泡沫混凝土单轴压缩下声发射特征试验研究

来源 :城市地下空间与地质灾害防治技术论坛暨第八届江苏省岩土力学与工程学术会议 | 被引量 : 0次 | 上传用户:niitliu
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为了探究泡沫混凝土的单轴压缩下的内部损伤演变规律,对2种不同密度的泡沫混凝土试样进行了单轴受压试验,并利用声发射技术对试验全过程进行了动态监测,获得了表征泡沫混凝土损伤演化过程的典型声发射事件累计数曲线、声发射事件率、能率曲线以及事件定位演化图.结果显示:不同密度泡沫混凝土都要经历压密阶段、弹性阶段、塑性阶段以及峰后破坏阶段.塑性阶段之前声发射事件累计、事件率和能率值都相对很低,而在峰后破坏阶段事件累计、事件率以及能率都急剧增加,且声发射事件率和能率峰值相比应力峰值在时间上具有滞后性.峰值过后2种泡沫混凝土都具有一定的残余强度,继续加载时不断产生新的裂纹,表现为较多的小能率事件发生.破坏模式分析表明裂纹主要是从泡沫混凝土两端产生、发展并最终贯通整个试样,属于典型的张拉破坏.
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