Monitoring of large-diameter anti-slide piles and analysis of landslide thrust in resuscitated accumulation landslides
YANG Xiaohui1，2，CHEN Kunquan1，ZHANG Weixiong3，DING Baoyan3，ZHU Junchuan3
(1. School of Civil Engineering，Lanzhou University of Technology，Lanzhou，Gansu 730050，China；2. Western Engineering Research Center of Disaster Prevention and Mitigation in Civil Engineering，Ministry of Education，Lanzhou，Gansu 730050，
China；3. Gansu Geological Disaster Prevention Engineering Exploration and Design Institute Co.，Ltd.，
Lanzhou，Gansu 730050，China)
Abstract：In order to study the bearing characteristics and landslide thrust of large-diameter anti-slide piles in the treatment of revived accumulation landslides，based on the Treatment Project of H1 landslide at the Jiangdingya of Zhouqu County，steel bar stress gauges and concrete strain gauges were respectively arranged at the middle and corners of the front and back sides to sliding surface of the three large-diameter anti-slide piles，and earth pressure cells facing the sliding surface are arranged outside the retaining walls of the anti-slide piles. In this way，the long-term monitoring results were analyzed. The results show that：(1) The large-diameter anti-slide piles present good mechanical properties and have many extreme stress points on the front and back sides to the sliding surface. The design of anti-slide piles in the treatment of revived accumulation landslides should not be directly calculated by the current way；(2) In the section of large diameter anti-slide piles，the stress of the steel bar in the middle and corner along the width direction is not equal. The maximum tensile stress on the steel bar in the middle part of the front side to sliding surface can reach 2.4 times of the stress on the steel bar in the corner. It is not suitable to adopt the method recommended by the current code directly in the design of anti-slide pile in the treatment of resurrected accumulation body landslide；(3) The pile bending moment calculated according to the measured results has several extreme points，and the shear force of the anti-slide pile has multiple zero points，which indicates that there are multiple sliding surfaces in the revived accumulation landslide. The positions of the primary and secondary sliding surfaces should be considered in the subsequent landslides treatment project；(4) The distribution form of landslide thrust monitored by the earth pressure box is different from that of the code，and the resultant value is 1/3 of that calculated by the code. The resultant value of landslide thrust retrieved from the monitoring steel stress is half of the calculated result of the method recommended by the design code；(5) The pile-soil interaction of large diameter anti-slide pile in landslide control of multi-stage surface revived accumulation body is complicated，and the internal force of pile body calculated by design code is too large. The research results can provide scientific basis for the landslide treatment of this kind of revived accumulation body.
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2023, Vol. 42 
