摘要
通过数值模拟对大高度堆载挤淤作用下淤泥层的实际破坏模式进行了分析,并且与现有堆载挤淤深度计算公式原理进行了对比分析。结果表明:当挤淤深度较大时,淤泥层破坏时的塑性区不再贯穿整个淤泥层,而是在淤泥层产生局部剪切破坏,从而导致现有挤淤深度计算公式的结果偏小;当淤泥层厚度相对挤淤深度较小的时候,淤泥层下卧硬层对上覆堆载产生支撑作用,从而导致现有挤淤深度计算公式的结果偏大。考虑到大高度堆载挤淤作用下淤泥层失稳破坏时的实际情况,根据堆载体是否产生急剧位移来确定挤淤深度,提出了应用数值模拟分析确定挤淤深度的方法,并且分析了堆载体容重、淤泥容重、淤泥强度、堆载宽度、淤泥层厚度等因素对挤淤深度的影响规律。将该方法应用于工程实例分析,计算结果与实测数据吻合,验证了该方法的正确性。
The real failure mode of the silt layer by the effect of the big height dumping silt-replacement is analyzed by the numerical simulation, and the comparative analysis with the existed dumping silt-replacement depth computational for- mula principle is carried out. The results show that when the silt-replacement depth is big,the plastic area will no longer run through the whole silt layer, but the partial shear failure will be produced, which will cause the existed silt-replacement depth formula result to be smaller than the real depth; when the silt layer thickness is small with respect to the silt-re- placement depth, the underlying bed will support the dumping,which will cause the existed silt-replacement depth formula result to be bigger than the real depth. Considering the real failure mode of the silt layer by the effect of the big height dumping silt-replacement, by defining the silt-replacement depth based on whether the dumping has emerged shape dis- placement,a method to define the silt-replacement depth by the numerical simulation analysis was presented, and the effect law that how the factors such as dumping bulk density, silt bulk density, silt strength, dumping width and silt layer thickness will affect the silt-replacement depth was analyzed. The calculation results of this method fit well with the meas- ured results when this method is applied to the real engineering analysis,which proves the validity of this method.
出处
《武汉理工大学学报》
CAS
CSCD
北大核心
2014年第3期121-127,共7页
Journal of Wuhan University of Technology
基金
国家自然科学基金面上项目(41372313)
关键词
大高度堆载
挤淤深度
破坏模式
淤泥层厚度
big height dumping
slit-replacement depth
failure mode
silt layer thickness
