(1. 中南大學(xué) 地球科學(xué)與信息物理學(xué)院，長沙 410083；
2. 中南大學(xué)有色資源與地質(zhì)災(zāi)害探查湖南省重點實驗室，長沙410083；
3. 湖南繼善高科技有限公司，長沙 410208)
摘 要: 為了實現(xiàn)暴雨型山體滑坡的動態(tài)預(yù)警，基于已有的滑坡成果，在線性時不變理論的框架內(nèi)探討一種預(yù)警方法——電抗閾值法。基于地質(zhì)體地電特性TD阻容模型，在外電場作用下將“滑帶層”動態(tài)含水量？Ws變換為反映大地系統(tǒng)傳輸函數(shù)的“滑帶層”復(fù)阻抗特性？Zs，實現(xiàn)對滑坡隱患體(以“滑帶層”為主)動態(tài)含水量的間接監(jiān)測；基于“莫爾-庫倫”破壞準(zhǔn)則，通過對“滑帶層”平均傾斜角α和現(xiàn)場靜摩擦因數(shù)μ閾值的求證獲得μ的動態(tài)閾值邊界；基于模擬實驗和理論分析，在時域系統(tǒng)中通過頻譜變換將？Ws、？Zs和μ歸一為因果系統(tǒng)函數(shù)，獲得反映暴雨型山體滑坡的理論閾值區(qū)。模擬實驗結(jié)果表明：在外電場激發(fā)下，“滑帶層”動態(tài)含水量？Ws與“滑帶層”復(fù)阻抗？Zs以及現(xiàn)場靜摩擦因數(shù)μ具有鮮明的擬合性，且它們在時間域上均具有閾值特性。使用該方法能將不變系統(tǒng)內(nèi)的多參數(shù)有效擬合，可以為暴雨型山體滑坡閾值報警技術(shù)的研究提供一種可探討的新途徑。
關(guān)鍵字: 暴雨型滑坡；復(fù)阻抗；動態(tài)含水量；靜摩擦因數(shù)；閾值報警
（1. School of Geosciences and Info-Physics, Central South University, Changsha 410083, China;
2. Hunan Key Laboratory of Non-ferrous Resources and Geological Hazard Detection,
Central South University, Changsha 410083, China;
3. Hunan Geo-sun High Technology Limited Company, Changsha 410208, China）
Abstract:In order to realize the dynamic warning for the heavy rainfall landslide, based on the existing landslide theory and within linear time-invariant systems theory framework, a warning way named reactance threshold value method was discussed. The dynamic water content of sliding layer ？Ws is transformed to complex impedance ？Zs which reflects the transmission function of geodetic system based on TD resistance-capacity model under the action of external electric field. Based on Mohr-Coulomb failure criterion, the dynamic threshold boundary of the static friction factor μ is obtained through analyzing the average slope angle and static friction factor μ threshold of the sliding layer. ？Ws, ？Zs and μ are normalized to causal system function through spectrum transformation in timing-domain system, and theory threshold area of heavy rainfall landslides is obtained based on theory analysis. The simulation experimental results show the dynamic water content of sliding layer ？Ws, complex impedance ？Zs and static friction factor μ have distinct fitting feature under the action of external electric field, and the three parameters all have threshold characteristics in time domain. This method can effectively fit multiple parameters in the time invariant system, and it can provide a new negotiated way to dynamic threshold warning technology research of heavy rainfall landslide warning.
Key words: heavy rainfall landslide; complex impedance; dynamic water content; static friction factor; threshold warning
