本文關(guān)鍵詞：聚焦電流法隧道地質(zhì)前探仿真研究　出處：《華中科技大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 隧道超前探測(cè) 直流電阻率法 聚焦電流法 有限元仿真

【摘要】：直流電阻率隧道超前探測(cè)法具有較高的勘探效率、野外操作施工簡單方便等特點(diǎn),在側(cè)向測(cè)井、隧道超前預(yù)報(bào)、礦井勘探、城市地下交通工程中得到了較廣泛的應(yīng)用;但是,直流電阻率法在進(jìn)行隧道超前預(yù)報(bào)時(shí)易受坑道、旁側(cè)干擾的影響,而隨著BEAM系統(tǒng)的出現(xiàn),聚焦電流法吸引了越來越多科研工作者的目光。本文沿用聚焦電流法,應(yīng)用ANSYS軟件對(duì)聚焦電流法的探測(cè)原理、電場(chǎng)分布、電極連接方式、模擬實(shí)驗(yàn)中土箱形狀及位置進(jìn)行仿真研究,并進(jìn)行了供電測(cè)量系統(tǒng)的設(shè)計(jì)以及現(xiàn)場(chǎng)試驗(yàn)。首先對(duì)傳統(tǒng)三極法隧道前探效果進(jìn)行了仿真分析,發(fā)現(xiàn)測(cè)量電位在與異常體距離掌子面相同半徑處并沒有明顯的電阻率異常,說明直流電阻率法對(duì)異常體位置及電性的判斷存在一定的誤差。接著介紹了聚焦電流法的理論基礎(chǔ)與探測(cè)原理,提出一種綜合模式和掃描模式測(cè)量系統(tǒng),并對(duì)聚焦電流法的探測(cè)原理進(jìn)行了仿真分析。其次提出一種供電測(cè)量電極與屏蔽電極的連接方式,將護(hù)盾與滾刀測(cè)量電極之間以一個(gè)小電阻r相連接,采用經(jīng)護(hù)盾向滾刀供電測(cè)量電極供電的方式,這樣既能保證屏蔽電極與測(cè)量電極電位的相等,又避免了屏蔽電極電壓的反饋控制,并通過仿真模擬的方法驗(yàn)證了該測(cè)量方式對(duì)異常體定性判斷的可行性。然后對(duì)聚焦電流法土槽模擬實(shí)驗(yàn)中土槽的形狀及位置進(jìn)行仿真研究,一共選取球形、圓柱形、圓錐臺(tái)形三種不同形狀并且不同位置的模擬土槽與無限遠(yuǎn)地質(zhì)條件下的模型進(jìn)行比較,最后得出圓錐臺(tái)形土箱并且中心位置按一定條件偏移的土箱形狀可以較大限度的接近無限遠(yuǎn)地電條件電場(chǎng)分布,并且易于加工。最后,設(shè)計(jì)了一個(gè)完整的測(cè)量系統(tǒng),該系統(tǒng)由變頻信號(hào)產(chǎn)生模塊、恒流驅(qū)動(dòng)模塊、微機(jī)系統(tǒng)、數(shù)據(jù)采集模塊構(gòu)成,并在實(shí)驗(yàn)室環(huán)境、武漢機(jī)場(chǎng)、西安引漢濟(jì)渭等項(xiàng)目中進(jìn)行了測(cè)試。
[Abstract]:DC resistivity tunnel advance detection method has the characteristics of high exploration efficiency, simple and convenient field operation, and so on. It can be used in lateral logging, tunnel advance prediction and mine exploration. Urban underground traffic engineering has been widely used; However, the DC resistivity method is easy to be affected by tunnel and side interference in tunnel advance prediction, and along with the emergence of BEAM system. Focusing current method has attracted more and more researchers' attention. In this paper, the detection principle, electric field distribution and electrode connection mode of focusing current method are studied by ANSYS software. In the simulation experiment, the shape and position of the earth box were simulated, and the design of the power supply measurement system and the field test were carried out. Firstly, the simulation analysis of the traditional three-pole method tunnel before detection effect was carried out. It is found that there is no obvious resistivity anomaly at the same radius between the measured potential and the anomalous body from the palm surface. It shows that the DC resistivity method has some errors in judging the position and electrical property of abnormal body. Then the theoretical basis and detection principle of the focusing current method are introduced and a comprehensive mode and scanning mode measurement system is proposed. The detection principle of focusing current method is simulated and analyzed. Secondly, a kind of connection mode between the power supply measuring electrode and the shield electrode is proposed. The shield is connected with the hob measuring electrode with a small resistance r. The shield is used to supply the measuring electrode to the hob, which can not only guarantee the equivalence between the shield electrode and the measured electrode potential, but also avoid the feedback control of the shield electrode voltage. The feasibility of the method is verified by simulation. Then, the shape and position of the earth trough are simulated in the focused current method, and the spherical shape is selected. Three kinds of simulated soil grooves with different shapes and different positions are compared with the models under infinite geological conditions. Finally, it is concluded that the shape of the earth box with conical platform shape and center position shifting according to certain conditions can be close to infinite electric field distribution, and is easy to process. A complete measurement system is designed. The system is composed of frequency conversion signal generation module, constant current driving module, microcomputer system, data acquisition module, and in the laboratory environment, Wuhan Airport. Xi'an introduced Han to Wei and other projects were tested.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P631.3;U452.1

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