發(fā)布時(shí)間：2018-05-15 04:17

  本文選題：基坑滲漏 + 流場擬合�。� 參考：《中南大學(xué)學(xué)報(bào)(自然科學(xué)版)》2016年12期

【摘要】：根據(jù)流場擬合原理設(shè)計(jì)一種新型便捷的基坑滲漏檢測系統(tǒng),通過理論分析和模型實(shí)驗(yàn)驗(yàn)證方案的可行性。采用開關(guān)器件MOSFET設(shè)計(jì)發(fā)射橋路,在地下連續(xù)墻兩側(cè)發(fā)射1 Hz雙極性方波形成人工電場;在地下連續(xù)墻一側(cè),采用分布式電極切換裝置和高精度模數(shù)轉(zhuǎn)換芯片ADS1278以及利用Lab VIEW編寫的上位機(jī)軟件組成接收系統(tǒng)接收人工電場中的1 Hz信號(hào);對(duì)接收到的信號(hào)進(jìn)行快速傅里葉變換,提取信號(hào)1,3,5,7等奇次諧波的幅值繪制電勢等位線圖,根據(jù)水流場和電流場的相似可比性,通過分析電勢等位線圖和電流密度分析人工電場特性,從而分析水流場特性,確定基坑滲漏處的位置。研究結(jié)果表明:與其他基坑滲漏探測方法相比,該系統(tǒng)簡單易用,功耗低,能夠快速準(zhǔn)確找到基坑滲漏處的位置。
[Abstract]:According to the principle of flow field fitting, a new and convenient foundation pit leakage detection system is designed. The feasibility of the scheme is verified by theoretical analysis and model experiments. The switch device MOSFET is used to design the emission bridge, which emits 1 Hz bipolar square wave on both sides of the diaphragm wall to form an artificial electric field, and on one side of the underground diaphragm wall, Using distributed electrode switching device, high precision A / D conversion chip ADS1278 and host computer software written by Lab VIEW to receive 1Hz signal in artificial electric field, the received signal is processed by fast Fourier transform. The amplitude of odd-order harmonics such as signal 1 / 3 / 5 / 5 / 7 is extracted to draw the potential allele diagram. According to the comparability of water flow field and current field, the characteristics of artificial electric field are analyzed by analyzing the potential allelic diagram and current density, so as to analyze the characteristics of water flow field. Determine the location of the leakage of the foundation pit. The results show that compared with other methods, the system is easy to use and low power consumption, and can quickly and accurately find the location of the leakage of foundation pit.
【作者單位】： 吉林大學(xué)儀器科學(xué)與電氣工程學(xué)院;
【基金】：國家重大科學(xué)儀器設(shè)備開發(fā)專項(xiàng)項(xiàng)目(2011YQ030133) 科技部2010年度創(chuàng)新方法項(xiàng)目(2010IM031500)~~
【分類號(hào)】：TU753
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本文編號(hào)：1890931