洞庭湖砂纹淤泥质土动强度试验研究
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摘要
砂纹淤泥质土是夹有微薄层粉细砂洞庭湖湖相沉积软土,具有独特薄砂层构造。为了研究砂纹淤泥质土动强度特性,通过确定洞庭湖砂纹淤泥质土动强度的破坏标准,以DDS-70动三轴试验系统为试验手段,探讨了围压、振动频率对洞庭湖砂纹淤泥质土动强度特性的影响。研究表明:(1)动粘聚力和动内摩擦角随循环次数的增加总体上呈下降趋势;(2)循环次数较小时动强度下降较快,而当循环周次超过一定次数时,动强度进入缓慢衰减阶段;(3)相同的循环次数下频率和围压越高,动粘聚力和动内摩擦角越大。
The sandy grainmucky soil is a special structured lacustrine deposited soil with fine sand lenses from Dongting Lake. The dynamic strength envelope of Dongting sandy grainmucky soi samples was experimental studied by using DDS-70 dynamic triaxial testing device. The effect of confining pressure and applied cyclic axial frequency on the dynamic strength was evaluated. Throughout the investigation, the following conclusions are obtained: 1) The dynamic cohesion and dynamic internal friction angle values decrease the number of cyclic stress; 2) The sample strength decreases rapidly at the small number of cyclic stress and after the cyclic stress number reaches a certain value, dynamic strength decrease slowly with the increase of number of cycles; 3) under the same cyclic number, the higher the frequency and the confining pressure, the higher the dynamic cohesion and the dynamic internal friction angle.
The sandy grainmucky soil is a special structured lacustrine deposited soil with fine sand lenses from Dongting Lake. The dynamic strength envelope of Dongting sandy grainmucky soi samples was experimental studied by using DDS-70 dynamic triaxial testing device. The effect of confining pressure and applied cyclic axial frequency on the dynamic strength was evaluated. Throughout the investigation, the following conclusions are obtained: 1) The dynamic cohesion and dynamic internal friction angle values decrease the number of cyclic stress; 2) The sample strength decreases rapidly at the small number of cyclic stress and after the cyclic stress number reaches a certain value, dynamic strength decrease slowly with the increase of number of cycles; 3) under the same cyclic number, the higher the frequency and the confining pressure, the higher the dynamic cohesion and the dynamic internal friction angle.
引文
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[2] FRANCE J W, SANGREY D A. Effects of drainage in repeated loading of clays[J]. Journal of Geotechnical and Geoenvironmental Engineering, 1977,103(7):769-785.
[3] 蒋军,陈龙珠.长期循环荷载作用下粘土的一维沉降[J].岩土工程学报,2001(3):366-369.
[4] 王军,蔡袁强.循环荷载作用下饱和软黏土应变累积模型研究[J].岩石力学与工程学报,2008,27(2):331-338.
[5] 冷建,叶冠林,王建华,等.上海软土动剪切模量衰减规律的试验研究[J].岩土力学,2015(S1):387-391.
[6] 骆俊晖,缪林昌,石文博.软土初始动剪切模量及函数计算分析[J].东北大学学报(自然科学版),2015(8):1193-1198.
[7] 田兆阳,李平,郑志华,等.软土动力特性动三轴试验研究[J].地震工程学报,2017(1):95-99.
[8] 唐益群,王艳玲,黄雨,等.地铁行车荷载下土体动强度和动应力-应变关系[J].同济大学学报(自然科学版),2004(6):701-704.
[9] 王军,陈春雷,丁光亚.循环荷载下温州超固结软土动强度与变形分析[J].自然灾害学报,2009,18(4):125-131.
[10] 黄芮,张延军,李洪岩,等.辽河三角洲相沉积软土动力特性试验[J].吉林大学学报(地球科学版),2010,40(5):1115-1120.
[11] HANNA A M, JAVED K. Experimental investigation of foundations on sensitive clay subjected to cyclic loading[J]. Journal of Geotechnical & Geoenvironmental Engineering, 2014,140(11):1-12.
[12] 张向东,刘家顺,张虎伟.循环荷载作用下软土动力特性试验研究[J].公路交通科技,2014,31(5):1-7.
[13] 魏星,王刚.移动交通荷载下公路软土地基的沉降计算[J].岩土工程学报,2015,37(12):2217-2223.
[14] 郝斌,赵玉成,刘珍岩,等.波浪循环荷载作用下滨海软土水平向动力特性试验研究[J].土木建筑与环境工程,2016,38(1):116-121.
[15] 程宇慧,侯宏伟.典型海相软土动强度-应变特性试验研究[J].土工基础,2015(3):161-165.
[16] 王军.单、双向激振循环荷载作用下饱和软粘土动力特性研究[D].杭州:浙江大学,2007.