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Study on the implementation effect of differential settlement control technology in embankment widening project
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摘要: 针对堤路改造工程中面临的差异沉降控制等难题，以南京市江北新区滨江堤防道路加宽改造工程为依托，根据堤防下部地质条件与工程建设特点选取典型断面进行数值计算模拟，开展天然堆载、台阶开挖联合土工格栅处理和深层水泥搅拌桩（DCM）处理3种方案的分析对比研究。结合数值计算结果，采用上部结合面处置联合下部地基处理的差异沉降控制技术，对软土地基进行深层水泥搅拌桩处理、在新老堤结合处进行台阶开挖联合土工格栅与锥探灌浆等方式相结合的措施进行加固处理。通过现场监测分析断面沉降、孔隙水压力与水平位移等的发展规律，验证数值模型的合理性，并评估该处理方案在实际堤路改造工程中的差异沉降控制效果。结果表明，采用上部结合面处置联合下部地基处理的试验断面路中与右路肩工后剩余沉降分别为16和20 mm，二者差异沉降均保持在4 mm以下。这验证了该技术对堤路改造工程新老堤协调变形的控制效果，可为后续滨江堤路改造工程差异沉降控制提供借鉴。Abstract: The construction of the embankment-road widening project experiences challenges, such as differential settlement control. To handle the difficulties, the computational research was conducted to examine the waterfront embankment-road combination project in Jiangbei District, Nanjing. Based on the geological and engineering features, the research was carried out to investigate the three working conditions, known as the natural pile load, step excavation combined with geogrid treatment, and deep cement mixing (DCM) pile treatment. According to the quantitative results, a combination of cement-soil mixing pilecone and probe grouting and geogrid treatment, as well as the step excavation treatment, was used at the stage of the combination of old and new embankments based on data analysis so that the differential settlement could be controlled. The reasonableness of the numerical model was verified by carrying out field monitoring work at the typical section and analyzing the settlement, pore water pressure, and horizontal displacement indexes. Additionally, the actual differential settlement control effect of this design scheme in the embankment-road combination project was evaluated. The results show that the remaining settlement after work in the middle and right shoulders under this design scheme is 16 and 20 mm, respectively, and the differential settlement of the two is below 4 mm. The research indicates that this technique is effective for the coordinated deformation control of the old and new embankments in the project. The approach can guide further treatments of soft soil roadbeds in subsequent riverbank road combination projects.
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图 2 数值模拟特征点与DCM方案网格划分
Figure 2. Feature points of numerical simulation and DCM condition meshing
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图 3 路面范围下原地表沉降对比
Figure 3. Comparison of in-situ surface settlements under the pavement range
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图 4 断面工后沉降分布
Figure 4. Distribution of post-construction settlement in the cross section
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图 6 3种工况下最终水平位移云图
Figure 6. Final horizontal displacement nephogram for three working conditions
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图 7 新老路堤结合面处理方案
Figure 7. Treatment scheme of the joint surface of the old and new embankments
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图 10 软土层中心位置孔压变化
Figure 10. Change of pore pressure at the center position of soft soil layer
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图 11 孔压数值计算与监测数据对比
Figure 11. Comparison of hole pressure numerical calculation and monitoring data
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图 13 地表沉降模拟与监测结果对比
Figure 13. Comparison of surface subsidence simulation and monitoring results
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图 15 水平位移数值计算与监测数据对比
Figure 15. Comparison of horizontal displacement numerical calculation and monitoring data
表 1 3种处理方案下的数值模型对比
Table 1 Comparison of numerical models under three schemes
处理方法 设计方案 研究重点 天然堆载 单纯路堤堆载预压处理 新老堤堤身、路基和结合部位的沉降变形规律 台阶加筋 使用开挖台阶结合土工加筋处理新旧路堤结合面，
同时利用路堤堆载对地基进行预压处理新老堤的沉降变形规律、结合部位的变形规律和土工织物的
力学变形特性DCM处理 采用深层水泥搅拌桩（deep cement mixing pile）复合地基法进行地基
处理，在新旧堤结合段采用变桩长进行过渡，并在新旧路堤结合面
采用台阶开挖结合土工加筋处理新老堤的沉降变形规律、新老堤结合部位的变形规律和
复合地基的变形规律
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表 2 数值模型参数
Table 2 Parameters of numerical models
材料 孔隙比 渗透系数/(cm·s−1) 天然重度/(kN·m−3) 弹性模量/kPa 黏聚力/kPa 内摩擦角/° 泊松比 ①-2素填土 0.907 1.00×10−5 18.9 2 680 16 18 0.35 ②-1粉质黏土、黏土 0.881 1.00×10−5 19.0 2 460 15 16 0.38 ②-2淤泥质粉质黏土、淤泥质黏土 1.019 7.57×10−6 18.2 1 200 14 12 0.44 ②-3粉土 0.769 1.00×10−4 19.3 5 380 10 18 0.32 ③-1粉砂 0.619 1.40×10−3 20.1 7 580 27 0.30 新路堤填土 0.500 1.00×10−5 21.2 12 900 50 18 0.35 路面结构 24.0 10 000 000 0.20 褥垫层 0.500 1.00×10−5 21.5 20 000 100 20 0.30 加筋 1 750 000 0.20 实际水泥土桩 0.500 1.00×10−7 21.0 150 000 200 30 0.25 二维等效水泥土桩 0.500 1.00×10−7 21.0 56 000 200 30 0.25
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