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| MODELING TEST ON INITIATION MECHANISM OF LANDSLIDE IN OBLIQUE INCLINED THICK-BEDDED MOUNTAIN |
| FENG Zhen1，YIN Yueping2，CAI Qipeng3，LI Bin1 |
(1. Key Laboratory of Neotectonic Movement and Goehazard of MLR at Institute of Geomechanics，CAGS，Beijing 100081，China；
2. China Institute of Geo-Environment Monitoring，Beijing 100081，China；3. College of Civil Engineering，Huaqiao University，Xiamen，Fujian 361021，China) |
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Abstract This paper tries to reveal the mechanism of the Jiweishan landslide，which is known as an apparent rockslide from oblique inclined thick-bedded mountain. In previous study，a failure pattern that slide masses in the rear are key driving blocks for slope instantaneous failure was proposed. In order to validate it，centrifugal modeling test has been carried out with an optimized model to reproduce landslide initiation process and to analyze failure characteristic. The results show that the slope model slides at 73 g，which means the modeling test is approximately in agreement with the last test whose model fails at 80 g. It also indicates that a jointed model is easier to slide. Most of inner blocks are stuck on sliding surface and lateral blocks slide in apparent dip. Under 73 g，rear blocks begin to creep simultaneously with increase of centrifugal acceleration. During this phase，the key block in the front plays a role in anti-sliding. When acceleration reaches 73 g，the key block is squeezed out abruptly and triggers sliding of blocks from behind. The initiation mechanism involves transition from progressive failure to instantaneous failure and experiences a process of creeping，tensile failure，sliding，colliding in the front，apparent sliding，bursting out，disintegrating and accumulating.
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Received: 31 May 2013
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2014, Vol. 33 
