原料组分对动力学相似材料性质影响的试验研究  

EXPERIMENTAL STUDY ON PROPERTY OF DYNAMIC SIMILAR MATERIAL MADE OF DIFFERENT RAW MATERIALS

作　　者：李光 马凤山[1] 徐佩华[2] LI Guang;MA Fengshan;XU Peihua(Key Laboratory of Shale Gas and Geoengineering,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029;College of Construction Engineering,Jilin University,Changchun 130026;University of Chinese Academy of Sciences,Beijing 100049)

机构地区：[1]中国科学院地质与地球物理研究所,中国科学院页岩气与地质工程重点实验室,北京100029 [2]吉林大学建设工程学院,长春130026 [3]中国科学院大学,北京100049

出　　处：《工程地质学报》2019年第3期676-681,共6页Journal of Engineering Geology

基　　金：国家重点研发计划课题(2018YFC1505301);国家自然科学基金项目(41831293,41772341,41302218)资助~~

摘　　要：随着振动台、离心机等动力学模型试验方法的不断发展,对于动力学相似材料的要求也愈加精细。在满足动力学相似理论的基础上,如何快速、准确地配制出性质合理的相似材料是试验中至关重要的一步。本文以粒度不同的河沙、重晶石粉、铁粉、云母片为原料,以速干水泥为胶结物,对不同材料混合的动力学相似材料性质进行了试验研究。试验结果表明:(1)级配良好的骨料所配置的相似材料密度较大,且颗粒间断级配越大,骨胶比对相似材料密度影响越大;(2)以河砂为骨料、水泥为胶结物,可以配制出密度为1.5~2.2 g·cm^-3、动泊松比0.2~0.4、动弹性模量2.5~5.5GPa的动相似材料;(3)铁粉的增重效果比重晶石粉显著,且铁粉试件的动、静弹性模量随铁粉增加而显著增大,而重晶石粉比例的变化对重晶石粉试件的动、静弹性模量影响不大,在配制“高重低强”的动力学相似材料时,重晶石粉是更理想的原料;(4)随着云母用量的不断增加,试件的密度、动泊松比和动、静弹性模量均显著降低,云母片是很好的减强剂,可以用来模拟岩体间软弱夹层或结构面。With the development of dynamic model test such as centrifuge and shaking table,the requirement for dynamic similar material is more detailed.On the basis of dynamic similitude theory of model test,how to select the ratio of raw materials accurately plays an important role in the model test.This paper selects river sand with different particle gradations,iron powder,barite powder and mica sheet as the raw materials,and jet cement as the cementing agent.It then studies the physical and mechanical property of the similar materials with the elastic wave speed simulation measurement and uniaxial compressive test.The results show the follows.(1)The density,dynamic and static elasticity modulus of the specimens with better particle gradation are bigger and the sand-blinder ratio has a greater influence on the density of similar material as the gap gradation enlarges.(2)The dynamic similar material can be obtained whose density is between 1.5-2.2 g·cm^-3,dynamic Poisson s ratio is between 0.2-0.4 and dynamic elasticity modulus is between 2.5-5.5Gpa if we choose the river sand as aggregate and cement as cementing agent.(3)Iron powder has better effect on gaining weight than the barite powder.The dynamic and static elasticity modulus of the barite specimen have no obvious changes with the change of barite powder content.Therefore,barite powder is an ideal raw material to make dynamic similar material with high-density and low-strength.(4)With the increase of mica sheet content,the dynamic Poisson s ratio,dynamic and static elasticity modulus of specimen can reduce evidently.As a result,the mica sheet is not suitable for similar material with high density but it can make similar material of weak intercalation or structural plane.

关 键 词：地质力学 物理模拟 动力学相似材料 试验研究 

分 类 号：TU455[建筑科学—岩土工程]