【摘要】：依托霍永高速公路隧道工程實(shí)例，借助地質(zhì)雷達(dá)探測和開挖驗(yàn)證的手段研究了溶洞在雷達(dá)探測圖像上的特征反射。通過對地下工程圍巖理論、地下工程圍巖穩(wěn)定性分級方法、巖溶洞穴穩(wěn)定性評價(jià)、地質(zhì)雷達(dá)探測原理、隧道溶洞處置原則等現(xiàn)有資料的研究，并利用數(shù)值模擬的方法分析了巖溶洞穴所處位置對隧道圍巖穩(wěn)定性的影響規(guī)律。結(jié)合現(xiàn)場監(jiān)控量測手段，研究注漿處理后隧道周邊圍巖穩(wěn)定性的改善效果。得到一些直接應(yīng)用于工程實(shí)踐或供理論參考的研究成果。主要研究內(nèi)容如下： （1）地質(zhì)雷達(dá)在探測隧道圍巖溶洞時，相應(yīng)頻率的天線和適當(dāng)?shù)膬x器參數(shù)設(shè)置，在探測隧道周邊溶洞時進(jìn)行合理的測線布置，，巖溶和深溝區(qū)域在雷達(dá)波形上的呈現(xiàn)特點(diǎn)和反射特征，以及對雷達(dá)探測結(jié)果的驗(yàn)證。 （2）根據(jù)巖溶洞穴穩(wěn)定性評價(jià)方法，應(yīng)用有限元分析手段，模擬溶洞在隧道底板下方，拱頂正上方，隧道右邊墻側(cè)方時隧道周邊圍巖的位移和隧道襯砌的受力情況。并改變?nèi)芏磁c隧道襯砌的垂直距離，溶洞半徑，分析隧道周邊圍巖位移和襯砌受力變化。依據(jù)地下工程圍巖散體壓力理論和圍巖共同作用理論，分析圍巖位移變化和襯砌受力變化的原因。 （3）依據(jù)隧道溶洞處理原則并參照以往工程實(shí)例，討論該工程條件下處理隧道周邊溶洞的方案，采用監(jiān)控量測手段驗(yàn)證溶洞處理后的效果，并分析采用該加固方案對巖溶區(qū)域的作用機(jī)理。
[Abstract]:Based on the tunnel engineering example of Huo-yong Expressway, the characteristic reflection of karst cave on radar detection image is studied by means of geological radar detection and excavation verification. Based on the study of the existing data such as the theory of underground engineering surrounding rock, the classification method of surrounding rock stability of underground engineering, the evaluation of karst cave stability, the principle of geological radar detection, and the principle of tunnel cavern disposal, etc. The influence of the location of karst cave on the stability of tunnel surrounding rock is analyzed by numerical simulation. Combined with field monitoring and measurement, the improvement effect of surrounding rock stability of tunnel after grouting treatment is studied. Some research results which are directly applied in engineering practice or for theoretical reference are obtained. The main research contents are as follows: (1) the antenna of the corresponding frequency and the appropriate instrument parameters are set when the geological radar detects the surrounding rock caverns of the tunnel, and the reasonable arrangement of the measuring lines is carried out in the detection of the surrounding caverns of the tunnel. The features and reflection characteristics of radar waveforms in karst and deep gully areas, as well as the verification of radar detection results. (2) according to the evaluation method of karst cave stability, the displacement of surrounding rock and the force of tunnel lining are simulated when the karst cave is under the tunnel floor, the arch top is directly above, and the right side of the tunnel wall. The vertical distance between the tunnel and the tunnel lining and the radius of the cavern are changed to analyze the displacement of surrounding rock around the tunnel and the change of the lining force. Based on the theory of pressure of surrounding rock in underground engineering and the theory of joint action of surrounding rock, the reasons for the change of displacement of surrounding rock and the stress change of lining are analyzed. (3) according to the principle of tunnel cavern treatment and referring to the previous engineering examples, the scheme of treating the surrounding karst cave in the tunnel is discussed, and the effect of karst cave treatment is verified by means of monitoring and measurement. The action mechanism of this reinforcement scheme on karst area is analyzed.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U451.2

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