高聚物胶凝堆石料静力特性试验研究

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英文篇名：Experimental research on mechanical properties of PFA-reinforced rockfill materials 作者：刘平 ; 刘汉龙 ; 肖杨 ; 杨贵 英文作者：LIU Ping;LIU Han-long;XIAO Yang;YANG Gui;Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University;College of Civil and Transportation Engineering, Hohai University;Key Laboratory of New Technology for Construction of Cities in Mountain Area of Ministry of Education, Chongqing University;College of Civil Engineering, Chongqing University; 关键词：堆石料 ; 聚氨酯 ; 三轴试验 ; 抗剪强度 ; 剪胀 英文关键词：rockfill materials;;polyurethane;;triaxial tests;;shear strength;;dilatancy 中文刊名：YTLX 英文刊名：Rock and Soil Mechanics 机构：河海大学岩土力学与堤坝工程教育部重点实验室;河海大学土木与交通学院;重庆大学山地城镇建设与新技术教育部重点实验室;重庆大学土木工程学院; 出版日期：2015-03-10 出版单位：岩土力学 年：2015 期：v.36;No.244 基金：国家自然科学基金资助(No.51479059);; 长江学者和创新团队发展计划资助(No.IRT1125);; 江苏省自然科学基金(No.BK20141279);; 江苏省普通高校研究生科研创新计划项目(No.2013B26614) 语种：中文; 页：YTLX201503023 页数：6 CN：03 ISSN：42-1199/O3 分类号：146-151

摘要

采取加固措施可提高土体抗剪强度、减小变形等。采用聚氨酯高聚物胶凝堆石料加固土石坝以改良堆石料强度、变形特性。开展了聚氨酯胶凝堆石料三轴剪切试验研究,结果表明:聚氨酯胶凝堆石料偏应力-轴向应变曲线具有明显的非线性,抗剪强度提高;采用抛物线拟合偏应力-轴向应变曲线,可反映其应变软化和应变硬化,并得到初始弹性模量随聚氨酯含量的提高而提高;聚氨酯泡沫填充堆石颗粒间孔隙并将堆石颗粒黏结在一起,减少颗粒破碎、颗粒重排列,使堆石料剪缩特征减弱,当聚氨酯含量高时表现出剪胀;聚氨酯增加了堆石料准黏聚力,对内摩擦角无明显影响。通过有限元方法对堆石坝变形和稳定性进行分析,结果表明,聚氨酯加固堆石坝可减少边坡浅层滑动,增大滑弧深度,提高坝坡稳定安全系数。
        The reinforcement could increase the shear strength of soil and reduce the deformation of soil. Polyurethane foam adhesive(PFA) is adopted to reinforce rockfill materials. A series of triaxial shear tests on the PFA-reinforced rockfill materials is conducted. The test results show that the PFA-reinforced rockfill materials exhibit a nonlinear deviatoric stress-axial strain behavior. The shear strength increases with increasing the PFA ratio. A parabola formula is used to fit the deviatoric stress-axial strain curve and reflect the strain softening and hardening behaviors of the PFA-reinforced rockfill materials. The initial elastic modulus of the PFA-reinforced rockfill materials increases with increasing the PFA ratio. The mechanical effect of the PFA is to fill the voids among particles and then to bond the particles. As a result, the particle breakage and rearrangement reduce and the feature of volumetric shrinkage decreases. The dilatancy behavior increases with increasing the PFA ratio. Adding PFA into rockfill materials can enhance the cohesion, but it has no obvious effect on the frictional angle. The deformation and stability of a dam are analyzed using the finite element method. It is shown that the PFA-reinforced method can largely reduce the shallow slide of slope, enlarge the depth of the slip circle and increase the stability of rockfill dam.

引文

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