含水率对花岗岩残积土动态流变损伤力学特性与损伤度影响试验研究

Experiment and research on dynamic rheological damage mechanics characteristics and damage degree influence with different moisture content of granite residual soil

以厦门地区某建筑工程地基浅层花岗岩残积土为试样,利用SDT-10微机控制电液伺服动态三轴流变仪为主要试验装备,研究了10%、15%、20%和23%等4种不同含水率试样的动态黏弹塑性流变损伤力学特性,分析了其正弦变化动态荷载作用下的动态流变损伤变形及动弹性模量变化特点。选取动弹性模量作为表述损伤过程的重要参数,由应变等效性假设推导出损伤变量,并研究了损伤程度随试样含水率的变化规律。研究结论对揭示软弱岩土动态流变损伤破坏动力学机制等具有重要的理论和现实意义。

The shallow granite residual soil of a constructional engineering in Xiamen is selected as thetest samples,and the SDT-10 microcomputer control electro-hydraulic servo dynamic triaxial rheometer isused as the main test equipment. Under the sine dynamic loading,dynamic rheological damage deformationand the variation characteristics of dynamic elastic modulus has been tested with moisture contents of10 %,15 %,20 % and 23 %. The analysis of the test data indicates that specimen presents dynamic visco-elastic-plastic behavior. The dynamic elastic modulus is selected as the important parameters to describethe damage process,and the damage variable is derived through the assumption of strain equivalence,thenstudied the damage variable change law with the moisture content. The findings have important science andrealism significance for us to disclose dynamic rheological damage dynamics mechanism of soft rock soil.