含砂量对黄原胶复合黏性土抗裂和抗冲刷性能的影响

为增强黏性土的抗裂和抗冲刷性能，对掺加不同含量砂土的黄原胶复合黏性土开展了一系列室内蒸发、干缩开裂和抗冲刷试验，通过测算试样含水率和土体抗冲刷系数，结合图形分析软件定量分析了土体表层裂隙的发育情况，以研究复合黏性土体内部水分变化规律及其抗裂和抗冲刷性能。结果表明：随着黏性土中砂土颗粒的掺入，试样的裂隙率、裂隙宽度和受冲刷破坏程度呈现先增大后减小的趋势；当含砂量为30%时，素土及黄原胶复合试样的裂隙率、裂隙宽度和受冲刷破坏程度均为各含砂量下的最大值；当含砂量为50%左右时，对于黄原胶复合黏性土，黄原胶胶体与砂土颗粒形成具有一定强度的稳定结构，其抗冲刷性能得到显著提高。

Effect of sand content on anti-crack and anti-scour property of xanthan gum composite silty clay

In order to enhance the anti-crack and anti-scour property of cohesive clay, a series of evaporation, dry shrinkage cracking and anti-scour tests were carried out on xanthan gum composite cohesive clay mixed with sand of different contents. By measuring the moisture content of the sample and anti-scour coefficient of the soil, and quantitatively analyzing the development of surface crack of the soil with graphic analysis software, the internal water change law, anti-crack and anti-scour performance of the composite cohesive soil were studied. The results show that, with the addition of sand particles, the crack rate, crack width and scour damage degree of cohesive clay samples increase first and then decrease. When the sand content is 30%, the crack rate, crack width and scour damage degree of cohesive clay samples with or without xanthan gum are higher than those of other sand contents. When the sand content is about 50%, the xanthan gum colloid forms a stable structure with a certain strength with sand particles for xanthan gum composite silty clay, and its anti-scour performance is significantly improved.