficient of permeability and loading frequency on the soil displacement at the ground surface were studied. The results showed that higher loading frequency led to more dynamic characteristics; and that the effect of the soil permeability was more obvious at higher frequencies. 相似文献
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Stable response of axisymmetric two-phase water-saturated soil 总被引：1，自引：0，他引：1
Biot's dynamic consolidation equations and Hankel transform were used to derive the integral solutions of stress and displacement for axisymmetric harmonic excitations in the two-phase saturated soil with subjacent rock-stratum. The influence of the coefficient of permeability and loading frequency on the soil displacement at the ground surface were studied. The results showed that higher loading frequency led to more dynamic characteristics; and that the effect of the soil permeability was more obvious at higher frequencies. 相似文献
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INTRODUCTION The dynamic response of foundations resting onthe surface of a half space is of significant importancein soil-foundation interactions and machine founda-tion designs. Observation of earthquake damage in-dicated that the local soil properties, foundation ge-ometries, etc., play a central role in the dynamic be-havior of the soil-foundation system. Ever-increasing research has been devoted to theproblem of an elastic half space indented by a rigidfooting by employi… 相似文献
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In this paper, the steady-state response of a saturated half-space with an overlying dry layer subjected to a moving rectangular
load is investigated. The governing partial differential equations are solved using the Fourier transform. The solutions in
time-space domain are expressed in terms of infinite Fourier type integrals, which can be evaluated only by numerical quadrature.
Numerical results show that the influence of a drained or undrained interface on the response is related to the permeability
of the underlying saturated soil. Moreover, the effect due to the upper dry layer is associated with the thickness of the
layer. 相似文献
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林智勇 《福建工程学院学报》2016,(4):318-323
利用数值分析方法建立了软土地基模型,采用比奥固结理论,计算分析了真空预压下的软土地基流固耦合作用;并进一步分析了真空度损耗率、密封墙、塑料排水板打设深度等因素对软基加固效果的影响。分析结果表明:在抽真空早期,地表沉降增长很快,达到一定天数后,沉降值逐渐趋于稳定;真空负压沿深度、水平方向上损耗,在加固软土外围形成一个零孔隙水压力面;真空度损耗率、塑料排水板打设深度对真空预压加固软土的效果影响很大;侧向密封墙对加固区内土体影响不大,但其限制了真空负压的侧向传递,使影响区的地基沉降大幅减小。 相似文献
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Wan-huan Zhou Ren-peng Chen Lin-shuang Zhao Zheng-zhong Xu Yun-min Chen 《浙江大学学报(A卷英文版)》2012,13(11):888-894
In this paper, a semi-analytical method for the analysis of pile-supported embankments is proposed. The mathematic model describes the cooperative behavior of pile, pile cap, foundation soil, and embankment fills. Based on Terzaghi??s 1D consolidation theory of saturated soil, the consolidation of foundation soil is calculated. The embankments with two different types of piles: floating piles and end-bearing piles are investigated and discussed. The results of axial force and skin friction distributions along the pile and the settlements of pile-supported embankments are presented. It is found that it takes a longer time for soil consolidation in the embankment with floating piles, compared with the case using end-bearing piles. The differential settlement between the pile and surrounding soil at the pile top is larger for the embankment with end-bearing piles, compared with the case of floating piles. 相似文献
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黄建华 《福建工程学院学报》2012,(3):222-229
针对海积饱和软土地基处理实际工程中采用搅拌桩复合地基和堆载预压排水固结两种方法,进行技术与经济的优化设计分析,预测饱和软土固结度及其沉降特征。通过工程现场监测数据和实际应用效果进行对比,验证理论分析成果和固结度计算以及沉降预测的有效性,结果表明,堆载预压和排水系统的有效结合,对处理沿海饱和软土地基具有良好效果,且经济有效。 相似文献
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Influence of water saturation on propagation of elastic waves in transversely isotropic nearly saturated soil 总被引：1，自引：0，他引：1
INTRODUCTIONIthaslongbeenrecognizedthatcompression alwavespropagationinsaturatedsoilsisstronglyaffectedbythewaterfillingtheintersticesofthesoilgrains.HardinandRichart(1 963 )appliedthetwo phasetheoryofBiot(1 956)andstudiedtheinfluenceoftheconfiningpressur… 相似文献
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Based on consolidation equations proposed for unsaturated soil, an analytical solution for 1D consolidation of an unsaturated single-layer soil with nonhomogeneous mixed boundary condition is developed. The mixed boundary condition can be used for special applications, such as tests occur in laboratory. The analytical solution is obtained by assuming all material parameters remain constant during consolidation. In the derivation of the analytical solution, the nonhomogeneous boundary condition is first transformed into a homogeneous boundary condition. Then, the eigenfunction and eigenvalue are derived according to the consolidation equations and the new boundary condition. Finally, using the method of undetermined coefficients and the orthogonal relation of the eigenfunction, the analytical solution for the new boundary condition is obtained. The present method is applicable to various types of boundary conditions. Several numerical examples are provided to investigate the consolidation behavior of an unsaturated single-layer soil with mixed boundary condition. 相似文献
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Transient response of a spherical cavity with a partially sealed shell embedded in viscoelastic saturated soil 总被引：1，自引：0，他引：1
INTRODUCTION The propagation of stress-waves in an elasticmedium containing a cavity that are due to arbitrarydynamic loading applied on the cavity is of greatimportance in the fields of seismology, geophysicalprospecting, underground tunnels and deeply buriedpipelines, particularly as a model of an earthquakesource. Ben-Menahem and Cisternas (1963) devel-oped the theory for the dynamic response of an elastichalf-space medium to an explosion spherical cavity.Norwood and Miklowitz (… 相似文献
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ＩＮＴＲＯＤＵＣＴＩＯＮＩｎｃｏｌｄｒｅｇｉｏｎｓ,ｓｏｉｌｅｘｐａｎｓｉｏｎｒｅｓｕｌｔｅｄｆｒｏｍａｓｏｉｌｆｒｅｅｚｉｎｇｐｒｏｃｅｓｓｏｆｔｅｎｄｅｆｏｒｍｓａｎｄｄａｍａｇｅｓｓｏｍｅｃｏｎｓｔｒｕｃｔｉｏｎｆｏｕｎｄａｔｉｏｎｓ.Ｏｎｅｗａｙｔｏｓｔａｂｉｌｉｚｅｔｈｅｆｏｕｎｄａｔｉｏｎｉｓｕｓｅｏｆｔｗｏｐｈａｓｅｃｌｏｓｅｄｔｈｅｒｍｏｓｙｐｈｏｎｉｎｔｈｅｃｏｌｄｒｅｇｉｏｎｓ.Ｄｕｅｔｏｉｔｓｅｘｃｅｌｌｅｎｔｈｅａｔｔｒａｎｓｆｅｒｃｈａｒａｃｔｅｒｉｓｔｉｃｓ,ｔｈｅｔｗｏ… 相似文献
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Biot's two-phase theory for fluid-saturated porous media was applied in a study carried out to investigate the influence of water saturation on propagation of elastic wave in transversely isotropic nearly saturated soil. The characteristic equations for wave propagation were derived and solved analytically. The results showed that there are four waves: the first and second quasi-longitudinal waves (QP1 and QP2), the quasi-transverse wave (QSV) and the anti-plane transverse wave (SH). Numerical results are given to illustrate the influence of saturation on the velocity, dispersion and attenuation of the four body waves. Some typical numerical results are discussed and plotted. The results can be meaningful for soil dynamics and earthquake engineering. 相似文献
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在考虑软土超载预压后的次固结变形特性的基础上,推导出消除使用荷载作用下的主固结所需预压时间的公式.通过室内试验研究了不同超载量和不同超载预压时间对饱和软土次固结变形的影响,对排水固结法处理软土地基有一定的参考价值. 相似文献
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硬盘系统一般采用气体润滑，以提高使用寿命和读写可靠性．本文讨论了多聚脂流体润滑的ＩＢＭ３３７０ 磁头／ 磁盘系统，以期提高磁记录密度．润滑模型中考虑了超薄流体润滑的剪薄效应，并用有限差分法对润滑方程进行求解．应用摄动理论建立了ＩＢＭ３３７０ 磁头／ 磁盘系统的动力学模型，分别对气体润滑和液体润滑的两自由度磁头的动力响应进行了仿真．仿真结果表明，在相同磁头倾角条件下，液膜润滑的磁头／ 磁盘的动力稳定性优于气体润滑的磁头／ 磁盘系统 相似文献
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时间分数阶偏微分方程的基本解 总被引：1，自引：0，他引：1
利用傅立叶变换和拉普拉斯变换推导出空间全平面内的时间分数阶偏微分方程的基本解(格林函数)。此基本解的表达式可通过适当的变形求出。该方法也可用于求解相应的整数阶偏微分方程基本解。 相似文献
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SH波在正交各向异性功能梯度材料直裂纹处的散射 总被引：2，自引：0，他引：2
研究了正交各向异性功能梯度材料中直裂纹对SH波的散射问题,材料两个方向的剪切模量和密度假定为指数模型,通过积分变换-积分方程方法,建立数学模型,化为对偶积分方程,用Copson方法求解对偶积分方程,最后得到动应力强度因子,并且给出了数值算例,讨论了在SH波作用下,裂纹尖端的动应力强度因子与入射波的频率,入射角的关系． 相似文献
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针对沉降计算的可靠性与方便性,提出了一种考虑三向变形的实用沉降计算方法。通过分析Skempton-Bjerrum沉降计算方法的不足,引入土体发生固结沉降时的三向变形效应,采用弹性力学理论,得出了考虑三向变形的沉降计算实用式。并用工程实例分析验证了该方法的可靠性。 相似文献
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An array of rigid piles used as a screening barrier for plane shear （S） waves is investigated in a homogeneous unbounded space. The dynamic poroelastic theory of Biot is employed, under the assumption of an incompressible solid grain. Using Fourier-Bessel series, the problem of multiple scattering is solved by imposing continuity conditions and equilibrium conditions at the soil-pile interfaces with the translational addition theorem. A parametric analysis is conducted to investigate the influence of the permeability of poroelastic soil, separation between piles, number of piles and frequency of incident waves on screening effectiveness of the barrier, and the results are compared with those in an elastic soil medium. Computed results show that the intrinsic permeability of the soil medium displays an apparent effect on the screening of plane S waves. 相似文献