Multidirectional Vibroseis Shaking and Controlled Blasting to Determine the Dynamic In Situ Response of a Low-Plasticity Silt Deposit
Multidirectional Vibroseis Shaking and Controlled Blasting to Determine the Dynamic In Situ Response of a Low-Plasticity Silt Deposit
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DOI：
10.1061/(asce)gt.1943-5606.0002924
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发表时间：
2023-03
影响因子：
3.9
通讯作者：
A. Jana;A. Dadashiserej;Benchen Zhang;A. Stuedlein;T. Matthew Evans;K. Stokoe;B. Cox
中科院分区：
文献类型：
--
作者：
A. Jana;A. Dadashiserej;Benchen Zhang;A. Stuedlein;T. Matthew Evans;K. Stokoe;B. Cox
在本文中，全尺寸的现场三维（3D）的低塑性粉土存款的动态响应的特点和比较的努力，从两个不同的来源，一个可控震源振动筛名为T-Rex和控制爆破，多方向加载。水平可控震源振动频率为10 Hz，在粉土中产生的动态响应范围从线性弹性到非线性非弹性，诱导最大等效直接简单剪切（DSS）剪切应变高达0.15%，残余超孔隙水压力比为14.1%。爆炸剪切波的主频为9.6 ~ 14.6 Hz，在粉土存款中激发了非线性弹性和非线性非弹性响应，响应的最大值为1.14%，最大值为61%。重要的是，观察到这些响应受高频压缩波的影响最小。从这两种原位测试技术中可以看出，多向加载、超孔隙水压力、迁移和阻抗是实现粉土存款大孔隙水压力的主要因素。从T-Rex振动中观察到的循环门槛剪应变为0.007%~ 0.011%，并随初始土壤刚度而变化。这两种测试技术表明，原位剪切模量降低到最大剪切模量的90%，而通过，进一步降低到对应于的10 - 30%。在土壤结构的变化进行了量化，使用小应变剪切波速度测量之前和/或启动后，每个阶段的动态测试后，并与所观察到的增加和减少，分别为较浅和较深的三维元素，以下霸王龙震动。并排比较的动态响应和土壤特性来自这两个明显不同的现场测试技术验证使用控制爆破量化原位动态土壤特性和响应。
In this paper, efforts to characterize and compare the full-scale in situ three-dimensional (3D) dynamic response of a low-plasticity silt deposit to multidirectional loading from two different sources, a vibroseis shaker named T-Rex and controlled blasting, are presented. Horizontal vibroseis shaking at a frequency,, of 10 Hz, produced dynamic responses in the silt that ranged from linear-elastic to nonlinear-inelastic, inducing maximum equivalent direct simple shear (DSS) shear strains,, up to 0.15% and residual excess pore pressure ratios,, of 14.1%. Blast-induced shear waves with predominant frequencies ranging from 9.6 to 14.6 Hz excited nonlinear-elastic and nonlinear-inelastic responses in the silt deposit, withof 1.14% and maximumof 61%. Importantly, these responses were observed to be minimally influenced by high frequency compression waves. Multidirectional loading, and excess pore pressure,, migration and impedance were identified as the predominant factors for achieving the largein the silt deposit from these two in situ testing techniques. The cyclic threshold shear strain,, to triggerobserved from the T-Rex shaking equaled 0.007% to 0.011% and varied with the initial soil stiffness. The two testing techniques demonstrated that the in-situ shear modulus,, reduced to 90% of the maximum shear modulus,, at, whereas by,further reduced to 10 to 30% ofcorresponding toof. Changes in soil fabric were quantified using small-strain shear-wave velocity measurements performed before and/or upon initiation and after each stage of dynamic testing, and were linked to the observed increase and decrease infor the shallower and deeper 3D elements, respectively, following T-Rex shaking. The side-by-side comparison of the dynamic responses and soil properties derived from these two distinctly different field-testing techniques validate the use of controlled blasting for quantifying in situ dynamic soil properties and responses.