含水率对重塑淤泥不排水强度性质的影响

通过室内调配不同含水率的重塑淤泥，利用研制的室内微型高精度十字板剪切仪，研究了含水率对重塑淤泥重塑不排水强度的影响。该仪器的剪切强度分辨率为1 Pa，经试验验证，仪器测量结果的稳定性较好，但对强度越低的重塑淤泥试样其测量值的相对平均偏差越大。淤泥含水率对淤泥的不排水强度有显著影响，不排水强度均随含水率/液限的增大而减小，含水率/液限越大，不排水强度下降趋势越小。相同的含水率/液限时，不同种类的重塑淤泥的不排水强度比较接近。在双对数坐标中，不排水强度均随含水率/液限的增大而线性减小。由试验数据得出了不同种类重塑淤泥的不排水强度与含水率/液限之间的关系式，利用该关系式可以求得每一种重塑淤泥任意含水率下的不排水强度。文中的试验值大于洪振舜提出的关系式的计算值。当IL >2时，试验值与Locat和Leroueil提出的关系式的计算值基本吻合，当IL <2时，试验值大于Locat和Leroueil提出的关系式的计算值。

Influences of water content on undrained shear strength of remolded dredged materials

Through preparing different water contents remolded dredged material,the influences of water content on the undrained shear strength of remolded dredged material by laboratory miniature high-precision shear vane apparatus are studied.The precision of the apparatus is 1 Pa.The experimental results show that the measured data are reasonable.But,the lower the shear strength of remolded dredged material is,the bigger the relative average deviation of the experimental results is.Test results show that the influences of water content on the undrained shear strength of remolded dredged material are obvious.Undrained shear strength decreases with increasing the ratio of water content to liquid limit(w/wL).The bigger w/wL is,the smaller is downtrend of undrained shear strength.When w/wL is the same,undrained shear strength of remolded dredged material is almost the same.Undrained shear strength linearly decreases with the increase in w/wLin the bilogarithmic plot.Relation between undrained shear strength and w/wLfor all kinds of remolded dredged material is derived,undrained shear strengths of all kinds of water contents for all kinds of remolded dredged materials are derived by this relation.The test results of this paper are bigger than the calculated values of relation by Hong Zhen-shun.The test results are consistent with the calculated values of relations by Locat and Leroueil when IL>2.The test results are bigger than the calculated values of relations by Locat and Leroueil when IL<2.