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1991年に開始した中国西安市驪山地すべりの予測のための日中共同研究の成果を概観する。華清池後背斜面は大規模潜在地すべりである可能性があり、この斜面が崩壊した場合、宮殿のみならず臨憧県の中心部の住宅密集地を直撃し大災害になる。斜面変形の観測とボーリング、調査トンネルによる地質調査により、この斜面が現在大規模岩盤すべりの前兆である岩盤クリープの段階にあることがわかった。リングせん断試験等の土質試験の結果、この驪山の岩盤すべりは1903年のカナダ・フランク地すべりや1983年中国・Sale山地すべりのように飽和沖積層への非排水載荷のメカニズムによって長距離運動するであろうことを示している。将来起こるであろうこの地すべり災害を防ぐためには、以下の2通りの災害の危険への備え、すなわち1)斜面運動の自動観測システムの設置、2)クリープ中の岩盤斜面の安定化工法、を遅すぎることのないよう早急に実施することが必要である。, Results of the Japan-China joint Research on Assessment of Landslide Hazard in Lishan, Xian, China which have been carried out since 1991 were summarized. The slope behind the Huaqing Palace had been suspected to have a potential large-scale landslide which may fail the Palace and the center of Lintong county.Monitoring of slope deformation and geological investigation by boring and investigation tunnel during this joint research exposed that this slope is now in the rock creep process of large scale rockslide. The geotechnical test proved that this rock slide mass must travel long like the 1903 Frank Slide in Canada and the 1983 Sale landslide in China in the undrained loading mechanism onto the saturated alluvial deposit in Lishan. To prevent or mitigate the coming disaster, two ways of landslide risk preparedness should be taken without delay. 1) to install automatic monitoring system of slope movement, and 2) to stabilize the creeping rock slope.

Results of the Japan-China joint Research on Assessment of Landslide Hazard in Lishan, Xian, China which have been carried out since 1991 were summarized. The slope behind the Huaqing Palace had been suspected to have a potential large-scale landslide which may fail the Palace and the center of Lintong county.Monitoring of slope deformation and geological investigation by boring and investigation tunnel during this joint research exposed that this slope is now in the rock creep process of large scale rockslide. The geotechnical test proved that this rock slide mass must travel long like the 1903 Frank Slide in Canada and the 1983 Sale landslide in China in the undrained loading mechanism onto the saturated alluvial deposit in Lishan. To prevent or mitigate the coming disaster, two ways of landslide risk preparedness should be taken without delay. 1) to install automatic monitoring system of slope movement, and 2) to stabilize the creeping rock slope.