盾构工作井水泥加固土承载机制试验研究

发布时间：2018-03-04 15:21

本文选题：盾构始发与接收　切入点：三轴试验　出处：《地下空间与工程学报》2016年S2期 　论文类型：期刊论文

【摘要】：通过考虑不同水泥掺量、不同围压等试验条件下的固结不排水三轴试验,研究了盾构始发和接收端粘性加固土和砂性加固土力学性质,并根据试验结果对两者加固土承载机制进行了分析,研究结果表明:(1)无论原状土土性如何,水化物的存在使得加固土的应力-应变曲线由原状土的硬化型向软化型转变,且曲线阶段性明显;(2)加固土偏应力峰值由摩擦分量和粘结分量组成,当A_w5%时,以粘结分量为主,反之则以摩擦分量为主;(3)粘性加固土和砂性加固土两者虽原状土土性不同,但水化物粘结的存在,使得两者的力学性质和承载机制基本类似,但两者应力应变曲线的软化程度不同。
[Abstract]:Based on the undrained triaxial test under the conditions of different cement content and different confining pressure, the mechanical properties of clay reinforced soil and sand reinforced soil at the beginning and receiving end of shield machine are studied. According to the experimental results, the load-bearing mechanism of the two soils is analyzed. The results show that, regardless of the soil properties of the undisturbed soil, the existence of hydrates makes the stress-strain curve of the strengthened soil change from the hardening type to the softening type of the undisturbed soil. And the peak value of deflection stress of reinforced soil is composed of friction component and bond component, when AW is 5%, the adhesive component is the main component, whereas the friction component is the main component / / 3) though the clay and sand reinforced soil are different in soil properties, the peak value of deformation stress of the strengthened soil is composed of friction component and bond component. But the existence of hydrated bond makes the mechanical properties and load-bearing mechanism of both are basically similar, but the softening degree of stress-strain curve is different between them.
【作者单位】：珠海大横琴股份有限公司;同济大学地下建筑与工程系;上海隧道工程有限公司;
【基金】：珠海大横琴股份有限公司和上海隧道工程有限公司资助项目(2015-sk-4) 国家自然科学资金(41372276)
【分类号】：TU472

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