江坪河水电站进水口顺层岩体边坡支护结构受力特性及稳定性研究  

Stability analysis of the stratified rock mass slope near the inlet of the Jiangpinghe hydropower engineering and the bearing performance of the support structure

作　　者：冯树荣 蒋中明[2] 秦卫星[2] 赵红敏 蔡昌光 

机构地区：[1]中南勘测设计研究院,水能资源利用关键技术湖南省重点实验室,湖南长沙410014 [2]长沙理工大学水利工程学院,湖南长沙410004

出　　处：《水文地质工程地质》2014年第6期51-56,69,共7页Hydrogeology & Engineering Geology

基　　金：水能资源利用关键技术湖南省重点实验室开放研究基金资助项目(PKLHD101305);"十二五"科技支撑计划课题(2012BAK03B04)

摘　　要：江坪河水电站进水口边坡断层、层间错动以及泥化夹层等软弱结构分布众多,构成了顺坡向的潜在滑动组合体。为确保边坡的安全稳定性,采用了预应力锚索和大截面抗滑桩对边坡进行加固处理。边坡施工过程中,部分预应力锚索轴力监测值出现超过设计吨位的现象。为分析边坡锚索和抗滑桩支护系统的可靠性,采用三维数值分析方法对锚索和抗滑桩等支护结构的受力性态进行了系统研究。三维数值分析结果表明顺层岩体结构边坡中支护结构部件空间受力特性存在较大的差异性:局部预应力锚索轴力长期超限失效可能引起支护系统其它构件内力增加,危及边坡稳定性;抗滑桩的内力分布与岩体层间错动和泥化夹层的空间展布密切相关。受岩体结构面影响,抗滑桩内力分布类似于连续梁受力分布特点。支护结构的空间受力特点表明支护系统设计时应该考虑边坡及支护结构的整体空间效应影响,以保证支护结构自身的安全性。The slope at the intake of the Jiangpinghe hydropower station consists of rock mass which is cut by faults,layer interfaces and muddy interlayer.A support system composed of pre-stressed cables and huge antislide piles is adopted to reinforce the slope in case of the instability of the slope.During the construction period of the slope excavated,the monitored axial force in part of pre-stressed cable excesses the designed value.To ensure the reliability of pre-stressed cable and anti-slide piles,a three dimension numerical method is employed to study the bearing performance of the pre-stressed cable and anti-slide pile.Numerical results show that there exists difference in spatial bearing performance characteristics of support structure members in the complicated rock mass slope.The axial force of part of pres-stressed cable exceeding their design value over a long time will induce the increase of the inner force of the other structure members and increase the instability risk of the slope.The inner force distribution of anti-slide pile is related to the space distribution of the interfaces such as faults and muddy interlayer,etc.The pile in the rock mass with interfaces acts as a continuous beam.The results indicate that the effect of spatial bearing performance characteristics of the structure member should be considered in the design work to ensure the safety of the support structure itself.

关 键 词：层状岩体边坡 预应力锚索 抗滑桩 空间受力特性 数值方法 

分 类 号：TU443[建筑科学—岩土工程] TU457[建筑科学—土工工程]