Browsing by Author "Liao, J. J."

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Bearing behavior and failure mechanism of a shallow foundation located on/behind the crest of a poorly cemented artificial sandstone
(2008-12-01)
Chang, J. C.
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Liao, J. J.
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Pan, Y. W.
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土木工程學系
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Department of Civil Engineering
Site characterization for the investigation of tunnel 8 collapse
(2004)
Huang, A. -B.
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Lin, C. P.
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Liao, J. J.
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Pan, Y. W.
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Tinkler, J.
A section of the high speed rail tunnel collapsed before the installation of permanent lining. The section designated as Tunnel 8 was located in Miaoli County in Northern Taiwan. The resulting spoil blocked approximately 50 in of the tunnel. A crater of 28 in in diameter, with a maximum depth of 12.1 in was formed at the ground surface, at approximately 60 in above the crown level of the tunnel. A site characterization program was carried out to define the boundaries of the collapsed zone, provide ground water information and stress and stiffitess parameters for the outer and final concrete lining design. Six 100 in deep, rotary cored holes were drilled vertically from the ground surface, within the collapsed zone and penetrated through the tunnel level. SPT, pressuremeter and suspension P-S logging tests were performed in these boreholes. Seven open boreholes, approximately 60 in deep, were drilled laterally from the concrete barricade at north and south end of the collapse zone within the tunnel at various angles. Geophysical tests which included seismic refraction tomography and resistivity tests were conducted from the ground surface. The data collected from the site characterization coupled with the geological background were analyzed and an image of the possible disturbance zone was created. The paper describes details of the site characterization, their interpretation and results of the analysis.
Wave propagation in inhomogeneous orthotropic rocks
(2012)
Wang, C. D.
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Wu, D. S.
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Liao, J. J.
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土木工程學系
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Department of Civil Engineering
Analytical solutions for body wave velocities are yielded for a continuously inhomogeneous orthotropic rock, in whichYoung\'s moduli (E-x, E-y, E-z), shear modulus (G(xy), G(yz), G(xz)), and the medium density (rho) all varied exponentially as depth increased. However, three Poison\'s ratios (u(xy), u(yz), u(xz)) of the orthotropic rocks are remained constants regardless of depth. The generalized Hooke\'s law, strain-displacement relationships, and equilibrium equations are integrated to constitute the governing equations. In these equations, displacement components are fundamental variables, and hence, the solutions of three quasi-wave velocities, V-P, V-SV, andV(SH), are generated for the inhomogeneous orthotropic media. The proposed solutions correlate well with the orthotropic solutions when the inhomogeneity parameter, alpha, is 0. In addition, parametric study results indicate that the magnitudes of wave velocity are markedly affected by (1) the inhomogeneity parameter; (2) the type and degree of geomaterial anisotropy; (3) the phase angle; and (4) the medium density. Consequently, one must consider the influence of inhomogeneous characteristic when investigating the behaviors of wave propagation in orthotropic rocks.
堰塞湖引致災害防治對策之研究(III)
(2004)
廖志中
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Liao, J. J.
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國立交通大學工學院防災工程研究中心
本研究為三年之計畫，目的是以堰塞湖形成機制與類型出發，分析天然壩穩定性，並考慮破壞機制形成對主河道下游之土石流洪水等二次災害之研究，堰塞湖處理可能引致災害防治對策的研擬，並制訂救災避難具體作業模式。經濟部水利署水利規劃試驗所有鑑於國內以往對於堰塞湖之成因、預測、及堰塞湖形成後之監測、預警及處理尚無有系統之研究，自九十一年至九十三年研擬委辦”堰塞湖引致災害防治對策之研究”計畫，其中第一年度計畫已依採購法經由公開評審，由交通大學防災工程研究中心執行此研究案。第二、三年計畫亦由水利規劃試驗所認可，由交通大學防災工程研究中心賡續執行。本年度(第三年)工作主要以第二年所開發的天然壩潰決模式進行案例分析，並對其處理及防治對策的研擬，並編制救災計畫，完成堰塞湖防災作業手冊等。