發(fā)布時間：2019-05-08 08:17

【摘要】：鉆孔壓水試驗所得到透水率及滲透系數(shù)僅限于半無限域巖體,若條形域防滲墻鉆孔壓水試驗仍沿用半無限域公式計算其滲流參數(shù)顯然不合適。針對防滲墻幾何形狀和鉆孔壓水試驗原理,在基于穩(wěn)定流承壓完整井的滲流場條件下,采用復(fù)變函數(shù)方法將條形域中井流問題變換到半無限域中,再代入直線補給邊界穩(wěn)定流承壓完整井流公式求解,從而導(dǎo)出條形域防滲墻上鉆孔壓水試驗滲流參數(shù)求解表達式。提出對條形域與半無限域流量比Q'/Q和滲透系數(shù)比k'/k進行分析,討論防滲墻與鉆孔幾何尺寸L/r_0,r_0對其影響;當取L/r_0104.7,r_075 mm,k'=k或Q'=Q時,得出條形域流量Q'和透水率q'均大于半無限域,即Q'Q,q'q,而滲透系數(shù)k'k。根據(jù)條形域與防滲墻兩側(cè)的補給邊界情況,給出防滲墻鉆孔壓水試驗滲流流量表達式使用條件。經(jīng)工程實例驗證,在土體與墻體滲透系數(shù)比k_1/k_2100時按提出的計算方法與芯樣室內(nèi)滲透試驗結(jié)果基本一致。該研究方法還可將鉆孔壓水試驗推廣到其他形狀有限域滲流參數(shù)求解中。
[Abstract]:The water permeability and permeability coefficient obtained by drilling water compression test are limited to the rock mass in semi-infinite domain. It is obviously not suitable to calculate seepage parameters by using semi-infinite domain formula in drilling water pressure test of diaphragm wall in strip region. In view of the geometric shape of impervious wall and the principle of drilling pressure water test, under the condition of seepage field based on steady flow bearing pressure complete well, the problem of well flow in strip domain is transformed into semi-infinite domain by means of complex variable function method. Then the integral well flow formula of steady flow bearing pressure on the recharge boundary of straight line is solved, and the solution expression of seepage parameters in the borehole pressure water test on the cut-off wall in strip region is derived. The flow ratio Q / Q and permeability ratio k / k in strip-to-semi-infinite region are analyzed, and the influence of impervious wall and bore hole geometry size L ~ (?) _ r ~ (0) and r ~ (0) on it is discussed. When L = 0104.7, r = 075 mm,k'=k or Q / Q, the flow rate Q 'and water permeability Q' in strip domain are larger than those in semi-infinite domain, I. E., Q Q, Q Q, and the permeability coefficient k'is higher than that in the semi-infinite region, that is, Q Q, Q Q, and the permeability coefficient k'is higher than that of Q Q. According to the condition of supply boundary between strip region and both sides of impervious wall, the condition of using the expression of seepage flow rate in drilling and pressing water test of impervious wall is given. It is verified by engineering example that the calculation method is basically consistent with the indoor permeability test results of core sample when the permeability coefficient ratio of soil to wall is 1 / 2100. The method can also be extended to solve the seepage parameters in other finite regions.
【作者單位】： 南京大學(xué)地球科學(xué)與工程學(xué)院;安徽水利水電職業(yè)技術(shù)學(xué)院;
【分類號】：O357.3

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