固化流态底泥填筑路堤内土体抗剪强度空间变异特性及其影响  

Characteristics and Influence of Spatial Variability of Shear Strength in Embankment Filled with Cement Solidified Slurry-like Bottom Mud

作　　者：韩超 柏彬 张献蒙 蒋达飞 孙科 刘寅莹 HAN Chao;BAI Bin;ZHANG Xianmeng;JIANG Dafi;SUN Ke;LIU Yinying(State Grid Jiangsu Electric Power Engineering Consulting Co Ltd,Nanjing 210036,China;School of Civil and Hydraulic Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]国网江苏省电力工程咨询有限公司,江苏南京210036 [2]华中科技大学土木与水利工程学院,湖北武汉430074

出　　处：《土木工程与管理学报》2022年第1期88-93,共6页Journal of Civil Engineering and Management

基　　金：国网江苏省电力工程咨询有限公司自主立项科技项目(J202004);国家自然科学基金(51978303)。

摘　　要：在固化流态底泥填筑路堤现场施工过程中,固化流态底泥因其材料性能的不确定性和浇填过程难控制将导致填筑路堤内土体力学指标空间变异性较大。目前鲜有关于现场浇填的固化流态底泥剪切强度空间变异性及其对填筑体稳定性影响的研究报道。鉴于此,本文结合现场试验,探究固化流态底泥填筑体内剪切强度的空间变异性,并结合理论分析方法,评价剪切强度空间变异性对填筑路堤稳定性的影响程度和规律。结果表明:现场浇填的固化流态底泥强度空间变异系数介于0.29~0.33范围内;剪切强度的空间变异性对填筑路堤堤身稳定性具有一定影响;传统水泥土设计方法中"将无侧限抗压强度假定为正态分布并取25%分位值作为设计强度"的做法可能给固化流态底泥填筑路堤带来潜在的安全风险。During the on-site construction process of filling the embankment with solidified fluid bottom mud, the uncertainty of the solidified fluid bottom mud due to the uncertainty of its material properties and the difficult control of the filling process will result in the greater spatial variability of the soil mechanical indicators in the filled embankment. At present, there are few research reports on the spatial variability of the shear strength distribution of solidified fluid sediments poured on-site and its effects on the stability of the compacts. In view of this, this article combines field tests to explore the spatial variability of the shear strength of solidified fluid sediments, and combines theoretical analysis methods to evaluate the effect of strong spatial variability of shear strength on the stability of embankments filled with solidified fluid sediments. The degree and law of influence. The results show that the spatial variation coefficient of the strength of solidified fluid sediments poured on site is in the range of 0.29~0.33. The spatial variability of shear strength has a certain influence on the stability of the embankment body. In the traditional cement-soil design method, “assume the unconfined compressive strength as a normal distribution and take the 25% quantile value as the design strength” approach may bring potential safety risks to the filling of embankments with solidified fluid bottom mud.

关 键 词：底泥 水泥固化 路堤 抗剪强度 空间变异性 稳定性 

分 类 号：TU447[建筑科学—岩土工程]