深圳大学学报理工版

为了研究界面粗糙度、温度变化和超固结比（overconsolidationratio，OCR）对桩-土界面剪切强度、孔压响应和体积变形影响，采用应变式直剪仪对直剪盒加以改造，分别对光滑和粗糙两种混凝土-饱和黏土界面进行非等温固结不排水剪切试验.结果表明，当OCR≤3时，随着OCR值减小，从室温升温或者降温和提高界面粗糙度均能提高界面剪切强度，孔隙水压力为正值，升温或者降温时的孔压均低于室温情况；当OCR=6时，孔隙水压力为负值，在剪切过程中发生剪胀，升温或者降温反而会略微降低界面的剪切强度.当OCR≤3时，增大界面粗糙度或升高温度，都会削弱土体的软化现象，而降温会强化土体的软化现象；当OCR=6时，界面剪切性质基本不变.说明界面粗糙度和温度变化对界面剪切特性的影响只在OCR值较小时比较显著，当OCR值足够大时，影响基本可以忽略.

In order to study the effects of interface roughness，temperature change and over consolidation ratio （OCR）on pile-soil interface shear strength，pore pressure response and volume change，the direct shear box was modified by strain direct shear instrument，and non isothermal consolidated undrained shear tests were carried out on smooth and rough concrete saturated clay interfaces respectively. The results show that when OCR≤3， decreasing OCR value，heating or cooling and increasing interface roughness can improve interface shear strength， pore water pressure is positive，and the pore pressure after heating or cooling is lower than that at room temperature. When OCR=6，the pore water pressure is negative，and dilatancy occurs in the shear process. On the contrary， heating or cooling will slightly reduce the shear strength of the interface. When OCR≤3，increasing the interface roughness and temperature will weaken the softening phenomenon of soil，and cooling will strengthen the softening phenomenon of soil. When OCR=6，the interfacial shear properties are basically unchanged. It means that the influence of interface roughness and temperature change on interface shear characteristics is significant only when the OCR value is small，and the influence can be basically ignored when the OCR value is large enough.

引言
1 试验方案
2 结果及分析
3 结论

图1 改造直剪盒装置示意图（单位：mm） Fig. 1 Schematic diagram of retrofitting direct shear box device（unit：mm）

表1 试验工况Table 1 Test conditions

图2 常温下不同界面粗糙度的剪切强度-剪切位移曲线Fig. 2 Shear strength versus shear displacement for different roughness interfaces at room temperature

图3 常温下不同粗糙度的孔压-剪切位移曲线Fig. 3 Pore water pressure as a function of shear displacement with different roughness at room temperature

图4 常温下不同界面粗糙度的竖向位移-剪切位移曲线Fig. 4 Vertical displacement as a function of shear displacement with different interface roughness at room temperature

图5 不同温度条件的界面剪切强度-位移曲线Fig. 5 Interfacial shear strength as a function of shear displacement at different temperatures

图6 不同温度条件下界面孔压-剪切位移曲线Fig. 6 Interfacial pore pressure as function of shear displacement at different temperatures

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备注

引言

1 试验方案

2 结果及分析

3 结论

期刊信息

备注

引言

1 试验方案

2 结果及分析

3 结 论

期刊信息

3 结论