The Controlling Scheme of the Giant Landslide at Expressway Interchange of the Renmuxin Section from G4216

The Xinshi town is very important for the highway network since four expressways intersect here and they are the Renmuxin road, Yibin-Xinshi road Xinshi-Jinyang road and Chuansi-Xinshi road. It is necessary to build a interchange at the town. However, serval giant landslides were discovered around the place where is planned to construct the interchange. Those brought great challenge to the engineering protection of the interchange and the controlling design for the landslides. Based on the laboratory experiment and engineering condition, the force parameters of the sliding soil were back calculated. Hence, the maximum residual thrust of the main sliding surface is 16720 kN/m by calculated the residual thrust of the four sliding surfaces. Taking consideration into the construction design of the interchange, the road elevation and the residual thrust, the distributed treatment were applied on the controlling scheme of these giant landslide. Firstly, reducing the load to make sure the whole stability; Secondly, anti-slide piles are fixed at front of the slide to reinforce the secondary slide surface; Thirdly, anchor bolts or cables are driven into the slope after the load reduction; Fourthly, the anti-slide piles which has small cross-section are used to support the medium and the small landslide at the top; Finally, the drainage and interception measurements both protect the landslide from the water.