LI Zhen, PENG Hua, MA Xiumin, JIANG Jingjie, SUN Yao. 2018: PALEOCHANNELS AND ENGINEERING GEOLOGICAL EVALUATION ALONG QIONGZHOU STRAIT. JOURNAL OF ENGINEERING GEOLOGY, 26(4): 1017-1024. DOI: 10.13544/j.cnki.jeg.2017-402
    Citation: LI Zhen, PENG Hua, MA Xiumin, JIANG Jingjie, SUN Yao. 2018: PALEOCHANNELS AND ENGINEERING GEOLOGICAL EVALUATION ALONG QIONGZHOU STRAIT. JOURNAL OF ENGINEERING GEOLOGY, 26(4): 1017-1024. DOI: 10.13544/j.cnki.jeg.2017-402

    PALEOCHANNELS AND ENGINEERING GEOLOGICAL EVALUATION ALONG QIONGZHOU STRAIT

    • The geological hazards investigation is carried out, with the application of the single channel seismic detection technology, to evaluate the stability of the Qiongzhou strait cross-sea corridor engineering. Two paleochannels are found between the seismic reflection layers I and Ⅲ. They are along the both bank slopes of the present trough. The northern one lies on the bank slopes from the Dengloujiao Cape to the Haian Port. It has an arc-shaped geometry around the southwest basalt platform of the Leizhou Peninsula. The other is from the Lingao Cape to the Dongshui Port. According to the regional geological data, they both have a relatively late chronological characteristic. The northern one is at least later than the Middle Pleistocene, and the other may be Holocene. The geometric characteristic analysis shows their asymmetric "U" geometric feature. They are steep in the south side and gentle in the north. According to the drilling data, their filling has the deposition characteristics of mutual layer of soft soil and sand. Therefore, it is easy to trigger geological disasters including bedding collapse, sand liquefaction and soft soil seismic subsidence, due to the combined action of external forces such as earthquakes, waves and tidal currents and major engineering construction. Their geological conditions and stability can be one of the geological problems unable to evade and must be solved in the Qiongzhou strait cross-sea corridor engineering.
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