疏水Kızılırmak砂固结不排水单调剪切响应

IF 0.8 4区 工程技术 Q4 ENGINEERING, CIVIL Teknik Dergi Pub Date : 2021-03-01 DOI:10.18400/tekderg.543306
K. Cetin, Hüseyin Tatar
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引用次数: 0

摘要

亲水(可湿)砂的岩土力学性质在文献中得到了广泛的讨论。然而,沙子在暴露于自然界中的疏水剂后可能会获得疏水(不可湿性)特性。关于疏水砂的响应的现有研究数量非常有限,并且主要集中在其环境和水文方面。为了缩小这一差距,设计了一个受控的实验室测试程序,包括18个静态应变控制固结不排水三轴剪切试验。对不同相对密度的完全饱和亲水和疏水重构克孜利尔马克砂样进行了孔隙水测量试验。用质量为1%和2%的WD-40润滑剂制备疏水样品。通过比较疏水砂样与常规(亲水)砂样的应力-超孔隙水压力-应变响应,评价疏水剂的作用。试验结果表明,疏水剂的加入通过降低超孔隙水压力的产生,提高了低围应力(~100kPa)条件下砂土的剪胀性。在较高的围应力(~400kPa)下,这种影响不太明显。此外,疏水剂的添加量不受砂样初始相对密度和围应力水平的影响,不影响其有效抗剪角的系统和显著变化。
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Consolidated Undrained Monotonic Shearing Response of Hydrophobic Kızılırmak Sand
Geotechnical properties of hydrophilic (wettable) sands have been widely discussed in the literature. However, sands may gain hydrophobic (non-wettable) properties after being exposed to a hydrophobic agent in the nature. The number of available studies regarding the response of hydrophobic sands is very limited, and mostly focus on their environmental and hydrological aspects. To close this gap, a controlled laboratory testing program, consisting of 18 static strain-controlled consolidated undrained triaxial shear tests, was designed. Tests were performed on fully saturated hydrophilic and hydrophobic re-constituted Kizilirmak sand samples of different relative densities with pore water measurements. Hydrophobic samples were prepared by using 1 and 2 % WD-40 lubricant by mass. The effect of hydrophobic agent was assessed by comparing the stress – excess pore water pressure - strain responses of hydrophobic sand samples with those of conventional (hydrophilic) sand samples. Test results revealed that addition of hydrophobic agent increases the dilatancy of sands at low confining stresses (~100kPa) by decreasing the excess pore water pressure generation. At higher confining stresses (~400kPa) this effect is less pronounced. Moreover, the addition of hydrophobic agent up to 2% by mass does not systematically and significantly change the effective angle of shearing resistance of sand samples, independent of their initial relative density and confining stress levels.
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来源期刊
Teknik Dergi
Teknik Dergi 工程技术-工程:土木
自引率
30.80%
发文量
65
审稿时长
>12 weeks
期刊介绍: The scope of Teknik Dergi is naturally confined with the subjects falling in the area of civil engineering. However, the area of civil engineering has recently been significantly enlarged, even the definition of civil engineering has somewhat changed. Half a century ago, engineering was simply defined as “the art of using and converting the natural resources for the benefit of the mankind”. Today, the same objective is expected to be realised (i) by complying with the desire and expectations of the people concerned and (ii) without wasting the resources and within the sustainability principles. This change has required an interaction between engineering and social and administrative sciences. Some subjects at the borderline between civil engineering and social and administrative sciences have consequently been included in the area of civil engineering. Teknik Dergi defines its scope in line with this understanding. However, it requires the papers falling in the borderline to have a significant component of civil engineering.
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