發(fā)布時(shí)間：2018-10-18 20:23

【摘要】：隧洞在施工過程中,必將導(dǎo)致地下水滲流場(chǎng)的重分布和地下水位線的降低,當(dāng)前常用的滲流量計(jì)算解析方法未考慮水位降低這一影響。首先通過數(shù)值計(jì)算方法分析隧洞開挖帶來的滲流場(chǎng)變化,考慮地下水位線降低對(duì)滲流量的影響,提出分別計(jì)算隧洞滲流場(chǎng)穩(wěn)定后開挖降低水位和滲流量的解析公式。結(jié)果表明:隧洞開挖過程中,洞周孔壓和地下水浸潤(rùn)面隨時(shí)間逐漸降低,在距離隧洞5倍洞徑范圍內(nèi)孔壓變化劇烈,地下水位線浸潤(rùn)面降低幅度達(dá)到26.3%~56.7%;滲流場(chǎng)穩(wěn)定后地下水位線降低高度與隧洞半徑和初始地下水位密切相關(guān),與圍巖滲透系數(shù)關(guān)系不大;經(jīng)過與傳統(tǒng)解析解和數(shù)值解的對(duì)比可以看出,提出的解析公式能夠方便求解隧洞開挖降低水位和滲流量,且同時(shí)適用于初始地下水位線水平分布和傾斜分布條件。
[Abstract]:In the process of tunnel construction, the redistribution of groundwater seepage field and the decrease of underground water level are bound to be caused. The influence of water level reduction is not taken into account in the current analytical method of seepage discharge calculation. Firstly, the variation of seepage field caused by tunnel excavation is analyzed by numerical calculation method. Considering the influence of underground water level reduction on seepage flow, an analytical formula is proposed to calculate the water level and seepage flow after tunnel seepage field is stabilized respectively. The results show that during the excavation of the tunnel, the pore pressure and the groundwater infiltration surface decrease gradually with time, and the pore pressure changes dramatically in the range of 5 times the diameter of the tunnel. The depth of underground water level decreases by 26.3 and 56.7.The decrease of groundwater level is closely related to tunnel radius and initial groundwater level, but has little to do with the permeability coefficient of surrounding rock. By comparing with the traditional analytical solution and numerical solution, it can be seen that the proposed analytical formula can easily solve the tunnel excavation to reduce the water level and seepage discharge, and is suitable for the initial horizontal and inclined distribution of underground water level at the same time.
【作者單位】： 武漢大學(xué)水資源與水電工程科學(xué)國(guó)家重點(diǎn)實(shí)驗(yàn)室;長(zhǎng)江勘測(cè)規(guī)劃設(shè)計(jì)研究有限責(zé)任公司;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(51179140,51579194)~~
【分類號(hào)】：U452.11

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本文編號(hào)：2280269