中国科技论文
中國科技論文
중국과기논문
Sciencepaper Online
2014年
5期
574-577
,共4页
石灰岩%高温%加载速率%力学性能
石灰巖%高溫%加載速率%力學性能
석회암%고온%가재속솔%역학성능
limestone%high temperature%loading rate%mechanical property
借助美国 MTS810电液伺服材料试验机和高温炉,对常温和600℃两种温度状态下石灰岩试件进行不同加载速率下的单轴压缩试验,得到石灰岩力学性能随加载速率的变化规律。结果表明:常温时,石灰岩岩样在3×10-4~3×10-3 mm/s 的低应变率范围内,加载速率对峰值应力和弹性模量影响不大,在加载速率为3×10-3~3×10-1 mm/s 的区段内,峰值应力和弹性模量均呈明显上升趋势;600℃时,峰值应力和弹性模量随加载速率增加变化不大。常温时,不同加载速率下石灰岩岩样均为竖向劈裂破坏,且在3×10-3~3×10-1 mm/s 的加载速率区段中,随加载速率的增加,劈裂面逐渐增多;600℃时,石灰岩岩样在不同加载速率下均为剪切破坏。
藉助美國 MTS810電液伺服材料試驗機和高溫爐,對常溫和600℃兩種溫度狀態下石灰巖試件進行不同加載速率下的單軸壓縮試驗,得到石灰巖力學性能隨加載速率的變化規律。結果錶明:常溫時,石灰巖巖樣在3×10-4~3×10-3 mm/s 的低應變率範圍內,加載速率對峰值應力和彈性模量影響不大,在加載速率為3×10-3~3×10-1 mm/s 的區段內,峰值應力和彈性模量均呈明顯上升趨勢;600℃時,峰值應力和彈性模量隨加載速率增加變化不大。常溫時,不同加載速率下石灰巖巖樣均為豎嚮劈裂破壞,且在3×10-3~3×10-1 mm/s 的加載速率區段中,隨加載速率的增加,劈裂麵逐漸增多;600℃時,石灰巖巖樣在不同加載速率下均為剪切破壞。
차조미국 MTS810전액사복재료시험궤화고온로,대상온화600℃량충온도상태하석회암시건진행불동가재속솔하적단축압축시험,득도석회암역학성능수가재속솔적변화규률。결과표명:상온시,석회암암양재3×10-4~3×10-3 mm/s 적저응변솔범위내,가재속솔대봉치응력화탄성모량영향불대,재가재속솔위3×10-3~3×10-1 mm/s 적구단내,봉치응력화탄성모량균정명현상승추세;600℃시,봉치응력화탄성모량수가재속솔증가변화불대。상온시,불동가재속솔하석회암암양균위수향벽렬파배,차재3×10-3~3×10-1 mm/s 적가재속솔구단중,수가재속솔적증가,벽렬면축점증다;600℃시,석회암암양재불동가재속솔하균위전절파배。
The uniaxial compression tests for limestone specimens were carried out at different loading rates at room temperature and 600 ℃ using the Rock Mechanics Servo-controlled Testing System MTS810 and high temperature furnace.The mechanical properties of limestone at varing loading rates were studied.The results show that,the peak strength and elastic modulus of lime-stone changed little at low loading rates from 3×10-4 mm/s to 3×10-3 mm/s,but an increasing trend occurred when loading rate changed from 3×10-3 mm/s to 3×10-1 mm/s at room temperature;the peak strength and elastic modulus changed little with the increase of loading rate at 600 ℃.The failure mode is vertical splitting failure at different loading rates at room tempera-ture,cleavage planes increased gradually as the loading rate changed from 3×10-3 mm/s to 3×10-1 mm/s;at 600 ℃,the failure mode is shear failure at different loading rates.