数控简单剪切仪动态土壤测试(含外文处处)

中文译文标题:
数控简单剪切仪动态土壤测试(含外文处处)(中文4800字,英文2900字)
作者:
果皮,Pendo M,辉西
斯图尔特,乔纳森•P,加州大学洛杉矶分校
Venugopal,拉维,Sysendes公司。
出版日期:
01-01-2007
系列:
加州大学洛杉矶先前发表的作品
发布信息:
加州大学洛杉矶先前发表的作品,加州大学洛杉矶
附加信息:
版权2007年,ASTM,http://journalsip.astm.org/
原始引用:
果皮,斯图尔特,摩根,d.h。,Venugopal,r .(2007)。“数控简单剪切设备动态土壤测试”,Geotech。测试日报,ASTM,30(5),368 - 377。
数控剪切装置简单动态土壤测试
文摘:我们描述的特征简单剪切装置能力运用现实的多向地震荷载对土
标本。这个装置,文中称为数控简单剪切(直流ss)装置,包括功能,如伺服液压控制的驱动和真正的数字控制克服控制的局限性,一些之前的动态土壤测试机器。该设备是显示有能力正弦和宽带的复制命令信号在一个广泛的频率和振幅,虽然设备有限控制能力非常小的命令位移(少于大约0.005毫米)。小变形限制结果从噪声介绍了控制系统的反馈信号的模数转换。我们证明,双向命令信号准确地传授与最小交叉耦合,结果从一个创新的多输入多输出的数字控制系统。这个功能的设备演示一系列宽带测试标本非饱和土受到uni -和双向励磁。
关键词:数字控制,简单的剪切、动态土壤测试、多向加载
介绍
直接简单的剪切设备已经成功运用多年来描述静态和动态土属性。这测试方法往往是首选当它是可取的标本来体验光滑、连续的旋转主应力方向在剪切。初始应力可以应用模拟静态字段条件当钢丝增强利用膜,减少横向变形样品(即。,NGI-type配置,Bjerrum和Landva1966)。也许最常见的应用程序的简单剪切试验对仿真的垂直(或近垂直)剪切波传播通过土柱。优点和局限性简单的剪切测试相对于其他类型的实验室测试描述了在其他地方,这里不再重复(比如,菜的et al。1972;沈et al。1978;萨达et al。1982;Vucetic和拉卡斯提花1982;1985;Budhu Bhatia et al。1985;Amer et al。1987;Airey和木材1987;Budhu和Britto 1987;雅et al。1993)。

英文原文
Title:
Digitally controlled simple shear apparatus for dynamic soil testing
Author:
Duku, Pendo M, Fugro West
Stewart, Jonathan P, University of California, Los Angeles
Venugopal, Ravi, Sysendes, Inc.
Publication Date:
01-01-2007
Series:
UC Los Angeles Previously Published Works
Publication Info:
UC Los Angeles Previously Published Works, UC Los Angeles
Additional Info:
Copyright 2007, ASTM, http://journalsip.astm.org/
Original Citation:
Duku, P.M., Stewart, J.P., Whang, D.H., Venugopal, R. (2007). “Digitally controlled simple shear
apparatus for dynamic soil testing,” Geotech. Testing Journal, ASTM, 30 (5), 368-377.

Digitally Controlled Simple Shear Apparatus for
Dynamic Soil Testing
ABSTRACT:We describe the characteristics of a simple shear apparatus capable of applying realistic multidirectional earthquake loading to soil
specimens. This device, herein termed the Digitally Controlled Simple Shear (DC-SS) apparatus, incorporates features such as servohydraulic
actuation and true digital control to overcome control limitations of some previous dynamic soil testing machines. The device is shown to be capable
of reproducing sinusoidal and broadband command signals across a wide range of frequencies and amplitudes, although the device has limited
control capabilities for very small command displacements (less than approximately 0.005 mm). The small deformation limitation results from noise
introduced to the control system from analog-to-digital conversion of feedback signals.We demonstrate that bidirectional command signals can be
accurately imparted with minimal cross coupling, which results from an innovative multiple-input, multiple-output digital control system. The
capabilities of the device are demonstrated with a series of broadband tests on unsaturated soil specimens subjected to uni- and bidirectional excitation.
KEYWORDS: digital control, simple shear, dynamic soil testing, multidirectional loading

Introduction
    Direct simple shear apparatuses have been utilized successfully formany years to characterize static and dynamic soil properties. Thismethod of testing is often preferred when it is desirable for thespecimen to experience a smooth and continuous rotation of theprincipal stress directions during shear. Initial stresses can be applied to simulate at-rest field conditions when wire reinforcedmembranes are utilized that minimize lateral distortion of thesample (i.e., the NGI-type configuration, Bjerrum and Landva1966). Perhaps the most common application of simple shear testing has been for the simulation of vertical (or nearly vertical) shearwave propagation through a soil column. Advantages and limitations of simple shear tests relative to other types of laboratory tests have been described elsewhere and are not repeated here (e.g.,
Lucks et al. 1972; Shen et al. 1978; Saada et al. 1982; Vucetic and Lacasse 1982; Budhu 1985; Bhatia et al. 1985; Amer et al. 1987; Airey and Wood 1987; Budhu and Britto 1987; Boulanger et al. 1993).