發(fā)布時(shí)間：2018-06-22 16:10

  本文選題：隧道工程 + 巖溶��； 參考：《重慶大學(xué)》2016年碩士論文

【摘要】：在山嶺隧道施工過(guò)程中,受地下水影響的隧道圍巖穩(wěn)定性變化以及突水、突泥等問(wèn)題一直困擾著工程界。在巖溶富水地區(qū)修建隧道時(shí),由于地下水的存在,使隧道圍巖穩(wěn)定性變化規(guī)律及地下水涌水量的預(yù)測(cè)問(wèn)題變的更為復(fù)雜,如果不能有效預(yù)測(cè)、控制地下水,則發(fā)生突水等災(zāi)害事故的可能性增大,進(jìn)而影響到工程的順利施工,甚至危及到人的生命、財(cái)產(chǎn)安全。因此,針對(duì)巖溶富水隧道地質(zhì)災(zāi)害復(fù)雜的特點(diǎn),開(kāi)展隧道施工過(guò)程中應(yīng)力場(chǎng)、滲流場(chǎng)、位移場(chǎng)之間的多場(chǎng)耦合問(wèn)題研究,提出隧道涌水量預(yù)測(cè)方法,對(duì)巖溶隧道的安全施工是很有必要的。本文以巖溶富水隧道現(xiàn)場(chǎng)監(jiān)控量測(cè)、水文觀測(cè)為依托,采用理論分析、現(xiàn)場(chǎng)試驗(yàn)和監(jiān)測(cè)、數(shù)值模擬相結(jié)合的方法,分析了地下滲流場(chǎng)變化對(duì)圍巖應(yīng)力場(chǎng)和位移場(chǎng)的作用機(jī)理,研究了應(yīng)力場(chǎng)、位移場(chǎng)和滲流場(chǎng)多場(chǎng)耦合數(shù)學(xué)模型,研究了巖溶富水隧道的滲流場(chǎng)、應(yīng)力場(chǎng)、位移場(chǎng)之間的相互作用規(guī)律,在多場(chǎng)耦合的基礎(chǔ)上提出了巖溶隧道最大涌水量的計(jì)算方法,并以實(shí)際在建隧道為工程背景,進(jìn)行了多種理論方法的涌水量預(yù)測(cè),并與施工過(guò)程中實(shí)際監(jiān)測(cè)涌水量對(duì)比,得出涌水量預(yù)測(cè)方法的準(zhǔn)確性。并采用地質(zhì)雷達(dá)進(jìn)行現(xiàn)場(chǎng)試驗(yàn),獲得了滲流水影響下隧道圍巖松動(dòng)圈發(fā)育范圍,驗(yàn)證了數(shù)值模擬結(jié)果的有效性。本文主要的研究成果如下:(1)在理論分析基礎(chǔ)上,通過(guò)三泉隧道工程實(shí)例進(jìn)行了水均衡法、地下徑流模數(shù)法以及泉流量匯總法進(jìn)行了涌水量的預(yù)測(cè),根據(jù)隧道施工過(guò)程中涌水量實(shí)際監(jiān)測(cè)結(jié)果,進(jìn)行各分區(qū)涌水量預(yù)測(cè)的準(zhǔn)確率分析,結(jié)果表明在地下水補(bǔ)給明確時(shí),使用地下徑流模數(shù)法預(yù)測(cè)巖溶隧道的涌水量的準(zhǔn)確度最高,水均衡法次之。同時(shí)降雨量和涌水量之間的關(guān)系表明隧道主要水源補(bǔ)給靠大氣降雨,證明了地下徑流模數(shù)法和水均衡法在巖溶富水隧道涌水量預(yù)測(cè)的可行性與可靠性。根據(jù)工程實(shí)例分析了巖溶地區(qū)富水隧道在遇到大型垂向巖溶管道涌水時(shí)的處理方案,給類似地質(zhì)條件的隧道工程的建設(shè)提供一定的借鑒和參考。(2)通過(guò)工程現(xiàn)場(chǎng)試驗(yàn),選取典型斷面進(jìn)行了監(jiān)測(cè),結(jié)果表明:受地下水的影響會(huì)引起應(yīng)力場(chǎng)以及巖體強(qiáng)度的變化。不同地下水條件下,受地下水滲流影響大的圍巖壓力變化值、圍巖位移值以及松動(dòng)圈范圍均大于受地下水滲流影響小的。因此,在巖溶富水隧道工程中,地下水滲流會(huì)造成應(yīng)力場(chǎng)變化值增加、圍巖位移值增大以及松動(dòng)圈范圍變大的結(jié)果,采用多點(diǎn)位移計(jì)測(cè)量出隧道圍巖松動(dòng)圈的范圍,驗(yàn)證了地質(zhì)雷達(dá)測(cè)量隧道圍巖松動(dòng)圈的準(zhǔn)確性。(3)利用數(shù)值模擬,以三泉隧道工程為背景,研究了多場(chǎng)耦合條件下隧道圍巖應(yīng)力場(chǎng)、位移場(chǎng)以及塑性區(qū)的分布規(guī)律,結(jié)果表明滲流場(chǎng)會(huì)對(duì)圍巖的應(yīng)力、位移以及塑性區(qū)造成明顯的影響,數(shù)值分析的結(jié)果和理論解析以及現(xiàn)場(chǎng)試驗(yàn)研究結(jié)果基本相同,驗(yàn)證了數(shù)值模型的準(zhǔn)確性。
[Abstract]:During the construction of the mountain tunnel, the stability changes of the surrounding rock of the tunnel affected by the groundwater, the water inrush and the mud gushing have been puzzling the engineering field. When the tunnel is built in the karst water rich area, the stability of the tunnel surrounding rock and the prediction of the water inflow of the underground water are more complicated, if the tunnel has been built in the karst water rich area. In order to effectively predict and control the groundwater, the possibility of the occurrence of water inrush and other disaster accidents will increase, which will affect the smooth construction of the project and even endanger the human life and property. Therefore, the multi field coupling problem between the stress field, the seepage field and the displacement field in the tunnel construction is carried out according to the complex characteristics of the geological disasters in the karst water rich tunnel. It is necessary for the safety construction of karst tunnel to be put forward in this paper, which is based on the field monitoring measurement of the karst water rich tunnel and the hydrological observation, using the method of theoretical analysis, field test, monitoring and numerical simulation. The effect of the change of underground seepage field on the stress field and displacement field of the surrounding rock is analyzed. The multi field coupling mathematical model of stress field, displacement field and seepage field is studied. The interaction law of seepage field, stress field and displacement field of karst water rich tunnel is studied. On the basis of multi field coupling, the calculation method of maximum water inrush in karst tunnel is put forward, and many theories are carried out in the engineering background of tunnel construction in practice. The method of water flow prediction, and compared with the actual monitoring of the water inflow in the construction process, the accuracy of the water inflow prediction method is obtained. The field test of geological radar is used to obtain the development range of the surrounding rock loosening circle under the influence of seepage flow, and the validity of the numerical simulation results is verified. The main research results of this paper are as follows: (1) theory On the basis of the analysis, the water balance method, the underground runoff modulus method and the spring flow summary method are used to predict the water inflow through the example of the three spring tunnel engineering. According to the actual monitoring results of the water inflow in the tunnel construction, the accuracy analysis of the water gushing volume prediction is carried out. The results show that when the groundwater recharge is clear, the land is used. The lower runoff modulus method has the highest accuracy for predicting the water inrush in karst tunnels, and the water balance method is the next. The relationship between the rainfall and the water flow indicates that the main water supply is recharged by the atmospheric rainfall, which proves the feasibility and reliability of the groundwater flow modulus method and water balance method in the prediction of the water inflow in the karst water rich tunnel. This paper analyzes the treatment scheme of the water rich tunnel in the karst area when it meets the water gushing of the large vertical karst pipeline, and provides some reference and reference for the construction of tunnel engineering with similar geological conditions. (2) through the field test of the engineering, the typical section is selected to be monitored. The results show that the influence of groundwater will cause the stress field and the strength of the rock mass. Under the conditions of different groundwater, the change values of surrounding rock pressure, the displacement value of the surrounding rock and the scope of the loosening ring are smaller than that of the groundwater seepage. Therefore, in the karst water rich tunnel engineering, the seepage of the groundwater will cause the stress field to increase, the displacement value of the surrounding rock and the scope of the loose circle become larger. As a result, a multi point displacement meter is used to measure the range of loose ring of tunnel surrounding rock, and the accuracy of measuring the loose ring of tunnel surrounding rock is verified by the geological radar. (3) using the numerical simulation, the stress field, the displacement field and the plastic zone distribution law of the tunnel surrounding rock are studied under the multi field coupling condition. The results show the seepage field. The results of the numerical analysis and the theoretical analysis and the results of the field test are basically the same, and the accuracy of the numerical model is verified.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TD742

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