三峡库区滑坡土石混合体与桩的接触面力学特性试验研究

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Abstract Due to the influence of water level change and seasonal rainfall in the reservoir area of Three Gorges，the mechanical properties of interface between anti-sliding pile and macadam soil are very important for the reinforcement design and safety operation of accumulative landslide. Based on a typical macadam soil landslide，a series of shear tests on interface mechanical properties are conducted under the conditions of various water contents，macadam ratios and shear rates. Accordingly，the functional relationship of shear strength parameters and water contents，macadam ratios is built. The change characteristics of mechanical properties of interface between pile and macadam soil are discussed. The results indicate that the shear strength，inner friction angle and cohesion decrease as the water content increases. However，for the increment in macadam ratios，the cohesion will decrease gradually，but the shear strength and inner friction angle of interface decrease firstly and then increase after a critical value，the change trend obeys parabolic relation. Besides，different shear rates have obvious influence on the parameters of shear strength；the shear strength will increase when the shear rates are promoted. The experimental results will not only provide significant data for the reinforcement design on macadam soil slope stabilized by anti-sliding piles，but also contribute a lot to the interface constitutive model and long-term stability analysis of reinforcement engineering.

Key words： slope engineering macadam soil anti-sliding pile interface mechanical properties

Received: 15 March 2010

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https://rockmech.whrsm.ac.cn/EN/Y2011/V30/IS1/2888

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