摘要
为改良上海地区黏土强度低的工程特性,采用在黏土中添加黄原胶和黄麻纤维的方法,通过无侧限抗压试验,来探究黄原胶含量、黄麻纤维加筋率以及养护龄期对上海黏土无侧限抗压强度特性的影响。试验结果表明:黏土中加入黄原胶和黄麻纤维都能够提高其无侧限抗压强度;随着黄原胶掺量的增大,黏土的抗压强度先增大后减小,过量的黄原胶可能会导致黏土强度降低;随着黄麻纤维加筋率的提高,黏土的抗压强度随之增大,过量地加入黄麻纤维可能会在一定程度上削弱黄麻纤维加筋黏土的效果;当在黏土中同时加入黄原胶和黄麻纤维时,相同养护龄期下,黏土的无侧限抗压强度较单独添加其中1种材料都有不同程度的提高;在本试验研究范围内,当黄原胶含量为2.00%,黄麻纤维加筋率为0.35%时,黏土的抗压强度最高;未经养护土体的抗压强度普遍较低;随着养护龄期的增长,黄原胶和黄麻与黏土接触更为紧密,同时添加剂和水的结合约束了土体的变形,使得黏土的无侧限抗压强度不断提高,其增速逐渐减缓。
In order to improve the engineering properties of low strength clay in Shanghai area, by adopting the method of adding xanthan gum and jute fiber into the clay, the influence of xanthan gum content, jute fiber reinforcement ratio and curing age on the unconfined compressive strength of Shanghai clay is studied by unconfined compression test. The test result shows that(1) the addition of xanthan gum and jute fiber into the clay can increase its unconfined compressive strength;(2) as the amount of xanthan gum increases, the compressive strength of the clay increases at first and then decreases, while excess xanthan gum may lead to the decrease of the clay strength;(3) as the reinforcement rate of jute fiber increases, the compressive strength of the clay increases, while the excessive addition of jute fiber may weaken the effect of jute fiber reinforced clay to some extent;(4) when xanthan gum and jute fiber are simultaneously added into the clay, the unconfined compressive strength of the clay is increased to different extent than the single addition of one of the materials under the same curing age;(5) in the scope of this study, when the xanthan gum content is 2.00% and the jute fiber reinforcement ratio is 0.35%, the compressive strength of clay is the highest;(6) the compressive strength of untreated soil is generally low;(7) as the curing age increases, xanthan gum and jute are more closely contacted with the clay, and the combination of additive and water restricts the deformation of the soil, so that the unconfined compressive strength of the clay is continuously improved, and the growth rate will gradually slow down.
作者
陆韬
璩继立
LU Tao;QU Ji-li(School of Environment and Architecture,University of Shanghai for Science and Technology,Shanghai 200093,China)
出处
《公路交通科技》
CAS
CSCD
北大核心
2020年第3期9-16,23,共9页
Journal of Highway and Transportation Research and Development
关键词
道路工程
无侧限抗压强度
试验研究
黏土
黄原胶
黄麻纤维
加筋率
road engineering
unconfined compressive strength
experimental study
clay
xanthan gum
jute fiber
reinforcement rate
