水化针刺GCL剪切破坏机理的试验研究

发布时间：2018-05-03 02:22

  本文选题：针刺GCL + 破坏机理　； 参考：《岩土工程学报》2017年08期

【摘要】：土工膨润土防水毯(GCL)的内部剪切强度是影响复合防渗衬里边坡稳定性的关键因素,加筋纤维的存在使针刺GCL的内部剪切强度明显高于非加筋GCL。含水化GCL的复合防渗衬里结构剪切试验会发生应力小峰值现象,但大都被研究人员忽视;加筋纤维对GCL峰值剪切强度的贡献处于定性阶段。通过开展GCL内夹钠基膨润土的饱和剪切试验和理论分析,证实应力小峰值现象为水化针刺GCL应力位移曲线的固有特征,并且小峰值应力代表了GCL内夹膨润土的抗剪强度贡献。以应力位移曲线上的应力小峰值现象为基础,将加筋纤维对GCL峰值剪切强度的贡献定量化,结合破坏机理分析了针刺GCL内部剪切破坏和应力位移发展过程。考虑针刺GCL剪切强度各部分贡献,提出了一种能反映针刺GCL破坏机理的峰值强度准则。
[Abstract]:The internal shear strength of geobentonite waterproof blanket is the key factor to influence the stability of composite impervious lining slope, and the internal shear strength of needled GCL is obviously higher than that of non-reinforced GCLs due to the existence of reinforced fiber. The shear test of hydrated GCL composite impervious lining structure will produce the phenomenon of small peak stress, but most of them are ignored by the researchers, and the contribution of reinforced fiber to the peak shear strength of GCL is in the qualitative stage. Through the saturated shear test and theoretical analysis of sodium bentonite in GCL, it is proved that the phenomenon of small peak stress is the inherent characteristic of GCL stress-displacement curve of hydration acupuncture, and the small peak stress represents the contribution of shear strength of GCL intercalated bentonite. Based on the phenomenon of small peak stress on the stress-displacement curve, the contribution of reinforced fibers to the peak shear strength of GCL is quantified, and the internal shear failure and stress displacement development process of needling GCL are analyzed in combination with the failure mechanism. Considering the contribution of various parts of the GCL shear strength, a peak strength criterion is proposed, which can reflect the failure mechanism of Acupuncture GCL.
【作者单位】： 南昌大学建筑工程学院;岩土力学与堤坝工程教育部重点实验室(河海大学);密歇根州环境保护厅;
【基金】：国家自然科学基金重点项目(41530637) 江西省青年科学基金项目(20161BAB216115) 岩土力学与堤坝工程教育部重点实验室开放基金项目(GH201404)
【分类号】：TU531.7

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