Monotonic, Cyclic, and Post-Cyclic Response of Willamette River Silt at the Van Buren Bridge
Monotonic, Cyclic, and Post-Cyclic Response of Willamette River Silt at the Van Buren Bridge
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范布伦桥威拉米特河淤泥的单调、循环和后循环响应
DOI：
10.1061/9780784484043.042
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Evans, T. Matthew
中科院分区：
文献类型：
--
作者：
Dadashiserej, Ali;Jana, Amalesh;Ortiz, Susan C.;Walters, James J.;Stuedlein, Armin W.;Evans, T. Matthew
本研究对轻度超固结、低塑性淤泥沉积物的单调、循环和后循环响应进行了实验室研究，旨在支持俄勒冈州科瓦利斯市威拉米特河拟议桥梁更换的岩土工程设计。设计地震灾害相当于975年一遇，其中卡斯卡迪亚俯冲带的灾害贡献最大。将完整的天然样本的响应与由相同材料重建的样本的响应进行比较，以比较土壤结构的影响。对低塑性淤泥沉积物进行的恒定体积循环应力控制直接简单剪切试验 (CDSS) 显示出循环移动型行为，并且循环阻力随着 OCR 的增加而增加。循环阻力比 (CRR) 与循环次数 N 之间的幂关系指数被证明小于细粒塑性土循环软化简化方法中通常假设的指数。尽管密度较高，但重建样本的循环阻力比未扰动的样本低约 16%，这表明土壤结构对天然淤泥土壤的循环阻力的重要性。发现淤泥沉积物的循环后体积应变与 OCR 无关，并且随着循环测试期间产生的最大超孔隙压力比而增加。
This study presents a laboratory investigation of the monotonic, cyclic, and post-cyclic responses of a lightly overconsolidated, low plasticity silt deposit conducted to support the geotechnical design of a proposed bridge replacement crossing the Willamette River in Corvallis, OR. The design seismic hazard corresponded to the 975-year return period with the Cascadia Subduction Zone contributing the greatest portion of the hazard. The response of the intact, natural specimens was compared to that of specimens reconstituted from the same material for comparison of the effect of soil fabric. Constant-volume cyclic stress controlled direct simple shear tests (CDSS) conducted on the low plasticity silt deposit showed cyclic mobility type behavior and increases in cyclic resistance with OCR. The exponent of the power relationship between cyclic resistance ratio (CRR) and the number of cycles,N, was shown to be smaller than that commonly assumed within the simplified method for cyclic softening of fine-grained plastic soil. Despite higher density, the reconstituted specimens exhibited approximately 16% lower cyclic resistance than their undisturbed counterparts, indicating the importance of soil fabric on the cyclic resistance of natural silt soils. The post-cyclic volumetric strain of the silt deposit was found to be independent of OCR and increased with the maximum excess pore pressure ratio generated during the cyclic tests.
用于实验室元素测试的低塑性中间土的泥浆沉积方法
影响因子：
1.6
作者：
C. P. Krage;A. B. Price;W. Lukas;J. DeJong;D. DeGroot;R. Boulanger
通讯作者：
R. Boulanger