| 南海北部区域黏土循环动力特性试验研究 |
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| 引用本文： | 张炜,李亚,周松望,蒋正波,吴非,梁文洲.南海北部区域黏土循环动力特性试验研究[J].岩土力学,2018,39(7):2413-2423. |
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| 作者姓名： | 张炜 李亚 周松望 蒋正波 吴非 梁文洲 |
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| 作者单位： | 1. 中海油研究总院，北京 100028；2. 中海油田服务股份有限公司物探事业部，天津 300451 |
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| 基金项目： | 国家自然科学基金项目(No. 51741909)。 |
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| 摘 要： | 采用南海北部区域油田场址钻孔原状土样，开展黏土循环动力特性试验研究。结合共振柱与应变控制的循环单剪试验，获取动剪切模量和阻尼比随循环剪应变的变化规律，将最大动剪切模量与原位静力触探的计算结果进行对比。开展应力控制的循环单剪试验，采用对称加载方式获取土样动强度阈值，基于该阈值，通过单、双向加载方式获取土样动强度包络线，并将试验结果与Drammen黏土及世界范围内其余区域黏土进行对比。该研究初步获取了南海北部区域性黏土的循环特性及动力学参数，为南海北部区域油气田结构设计和地质风险评估提供基础资料，掌握了循环动力特性试验方法，为岩土工程动力学试验研究及数据分析提供技术参考。
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| 关 键 词： | 南海北部 黏土 循环荷载 动剪切模量 阻尼比 动强度 |
| 收稿时间： | 2016-09-22 |
Experimental research on cyclic behaviors of clay in the northern region of South China Sea |
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| ZHANG Wei,LI Ya,ZHOU Song-wang,JIANG Zheng-bo,WU Fei,LIANG Wen-zhou.Experimental research on cyclic behaviors of clay in the northern region of South China Sea[J].Rock and Soil Mechanics,2018,39(7):2413-2423. |
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| Authors: | ZHANG Wei LI Ya ZHOU Song-wang JIANG Zheng-bo WU Fei LIANG Wen-zhou |
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| Institution: | 1. General Research Institute, China National Offshore Oil Corporation, Beijing 100028, China; 2. Marine Survey & Geotech Operating Company, China Oilfield Services Ltd., Tianjin 300451, China |
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| Abstract: | Experimental research on cyclic behaviors of clay is performed based on undisturbed soil samples from the boreholes of oil field sites in northern region of South China Sea. Combined resonant column test and strain-controlled cyclic direct simple shear test, the dynamic shear modulus and damping ratio of the soils over a range of cyclic shear strain are studied. Additionally, the maximum dynamic shear moduli are compared with the calculation results on the basis of cone penetration test. Stress-controlled cyclic direct simple shear test is developed to capture the threshold value of cyclic strength by symmetric loading method. And then, based on the threshold value, the envelope curves of cyclic strength can be obtained by one-way and two-way loading methods. The test data are compared with Drammen clay and other clays obtained from different locations in the world. The cyclic performance and dynamic parameters of soils in the northern region of South China Sea are studied, which provides the basic data for structure design and evaluation of geological risks. Besides, experimental methods of cyclic tests are mastered, which can provide technical reference for dynamic experimental study and data analysis of geotechnical engineering. |
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| Keywords: | northern South China Sea clay cyclic loading dynamic shear modulus damping ratio cyclic strength |
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