盾构掘进与干渠渗漏耦合作用下干渠变形规律
任磊 , 王晓睿 , 景来红 , 孟旭央 , 杨捷 , 张华青
地球科学 ›› 2025, Vol. 50 ›› Issue (06) : 2387 -2399.
盾构掘进与干渠渗漏耦合作用下干渠变形规律
Deformation Law of the Main Canal Bottom Plate under Coupling Effect of Main Canal Leakage and Shield Tunneling
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盾构下穿南水北调干渠时,在渠底结构渗漏条件下,将造成更为严重的危害,因此为研究在双向作用耦合作用下的扰动变形规律,采用FEFLOW软件模拟渠道不同渗漏工况时地下水渗流影响范围,利用FLAC3D软件建立干渠-地层-隧道模型,进行不同施工工况的协同变形数值模拟.研究表明:当渠道局部渗漏量接近或大于100 m3/d时,渗漏的平面影响范围大于100 m,在垂直方向上渠道渗漏中心至隧洞顶板的地层由包气带转化为饱水带,该地层从不饱和状态转变为饱和状态;正常工况与渗漏工况模拟结果对比,渠底变形曲线形态分别为“W型”和“V型”,最大沉降量为3.6 mm和6.4 mm,沉降槽宽度分别为27 m和45 m.表明渠底渗漏将使得渠底变形沉降槽深度增大,是由于渠底渗漏使得影响范围内土层强度降低、压缩系数改变,饱和土层需产生更大变形抵消应力变化.
When a shield tunnel passes under the main canal of the South-to-North Water Diversion Project, leakage at the bottom of the canal structure can lead to more severe hazards. Therefore, to study the disturbance deformation patterns under the coupling effects of bidirectional interactions, the FEFLOW software was used to simulate the influence range of groundwater seepage under different leakage conditions in the canal. The FLAC3D software was employed to establish a model of the canal-stratum-tunnel system, and numerical simulations of cooperative deformation under different construction conditions were conducted. The study shows that when the local leakage volume in the canal approaches or exceeds 100 m³/day, the planar influence range of the leakage exceeds 100 m. In the vertical direction, the stratum from the leakage center to the tunnel roof transitions from the vadose zone to the saturated zone, changing from an unsaturated to a saturated state. Comparing the simulation results of normal conditions with leakage conditions, the deformation curves at the canal bottom exhibit “W-shaped” and “V-shaped” patterns, respectively, with maximum settlements of 3.6 mm and 6.4 mm, and settlement trough widths of 27 m and 45 m. The results indicate that leakage at the canal bottom increases the depth of the settlement trough. This is because the leakage reduces the soil strength and alters the compression coefficient within the affected range, requiring greater deformation in the saturated soil layer to counteract stress changes.
南水北调工程 / 盾构隧道 / 渠道变形 / 数值模拟 / 工程地质.
South-to-North Water Diversion project / shield tunnel / channel deformation / numerical simulation / engineering geology
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国家自然科学基金青年项目(51309100)
2023年河南省重点研发项目(241111321300)
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