[最新文献]循环单轴和三轴剪切的液化阻力: 一个比较研究 [11/8/2020]

1 论文

Liquefaction resistance from cyclic simple and triaxial shearing: a comparative study 循环单轴和三轴剪切的液化阻力：一个比较研究

Abstract: While cyclic triaxial (CTX) tests are widely used in liquefaction studies due to their simplicity, direct simple shear (DSS) tests and their ilk (e.g., the combined triaxial simple shear, TxSS) are more representative of stress conditions produced during an earthquake. Therefore, the CTX results should be properly correlated to simulate field conditions. In the current study, a series of CTX testing results performed on reconstituted samples of Baie-Saint-Paul, Ottawa C-109, and Quebec CF6B sands are compared to the corresponding TxSS and DSS results under both stress- and strain-controlled conditions. The cyclic TxSS stress-controlled tests are numerically simulated by adopting a coupled energy-based pore water pressure model using the computer code, FLAC. The TxSS numerical results are successfully compared with those obtained experimentally from (1) alternative stress-controlled TxSS, (2) available liquefaction potential curves (CSR-Nliq) in the literature, and (3) stress-controlled DSS testing results. As anticipated, the outcomes of the cyclic stress-controlled CTX testing results in the form of liquefaction potential curves are usually higher than that of the TxSS testing results. In contrast, due to the difference in the applied (strain-controlled tests) and the induced (stress-controlled tests) strains, the liquefaction resistance curves of TxSS are higher than those of CTX under cyclic strain-controlled test.

摘要：循环三轴(CTX)试验因其简单性而被广泛用于液化研究，而直接剪切(DSS)试验及其同类试验(如组合三轴简剪，TxSS)更能代表地震时产生的应力条件。因此，CTX试验结果应与模拟现场条件相关。在本研究中，对Baie-Saint-Paul、渥太华C-109和魁北克CF6B砂的重构样品进行的一系列CTX测试结果与相应的TxSS和DSS在应力控制和应变控制条件下的结果进行了比较。循环TxSS应力控制试验采用基于能量的耦合孔隙水压力模型，用计算机程序FLAC进行数值模拟。TxSS数值结果与实验得到的结果进行了成功的对比，这些结果来自于(1)替代应力控制的TxSS，(2)文献中可用的液化势曲线(CSR-Nliq)，以及(3)应力控制的DSS测试结果。正如预期的那样，循环应力控制CTX测试结果的液化势曲线形式的结果通常高于TxSS测试结果。相反，由于施加(应变控制试验)和诱导(应力控制试验应变的不同，在循环应变控制试验下，TxSS的液化阻力曲线高于CTX。

2 相关文献

Note: '相关文献' 是按照Google的排序算法产生出来的.

[1] Liquefaction resistance of undisturbed and reconstituted samples of a natural coarse sand from undrained cyclic triaxial tests

[2] Cyclic triaxial test liquefaction resistances of soils

[3] Determination of cyclic resistance of clean sands from cone penetration test based on state parameter

[4] Liquefaction resistance of siltysand based on laboratory undisturbed sample and cpt results

[5] Effect of cyclic loading frequency on liquefaction prediction of sand

[6] Experimental assessment of the liquefaction resistance of calcareous biogenous sands

[7] Cyclic behaviour and resistance of saturated sand under non-symmetrical loading conditions

[8] Liquefaction potential of reinforced sand

[9] Resistance of partly saturated sand to liquefaction with reference to longitudinal and shear wave velocities

[10] Cyclic resist clic resistance - shear w ance - shear wave velocity relationships tionships for monterey and cabo rojo carbonate sand

[11] Static and cyclic liquefaction potential of fraser delta sand in simple shear and triaxial tests

[12] Effects of relative density and effective confining pressure on liquefaction resistance of sands

[13] Cyclic undrained triaxial and torsional shear strength of sands for different sample preparation methods

3 参考文献

[1] Archambault-Alwin X, Karray JM, Chekired M (2017) The influence of back pressure on the cyclic resistance of saturated tailings using the triaxial-simple shear device. In: Proceedings of the 70th Canadian geotechnical conference, 1–4 October, Ottawa

[2] Ardoino F, Bertalot D, Piatti C, Zanoli O (2015) Effect of pore pressure build-up on the seismic response of sandy deposits. In: Meyer V (ed) Frontiers in offshore geotechnics III. Taylor & Feancis Group, London

[3] ASTM D6528–17 (2017) Standard test method for consolidated undrained direct simple shear testing of fine grain soils. ASTM International, West Conshohocken, www.astm.org

[4] Chang WJ, Phantachang T, Ieong WM (2016) Evaluation of size and boundary effects in simple shear tests with distinct element modeling. J Geo Eng 11(3):133–142. https://doi.org/10.6310/jog.2016.11(3).3

[5] Chehat A, Hussein MN, Abdelazize M, Chekired M, Harichane Z, Karray M (2019) Stiffness- and damping-strain curves of sensitive champlain clays through experimental and analytical approaches. Can Geotech J 56(3):364–377. https://doi.org/10.1139/cgj-2017-0732

[6] Chekired M, Lemire R, Karray M, Hussien MN (2015) Experiment setup for simple shear tests in a triaxial cell: TxSS. In: Proceedings of the 68th conference on Canadian of Geotechnical, Quebec, paper no. 365

[7] Dobry R, Abdoun T (2017) Recent findings on liquefaction triggering in clean and silty sands during earthquakes. J Geotech Geoenvironmental Eng 143(10):04017077. https://doi.org/10.1061/(ASCE)GT.1943-5606.0001778

[8] Karray M, Chekired M (2019) Triaxial simple shear test: TxSS. In: Proceedings of the 7th international symposium on deformation characteristics of geomaterials (IS Glasgow 2019). Paper no. 02014, pp 1–6

[9] Karray M, Hussien MN, Chekired M (2015) Evaluation of compatibility between existing liquefaction charts in Eastern Regions of North America. In: 68e Conférence Canadienne de Géotechnique et 7e Conférence Canadienne Sur Le Pergélisol, 20 Aug, 23 Sep 2015, Québec

[10] Khashila M (2019) Assessment of liquefaction potential using the new combined triaxial simple shear apparatus (TxSS). Ph.d. dissertation, Université de Sherbrooke

[11] Khashila MM, Hussien MN, Karray M, Chekired M. 2018. Use of pore pressure build-up as damage metric in computation of equivalent number of uniform strain cycles. Can Geotech J.: 55(4): 538–550. https://doi.org/https://doi.org/10.1139/cgj-2017-0231.

[12] Konstadinou M, Georgiannou VN (2013) Cyclic behaviour of loose anisotropically consolidated Ottawa sand under undrained torsional loading. Géotechnique 63(13):1144–1158

[13] Konstadinou M, Georgiannou VN (2014) Prediction of pore water pressure generation leading to liquefaction under torsional cyclic loading. Soils Found 54(5):993–1005. https://doi.org/10.1016/j.sandf.2014.09.010

[14] Mandokhail SUJ, Park D, Yoo JK (2017) Development of normalized liquefaction resistance curve for clean sands. Bull Earthq Eng 15(3):907–929

[15] Wichtmann T, Triantafyllidis T (2016a) An experimental database for the development, calibration and verification of constitutive models for sand with focus to cyclic loading: part I—tests with monotonic loading and stress cycles. Acta Geotech 11:739–761

[16] Wichtmann T, Triantafyllidis T (2016b) An experimental database for the development, calibration and verification of constitutive models for sand with focus to cyclic loading: part II—tests with strain cycles and combined loading. Acta Geotech 11:763–774

[17] Zekkos D, Athanasopoulos-Zekkos A, Hubler J, Fei X, Zehtab K, Marr W (2018) Development of a largesize cyclic direct simple shear device for characterization of ground materials with oversized particles. Geotech Test J. https://doi.org/10.1520/GTJ20160271

[18] Zhang L, Evans TM (2018) Boundary effects in discrete element method modeling of undrained cyclic triaxial and simple shear element tests. Granular Matter 20(4):60

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