CAJ | 학술논문

研究了3种初始含水率疏浚淤泥添加不同比例生石灰,经不同时长的闷料期,其击实土的强度及变形变化规律.试验结果表明:击实生石灰淤泥材料化土的无侧限抗压强度随闷料期增大而增大,且强度增加速率和掺灰比有关,掺灰比越大,强度增加速率越大.对应不同初始含水率的疏浚淤泥,掺灰比存在临界点,该临界点是生石灰淤泥材料化土应力应变关系由塑性向脆性转化的转折点.小于该掺灰比,生石灰淤泥材料化土单轴压缩下是理想弹塑性变形,大于该掺灰比,击实生石灰淤泥材料化土是脆性破坏变形.对于小于临界掺灰比的生石灰淤泥材料化土,延长闷料期,其击实土应力应变关系有由塑性向脆性转化的趋势,但是改良效果缓慢;对于大于临界掺灰比的生石灰淤泥材料化土,延长闷料期,其击实土的强度有显著提高.实际工程中如果场地条件及工期允许,可以通过延长闷料期改善土性,从而减小掺灰比,以节省工程造价.
연구료3충초시함수솔소준어니첨가불동비례생석회,경불동시장적민료기,기격실토적강도급변형변화규률.시험결과표명:격실생석회어니재료화토적무측한항압강도수민료기증대이증대,차강도증가속솔화참회비유관,참회비월대,강도증가속솔월대.대응불동초시함수솔적소준어니,참회비존재림계점,해림계점시생석회어니재료화토응력응변관계유소성향취성전화적전절점.소우해참회비,생석회어니재료화토단축압축하시이상탄소성변형,대우해참회비,격실생석회어니재료화토시취성파배변형.대우소우림계참회비적생석회어니재료화토,연장민료기,기격실토응력응변관계유유소성향취성전화적추세,단시개량효과완만;대우대우림계참회비적생석회어니재료화토,연장민료기,기격실토적강도유현저제고.실제공정중여과장지조건급공기윤허,가이통과연장민료기개선토성,종이감소참회비,이절성공정조개.
The strength and deformation variation rules of the filling soils improved from 3 kinds of high-water-content dredged sludge with lime treated with different initial water contents and delay time were studied. The experimental results indicate that the unconfined compressive strength of the compacted soil increases with the increase of the delay time. The increase rate relates to the lime content. The larger the lime content, the higher the increase rate of the unconfined compressive strength. As for the dredged sludge with different initial water contents, there is a critical lime content for the mixing proportion, which is the turning point of the soil from the stress-strain relationship to the plastic-brittle one. The soil with a mixing proportion smaller than the critical lime content under the uniaxial compression deformation exhibits ideal elastic-plastic deformation, and the compacted soil with a mixing proportion larger than the critical lime content exhibits brittle failure deformation. As for the former, if the delay time extends, the stress-strain relationship of the compacted soil will show a tendency from plasticity to brittleness and have slow conversion efficiency. As for the latter, if the delay time extends, the strength of the compacted soil will have a significant increase. In the engineering practices, if the site conditions and the construction period are allowable, the delay time should be extended so as to improve the soil properties and to reduce the lime content and to save project cost.