本文選題：水壓率 + 水土統(tǒng)一算法�。� 參考：《江西理工大學(xué)》2017年碩士論文

【摘要】：江西尋烏縣的離子型稀土礦體為屬于粉土,是介于砂性土和黏性土之間的一種過渡性土,研究該類礦體的抗剪強度計算方法,對于分析原地浸礦過程的邊坡穩(wěn)定具有重要意義。應(yīng)用水土分合算理論,引入水壓率的概念,從土的微觀層面上分析水對礦體強度的影響,設(shè)計出一種室內(nèi)測定水壓率的試驗裝置,測定不同孔隙比下的水壓率,采用GDS三軸儀測試總應(yīng)力指標(biāo)和有效指標(biāo),分別計算水土合算、水土分算和水土統(tǒng)一算法下稀土礦體的抗剪強度。滲流產(chǎn)生的動水壓力可使弱結(jié)合水可成為自由水,通過測定土體無滲流和滲流穩(wěn)定兩種情況下的液塑限值,基于水壓率與土的塑性指數(shù)的關(guān)系,求出滲流穩(wěn)定時的水壓率增加值,得出滲流穩(wěn)定狀態(tài)下的水壓率值。分析滲流前后尋烏土體的抗剪強度值。運用數(shù)值模擬計算不同強度指標(biāo)下礦體的安全系數(shù),推出原地浸礦時礦體的臨界注液強度。通過上述研究,得出以下結(jié)論:(1)礦體孔隙比越大,水壓率越大;在同等孔隙比下,飽和礦體的抗剪強度隨著水壓率的增大而增大;尋烏稀土礦體的水壓率值為0.90~0.92;,采用水土統(tǒng)一算法計算得到的抗剪強度值與水土分算法的抗剪強度值更接近,與水土合算下的抗剪強度值相差較大。(2)當(dāng)滲流穩(wěn)定且滲流速度為3×10-5cm/s時,滲流使弱結(jié)合水變成自由水從而引起水壓率值增加了0.03,尋烏稀土礦體的水壓率值為0.930~0.945;發(fā)生滲流時,土體的抗剪強度會變小;在同種孔隙比下,滲流以后的土體抗剪強度值略大于滲流前的抗剪強度值。(3)離子型稀土礦體注液范圍增大時,臨界注液強度減小;礦體的邊坡穩(wěn)定性分析應(yīng)采用總應(yīng)力強度指標(biāo)更為安全;在同等注液強度時,注液范圍增大,礦體會在更短的時間內(nèi)發(fā)生滑坡。
[Abstract]:The ionic rare earth orebody in Xunwu County, Jiangxi Province belongs to silt and is a transitional soil between sandy soil and clay soil. It is of great significance to study the calculation method of shear strength of this kind of orebody for analyzing the slope stability during in-situ leaching. Based on the theory of water and soil distribution, the concept of water pressure ratio is introduced, and the influence of water on the strength of ore body is analyzed from the microcosmic level of soil. An indoor test device is designed to measure the water pressure ratio under different porosity ratio. The total stress index and effective index were measured by GDS triaxial instrument, and the shear strength of rare earth orebody was calculated under the calculation of soil and water, and the unified algorithm of soil and water, respectively. The hydrodynamic pressure generated by seepage can make the weakly bound water become free water. By measuring the liquid-plastic limit value of soil without seepage and seepage stability, based on the relationship between hydraulic pressure and plastic index of soil, The increasing value of water pressure rate is obtained when seepage is stable and the value of water pressure rate under seepage stability is obtained. The shear strength of soil before and after seepage is analyzed. The safety factor of ore body under different strength indexes is calculated by numerical simulation, and the critical liquid injection strength of ore body is deduced when ore is leached in situ. Through the above research, the following conclusions can be drawn: the bigger the porosity ratio of ore body, the greater the water pressure ratio, the more the shear strength of saturated ore body increases with the increase of water pressure ratio under the same void ratio. The water pressure ratio of the Xunwu rare earth orebody is 0.90 ~ 0.92, and the shear strength calculated by the unified soil and water calculation method is closer to the shear strength value of the soil and water component algorithm. When the seepage flow is stable and the seepage velocity is 3 脳 10-5cm/s, the weak bound water becomes free water and the water pressure rate increases by 0.03, and the water pressure rate of the Xunwu rare earth ore body is 0.930 ~ 0.945; when seepage occurs, the water pressure ratio of Xunwu rare earth ore body is 0.930 ~ 0.945. Under the same void ratio, the shear strength of the soil after seepage is slightly larger than that before seepage. 3) when the range of liquid injection of ion rare earth ore body increases, the critical liquid injection strength decreases. In the analysis of slope stability of ore body, the total stress intensity index should be used more safely, and when the liquid injection intensity is equal, the scope of liquid injection will increase, and the ore body will landslide in a shorter time.
【學(xué)位授予單位】：江西理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TD854.6;TD865

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