不同剪切速率下重塑西安黄土与混凝土接触面剪切性状的试验研究  

EXPERIMENTAL RESEARCH ON SHEAR BEHAVIOR OF INTERFACE BETWEEN REMOLDED XI’AN LOESS AND CONCRETE UNDER DIFFERENT SHEAR RATES

作　　者：张磊[1,2] 刘慧 王铁行 ZHANG Lei;LIU Hui;WANG Tiehang(School of Civil Engineering,Xi’an University of Architecture&Technology,Xi’an 710055,China;Shaanxi Key Laboratory of Geotechnical and Underground Space Engineering,Xi’an 710055,China)

机构地区：[1]西安建筑科技大学土木工程学院,西安710055 [2]陕西省岩土与地下空间工程重点实验室,西安710055

出　　处：《工业建筑》2019年第12期100-104,共5页Industrial Construction

基　　金：国家自然科学基金项目(51508455);陕西省自然科学基础研究计划项目(2019JM-232);陕西省教育厅专项科研计划项目(16JK1444);西安建筑科技大学青年科技基金项目(QN1614)

摘　　要：为深入研究黄土与结构物接触面剪切性状,通过控制土样含水率和剪切速率,对重塑西安黄土与混凝土接触面进行大型直剪试验。试验结果表明:随着法向应力的增加,接触面剪应力-剪切位移关系逐渐由弱软化型转变为弱硬化型进而发展成强硬化型,但其类型不受剪切速率影响。随着土样含水率的增大,接触面抗剪强度在低法向应力下先增大后减小、高法向应力下单调减小,接触面黏聚力先增大后减小,接触面内摩擦角及其变化速率逐渐减小。随着剪切速率的增大,剪应力逐渐减小,接触面黏聚力在低含水率下先增大后减小、中含水率下先减小后增大、高含水率下单调增大,接触面内摩擦角在低含水率下相差不大、高含水率下逐渐减小。剪切速率对重塑西安黄土与混凝土接触面剪切性状的影响随法向应力和土样含水率的增大而增大。In order to deeply study the shear characteristics of the interface between loess and structure, the large direct shear tests on loess-concrete interface were performed by changing moisture content of soil and shear rate. The test results indicated that with the increase of normal stress, the relationship between shear stress and shear displacement of interface changed from weak softening type to weak hardening type, and then to strong hardening type, which were not influenced by the shear rate. With the increase of moisture content of soil, the shear strength of interface first increased and then decreased under lower normal stress, while decreased monotonically under higher normal stress;the cohesive force first increased and then decreased;and both the internal friction angle and its changing rate decreased gradually. With the increase of shear rate, the shear stress of interface decreased gradually;the cohesive force first increased and then decreased under lower moisture content of soil, increased monotonically under higher moisture content of soil, while first decreased and then increased under other moisture content of soil;and the internal friction angle hardly changed under lower moisture content of soil, while decreased gradually under higher moisture content of soil. The influence of shear rate on the shear characteristics of remolded Xi’an loess-concrete interface became more obvious when the normal stress and moisture content of soil increased.

关 键 词：重塑西安黄土 接触面 剪切试验 剪切速率 含水率 

分 类 号：TU37[建筑科学—结构工程]