材料参数空间变异性对水泥固化淤泥填筑路堤稳定性影响研究

doi:10.11779/CJGE201811014

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摘要采用水泥固化疏浚淤泥（CSM）作为路堤填料既能有效解决砂石等理想填料资源的短缺难题,又能科学地减轻疏浚淤泥弃置给社会带来的经济和环境压力,值得大力推广。但实际工程中CSM材性参数往往表现出极强的空间变异性,明显影响路堤的稳定性,而常规确定性设计方法（CDDM）对此考虑不足。鉴于此,基于现场CSM材性参数统计特征,通过随机有限元法（RFEM）分析了不同工况下参数空间变异性对CSM路堤稳定性的影响规律,重点比较了RFEM可靠度方法和CDDM在CSM路堤设计中的差异,结果表明CDDM无法合理表征CSM材性参数强空间变异性的影响,设计结果往往偏于危险。最后,以RFEM分析为纽带,提出了CDDM稳定安全系数、路堤设计参数、材料参数变异系数和可靠度指标四者之间的对应关系,有助于实现在不改变CDDM设计架构前提下等效表征CSM材性参数强空间变异性影响的目的。

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关键词 ：水泥固化淤泥, 路堤稳定性, 空间变异性, 随机场, 可靠度指标, 安全系数

Abstract：The application of cement-stabilized mud (CSM) as the filling materials of embankments mitigates the issue of local scarcity of ideal filling materials (e.g., sand and gravel) and allows significant volumes of unwanted mud arising from dredging to be disposed economically and ecologically. Nevertheless, this artificial material tends to show very high spatial variability in engineering properties. The high spatial variability can produce substantial influences on the stability of CSM embankments, but is not well considered in the conventional deterministic design method (CDDM). In this study, the statistical information of the engineering properties of in-situ CSM is first identified, and the random fields characterizing the spatial variability of these properties are generated. Both deterministic and random field numerical simulations are then performed to analyze the stability of a number of typical CSM embankments. Special attention is paid to compare the difference between the CDDM and the random field method. The results show that the effect of spatial variability is significant but not reasonably accounted for in CDDM, very probably leading to unsafe design for CSM embankments. Finally, an empirical formula is proposed to describe the relationship amongst the safety factor of stability in CDDM, the embankment design parameters, the coefficient of variation for CSM strength, and the reliability index. This empirical formula can be adopted to equivalently characterize the influences of spatial variability on the stability of CSM embankments, without changing the framework of CDDM.

Key words： cement-stabilized mud embankment stability spatial variability random field reliability index safety factor

收稿日期: 2017-09-29

ZTFLH:

TU43

通讯作者: *（E-mail: zhengjj@hust.edu.cn）

作者简介: 章荣军(1983- ),男,博士,副教授,主要从事疏浚淤泥固化与再生利用方面的研究工作。E-mail: ce_zhangrj@hust.edu.cn。

引用本文:

章荣军, 于同生, 郑俊杰. 材料参数空间变异性对水泥固化淤泥填筑路堤稳定性影响研究[J]. 岩土工程学报, 2018, 40(11): 2078-2086. ZHANG Rong-jun, YU Tong-sheng, ZHENG Jun-jie. Influences of spatial variability of material properties on stability of embankment filled with cement-stabilized mud. Chinese J. Geot. Eng., 2018, 40(11): 2078-2086.

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http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/10.11779/CJGE201811014 或 http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/Y2018/V40/I11/2078

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