王启云¹，张家生¹，陈晓斌¹，李春光²

（1 中南大学土木工程学院，长沙 410075；2 湖南高速铁路职业技术学院，衡阳 421002）

 

[摘要] 某复杂建筑高边坡紧邻深基坑，边坡采用锚喷支护结构和毛石挡土墙支护结构，基坑采用桩锚支护结构。在基坑开挖过程中，进行了变形和锚索轴力监测，重点对水平位移、深层土体位移及裂缝进行了监测。结果分析表明，桩锚支护结构能有效控制基坑变形，基坑呈倾覆破坏趋势，边坡呈滑动的破坏模式，且滑动面在不断扩展并形成新滑移体。降雨导致坡体易发生突发性变形，由降雨产生的边坡变形占总变形的比例可达50%以上；在支护结构全部锚索张拉锁定后，基坑开挖对坡体的变形影响较小。在边坡发生单次大变形后，软弱结构面以及岩土体的蠕变仍会形成较大坡体的变形。

[关键词] 桩锚支护结构；边坡；稳定性；变形监测

中图分类号：TU476文献标识码：A文章编号：1002-848X(2012)10-0130-06

 

Wang Qiyun¹, Zhang Jiasheng¹, Chen Xiaobing¹, Li Chunguang²

(1 School of Civil Engineering and Architecture, Central South University, Changsha 410075, China；2 Hunan Technical College of Railway High-speed, Hengyang 421002, China)

Abstract: Anchor-plate retaining structure and rubble retaining wall are applied as the bracing system of a complicated building slope which fringed a deep foundation pit, and pile-anchor system was adopted as the retaining structure for the foundation pit. During excavation, horizontal displacement, deformation of deep soil and cracks were monitored. The results indicate that the pile-anchor system can control the deformation effectively. The foundation pit is incline to overturn in the process of excavation, further, the breakage mode of the slope is slip and the slip surface is continuously expand to new sliding mass. Incidental deformation occures by rainfall and proves to be more than 50% of accumulative total displacement of slope.The deformation is discovered fluctuating to increase or decrease on the small side in the process of excavation after all the anchor ropes are locked. Once the slope has lager deformation, the latter creep of weak plane and rock-soil will induce more macroscopical displacement.

Keywords: pile-anchor retaining and protecting structure; slope; stability; deformation monitoring

作者简介：王启云，博士研究生，Email:wangqiyun860519@163.com。

 

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