预加固高填方边坡滑动破坏的离心模型试验研究

›› 2013, Vol. 34 ›› Issue (11): 3061-3070.

预加固高填方边坡滑动破坏的离心模型试验研究

李天斌¹，田晓丽^{1, 3}，韩文喜¹，任洋¹，何勇¹，魏永幸²

1. 成都理工大学地质灾害防治与地质环境保护国家重点实验室，成都 610059；2. 中铁二院工程集团有限责任公司，成都 610031； 3. 四川公路桥梁建设集团有限公司，成都 610041

收稿日期:2013-06-29 出版日期:2013-11-09 发布日期:2013-11-11
作者简介:李天斌，男，1964年生，博士，教授，主要从事岩土工程和工程地质领域的教学和研究工作
基金资助:
地质灾害防治与地质环境保护国家重点实验室团队重点课题(No. SKLGP2011Z002)；成都理工大学优秀创新团队培育计划(No. HY0084)。

Centrifugal model tests on sliding failure of a pile-stabilized high fill slope

LI Tian-bin¹，TIAN Xiao-li^{1, 3}，HAN Wen-xi¹，REN Yang¹，HE Yong¹，WEI Yong-xing²

1. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China; 2. China Railway Eryuan Engineering Group Co., Ltd., Chengdu 610031, China; 3. Sichuan Road and Bridge (Group) Co., Ltd., Chengdu 610041, China

Received:2013-06-29 Online:2013-11-09 Published:2013-11-11

摘要/Abstract

摘要： 2009年10月3日，攀枝花机场260×104 m3万方的高填方预加固边坡整体失稳，沿基覆界面下滑，并超覆于其下方的易家坪老滑坡之上，使易家坪老滑坡再次复活。这一填方边坡失稳事件最终导致机场停航两年。通过大型离心模型试验，再现了攀枝花机场预加固高填方边坡的滑动失稳过程，获得了边坡变形破裂的特征参量，阐明了边坡的滑动失稳机制。研究表明：天然工况下，边坡变形以坡顶沉降和沿基覆界面软弱层的蠕滑为主，坡体总体处于蠕滑变形状态；降雨和地下水工况下，坡体中后部拉张破裂和中前部挤压变形显著，具有塑性流动及推移式破坏特征，并最终产生溃滑失稳；预加固抗滑桩承受较大的边坡变形推力，且越靠近坡体后部的桩推力越大，最终从后向前逐排产生累进性剪断破坏，说明该填方边坡多排抗滑桩的平面布置和受力确定欠合理；降雨和地下水工况下，坡体的最大孔隙水压力是天然工况下的3.7倍，孔隙水压力对坡体失稳有重要作用；通过模型和原型的综合对比分析，该边坡的滑动失稳机制为推移式蠕滑-累进性折断-溃滑与超覆。

关键词: 加固桩, 高填方边坡, 离心模型试验, 滑动失稳机制

Abstract: At 15:00 PM on October 3, 2009, the 260×104 m3 of the pile-stabilizing fill slope slid suddenly in Panzhihua airport in Southwest China, so as to reactivate the Yijiaping landslide located at the downside of the fill slope and cause 2 years interruption of Panzhihua airport. Sliding mechanism of the pile-stabilizing fill slope under rainfall conditions is studied using a centrifuge modeling technique. A series of centrifuge tests on the reinforced model are conducted respectively during different accelerations under natural and rainfall conditions, reproducing the slide process of the fill slope. The analysis of the centrifuge model test results is performed to investigate the sliding mechanism of the landslide. Under natural condition, deformation of the slope includes crest settlement and creep of soft layer mainly; and the slope appears creep state. Under rainfall and groundwater conditions, tensile fracture of rear and compressive failure of front are obvious; and the slope shows progressive break characteristic and slides finally. The piles in the slope stressed larger, and the closer pile to the rear end of the slope, the larger the pile’s pushing force, which causes the progressive failure of piles from rear to front. The irrational pile spacing among three rows of piles may account for the incapability of piles in retaining the slope. It can be concluded that the occurrence of slope failure is contributed to the soft layer at the soil-rock interface and the high pore pressure in rainfall condition, which is found to be 3.7 times the pore pressure under natural condition. Comparing the model test with the prototype test, the sliding mechanism of the fill slope can be recognized as shear creeping-progressive breaking-sliding mode.

Key words: high fill slope, stabilizing pile, centrifugal model test, sliding mechanism

中图分类号:

TU 411

李天斌，田晓丽，韩文喜，任洋，何勇，魏永幸 . 预加固高填方边坡滑动破坏的离心模型试验研究[J]. , 2013, 34(11): 3061-3070.

LI Tian-bin ，TIAN Xiao-li ，HAN Wen-xi ，REN Yang ，HE Yong ，WEI Yong-xing . Centrifugal model tests on sliding failure of a pile-stabilized high fill slope[J]. , 2013, 34(11): 3061-3070.

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