|本期目录/Table of Contents|

[1]郭瑶涵,吴能森*,徐 青,等.软土试样力学指标的扰动损伤评价[J].武汉工程大学学报,2015,37(05):35-40.[doi:10. 3969/j. issn. 1674-2869.2015. 05. 007]
 ,,et al.Disturbance damage evaluation of mechanical parameters of soft soil sample[J].Journal of Wuhan Institute of Technology,2015,37(05):35-40.[doi:10. 3969/j. issn. 1674-2869.2015. 05. 007]
点击复制

软土试样力学指标的扰动损伤评价(/HTML)
分享到:

《武汉工程大学学报》[ISSN:1674-2869/CN:42-1779/TQ]

卷:
37
期数:
2015年05期
页码:
35-40
栏目:
资源与土木工程
出版日期:
2015-05-31

文章信息/Info

Title:
Disturbance damage evaluation of mechanical parameters of soft soil sample
文章编号:
1674-2869(2015)05-0035-06
作者:
郭瑶涵吴能森*徐 青刘湘锴林智雄
福建农林大学交通与土木工程学院,福建 福州 350002
Author(s):
GUO Yao-hanWU Neng-senXU QingLIU Xiang-kaiLIN Zhi-xiong
College of Transportation and Civil Engineering, Fujian Agriculture and Forestry University, Fuzhou 350002,China
关键词:
结构性软土复合体损伤模型固结试验三轴试验损伤变量
Keywords:
structured soft claystructure damagethe complex damage modelconsolidation test triaxial testdamage variable.
分类号:
TU411
DOI:
10. 3969/j. issn. 1674-2869.2015. 05. 007
文献标志码:
A
摘要:
为研究钻探取样、运输及试样制备等环节对软土力学指标的扰动影响,开展了以下研究工作:首先,基于土的损伤评价理论,假设饱和软土粘聚力与结构强度成正比关系,提出损伤变量计算公式及其应用方法;然后以福州沿海软土为例,通过一系列固结试验及三轴试验,获得扰动土样及重塑土样的强度指标、压缩性指标,利用图解法推求得原位土的压缩性指标和结构强度,并藉此计算得到扰动土样损伤变量,进而对软土试样的扰动损伤进行量化分析和评价,主要结论如下:饱和软土的内摩擦角几乎不受扰动损伤影响,上述理论假设及依此建立的公式成立;对采用薄壁取土器取样,运输搬运环节采取了必要的保护措施,且严格按规范操作的试样,其损伤变量达20%以上,土样的压缩性增大约10%,粘聚力、结构强度、地基承载力下降10%左右;土样的宏观力学指标弱化不太显著,由此产生的工程设计计算结果偏差尚可接受;倘若取样、运输搬运及试验操作环节不够严谨,则试样的损伤影响必将相应放大,值得重视.
Abstract:
To study the disturbed effect of the mechanical indexes of soft soil in the course of drilling,transport,sample preparation and other steps,firstly,based on the theory of soil damage assessment,the assumption of cohesive force proportional to the structural strength for saturated soft soil was supposed which derives the damage variable formula and its application method. Secondly,a series of consolidation tests and three triaxle tests were conducted for Fuzhou coastal disturbed and remolded soft soil samples,and their strength and compressibility index were obtained,then the compression index and the structural strength of undisturbed soil were ascertained by using graphic method, thereby the disturbed soil sample’s damage variable was calculated. Based on above works,the damage effects of soft soil sample were analyzed and evaluated quantitatively,and the results show that the internal friction angle of saturated soft soil is almost not affected by the influence of disturbance damage,so the above theoretical assumption and accordingly the established formula are valid;the damage variable is more than 20% and the compression of soil samples increases about 10%; the cohesion,structural strength and the foundation bearing capacity decrease about 10% . It is necessary to take protective measures in transport process and operate strictly according to the standards in tests. the weakness macro-mechanics indexes of soft soil sample is not obvious,so the difference between calculation results can be accepted in engineering practice;if the sampling,transport and test operation link is not rigorous,the sample damage effect will be corresponding amplification, which is worthy of attention.

参考文献/References:

[1] 吴能森,朱德良.地基与基础[M]. 北京:中国建材工业出版社,2012:317-319.WU Neng-sen,ZHU De-liang.Ground and foundation[M].Beijing:China Building Materials Press,2012:317-319.(in Chinese)[2] 徐定.福州软土地区上浅基的岩土工程问题[J].岩土力学,1993,14(3):73-80.XU Ding.The Geotechnical problems of the shallow foundation in the soft soil area of Fuzhou[J]. Rock and Soil Mechanics,1993,14(3):73-80.(in Chinese)[3] 马正文,周春梅.京沪高铁软土地基物理力学参数的选取方法[J].武汉工程大学学报,2011,33(1):18-22.MA Zheng-wen,ZHOU Chun-mei.Discussion on selection of physical and mechanical parameters for Jing-Hu high speed railway soft foundations[J]. Journal of Wuhan Institute of Technology,2011,33(1):35-38.(in Chinese)[4] 孙红,赵锡宏.结构性软土的损伤及其对地基沉降的影响[J].岩土力学,1999,20(1):19-21. SUN Hong,ZHAO Xi-hong.Damage of structured soft soil and influence on settlement[J]. Rock and Soil Mechanics,1999,20(1):19-21.(in Chinese)[5] 施建勇,赵维炳.砂井施工对软粘土扰动的研究[J].河海大学学报:自然科学版,1997,25(2):30-33.SHI Jian?鄄yong,ZHAO Wei-bing.Effect of sand drainage construction on soft clay disturbance[J]. Journal of Hohai University:Natural Science,1997,25(2):30-33.(in Chinese)[6] 丁绿芳,郭志平,赵维炳.真空预压加固软基时土体的损伤[J].河海大学学报:自然科学版,2002,30(4):57-60.DING Lu-fang,GUO Zhi-ping,ZHAO Wei-bing.Damage to soft soil under vacuum preloading[J]. Journal of Hohai University:Natural Science,2002,30(4):57-60.(in Chinese)[7] 沈珠江.结构性粘土的弹塑性损伤模型[J]. 岩土工程学报,1993,15(3):21-28.SHEN Zhu-jiang.An elasto-plastic damage model for cemented clays[J]. Chinese Journal of Geotechnical Engineering,1993,15(3):21-28.(in Chinese)[8] 沈珠江.理论土力学[M].北京:中国水利水电出版社,2000:73-74.SHEN Zhu-jiang.Theory of soil mechanics[M]. Beijing:China Water & Power Press,2000:73-74.(in Chinese)[9] 沈珠江.结构性粘土的非线性损伤力学模型[J].水利水运科学研究,1993,9(3):247-255. SHEN Zhu-jiang.A nonlinear damage model for structured Clay[J]. Hydro-Science and Engineering,1993,9(3):247-255.(in Chinese)[10] 吴能森,侯伟生,赵尘.土的结构性损伤与损伤模型问题探讨[J].福建工程学院学报,2005,3(1):21-23.WU Neng-sen,HOU Wei-sheng,ZHAO Chen.Probing into problems of the ctructure damage of soil and the damage model[J]. Journal of Fujian University of Technology,2005,3(1):21-23.(in Chinese)[11] 水利部南京水利科学研究院.GB/T 50123-1999 土工试验方法标准[S].北京:中国计划出版社,1999Hydraulic Research Institute. GB/T 50123-1999 Standard for soil test method[S]. Beijing:China Planning Press,1999.(in Chinese)[12] 吴能森,赖榕洲,邹文平,等.含水率对花岗岩残积土邓肯-张模型参数影响[J].武汉工程大学学报,2013,35(9) :18-22.WU Neng-sen,LAI Rong-zhou,ZOU Wen-ping,et al.Influence of soisture content on parameters of Duncan-Chang model for granite residual soil[J]. Journal of Wuhan Institute of Technology,2013,35(9):18-22.(in Chinese)[13] 王立忠,李玲玲,丁利,等.温州煤场软土结构性试验研究[J].土木工程学报,2002,35(1):88-92,106.WANG Li-zhong,LI Ling-ling,DING Li,et al.Experimental study on the structure property of soft clay[J].Journal of Civil Engineering,2002,35(1):88-92,106.(in Chinese)[14] 中华人民共和国建设部.GB50007-2011 建筑地基基础设计规范 [S].北京:中国建筑工业出版社,2011.Ministry of Construction of the People's Republic of China.GB50007-2011 Code for design of building foundation[S]. Beijing:China Architecture & Building Press.(in Chinese)

相似文献/References:

备注/Memo

备注/Memo:
收稿日期:2015-03-17基金项目:福建农林大学高水平大学建设重点项目(113-612014018);福建农林大学创新(培育)团队建设项目(Pytd12006);福建省自然科学基金项目(2007J0357).作者简介:郭瑶涵(1989-),女,福建福州人,硕士研究生. 研究方向院道路与桥涵援* 通信联系人
更新日期/Last Update: 2015-07-01