
第29卷第2期 2015年4月
现代地质 GEOSCIENCE
Vol.29No.2
Apr.2015
黏土抗渗强度试验研究一一以桂林铁山工业园
工程场地红黏土为例
姜伏伟1.2.3,雷明堂1.3,覃有强1.3,戴建玲1.3
(1.中国地质科学院岩溶地质研究所,广西桂林541004;2.中国地质大学(北京)水资源与环境学院,北京100083:
3.中国地质科学院岩溶塌陷防治重点实验室,广西桂林541004)
摘要:土的渗透变形是很多地质灾害及岩土工程事故的主要原因之一,但目前黏土的渗透破坏临界条件研究较少。从微观角度分析了黏土在外界驱动水压作用下的渗透破坏过程,以抗渗强度作为黏土渗透破坏临界条件参数。为获取此参数,设计了模拟外界驱动水压作用下,黏土渗透破坏过程的抗渗强度试验装置及方法。选取广西桂林红黏土层底部原状样,测试了32组不同厚度试样,并得出各试样抗渗强度。依据试验结果,分析了抗渗强度受渗透方式和尺寸效应的影响,并采用ArcGis软件统计分析试样抗渗强度的差异性。最终选择15组实际渗透厚度2.5cm试样的试验结果平均值40.8kPa,为工程场地黏土抗渗强度值。通过比较抗渗强度值与钻孔实际监测渗透水压,评价工程场地内黏土渗透破坏形成土洞塌陷的可能性。评价结果表明,目前工程场地内黏土渗透驱动水压低于抗渗强度,不具备形成土洞的
条件。经实地勘察,评价结果符合现场实际情况。关键词:红黏土;渗透变形;抗渗强度;临界条件
中图分类号:P642.16
文献标志码:A
文章编号:10008527(2015)02043408
ExperimentalStudyonTestingtheAnti-permeabilityStrengthof Clay SeepageFailure:A Casefrom the EngineeringField of
Tieshan Industrial Park in Guilin,China
JIANG Fu-wei'.2.3, LEI Ming-tang'3, QIN You-qiang3, DAI Jian-ling'-3
(1. Institute of Karst Geology, CAGS, Gurilin, Guangxi 541004, China;
2. School of Water Resources and Enzironment, China Unirersity of Geosciences, Beijing 100083, China;
3. Key Laboratory of Karst Collapse Pretention, CAGS, Guilin, Guangri 541004, China)
Abstract: A lot of geological hazards and geotechnical engineering failure cases including slope, dam, construct foundation, et al, are caused by soil seepage deformation. However, it is seldom to study the critical condition eeesaease sure, and takes the anti-permeability strength as the critical condition for judging clay seepage failure. Firstly, aasaaaeesaoesaea ly, 32 undisturbed samples of clay were tested with different thickness, which are from the engineering field of Tieshan industrial park in Guilin, China. With the testing values of 32 samples, it is concluded that the two factors of seepage ways and sample size influence the anti-permeability strength, and the test results are made by statistical analysis of ArcGis. The average value of 15 samples of 2.5 cm thicknesses, 40. 8 kPa, is the anti-permeability strength of the engineering field. Finally, by comparing the strength with the seepage water pres-
收稿日期:2014-10-09;改回日期:2014-12-10;责任编辑:孙义梅。
基金项目:国家自然科学基金项目(41272355):国土资源部公益性行业科研专项经费项目(201211083);国土资源部地质调查
项目(1212011220191)。
作者简介:姜伏伟,男,博士研究生,1987年出生,地质工程专业,主要从事岩土力学与岩溶工程灾害防治研究。
Email:jfwei_666@126.com。