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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。
The internal shear strength of geotextile bentonite waterproof blanket (GCL) is the key factor that affects the stability of the compound anti-leaching lining slope. The presence of the fiber reinforced GCL has significantly higher internal shear strength than GCL. The shear stress test of hydrated GCL composite anti-seepage lining structure will occur the phenomenon of small stress peak, but most of them are neglected by researchers. The contribution of reinforced fiber to GCL peak shear strength is in the qualitative stage. By carrying out the saturated shear test and theoretical analysis of sodium bentonite in GCL, it is confirmed that the small stress peak value is an intrinsic feature of the GCL stress-displacement curve and the small peak stress represents the contribution of the shear strength of bentonite in GCL . Based on the phenomenon of small stress on the stress-displacement curve, the contribution of the reinforcement fibers to the peak shear strength of GCL was quantified. Combined with the failure mechanism, the development of shear failure and stress-displacement in the GCL was analyzed. Considering the contribution of each component of GCL shear strength of acupuncture, a criterion of peak intensity that can reflect the failure mechanism of acupuncture GCL was proposed.