针对岩质高边坡的稳定问题,提出了基于变温相似材料的降强法与倾斜抬升超载法相结合的综合法模型试验方法,建立了边坡稳定综合法试验安全评价方法,并针对白鹤滩电站左岸强卸荷区高边坡的稳定问题开展试验研究。通过典型剖面及卸荷区边坡的2个模型试验,获得了边坡在底滑面降强后的变形特性和破坏机理,揭示了缓倾结构面是影响白鹤滩边坡稳定的控制性因素,其失稳模式为滑移—拉裂的块体滑动破坏。试验结果表明,在底滑面前缘区域布置混凝土置换洞,可有效增强底滑面抗剪能力、减小边坡变形、阻止滑块形成,加固后的边坡稳定安全系数为KSC=1.42～1.58。研究成果为白鹤滩边坡工程的安全评价和加固处理提供了科学依据,同时也为类似边坡工程提供参考。
Abstract
A comprehensive model test method is proposed to study the stability of rock slope. The comprehensive method involves the strength reduction method based on temperature-dependent similar material and the overloading method by inclined lifting. Corresponding safety evaluation method for slope stability is also established. The left bank high slope in strong unloading area at Baihetan Hydropower Station is taken as a case study. Through two model tests of a typical section and the whole slope in strong unloading area, the deformation features and failure mechanism after reducing the strength of bottom sliding surfaces are obtained. Results reveal that the gently-inclined structural planes are dominant factors of slope stability; the failure mode is block sliding with sliding-tension fracturing. Moreover, results also suggest that concrete replacement plugs in the front area of bottom sliding surface is an effective measure of enhancing the shear capacity of bottom sliding surface, reducing slope deformation and preventing blocks from sliding. The safety factor of reinforced slope is between 1.42 and 1.58. The research results provide an important scientific basis for the slope safety evaluation and the reinforcement treatment of Baihetan Hydropower Station, and also offer reference for similar slope projects.
关键词
白鹤滩水电站 /
岩质高边坡 /
综合法模型试验 /
稳定性分析 /
加固效果评价
Key words
Baihetan Hydropower Station /
high rock slop /
comprehensive model test /
stability analysis /
reinforcement effect evaluation
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参考文献
[1] 宋胜武,巩满福,雷承第,等.峡谷地区水电工程高边坡的稳定性研究[J].岩石力学与工程学报,2006,25(2): 226-234.
[2] 沈 泰.地质力学模型试验技术的进展[J].raybet体育在线
院报,2001,18(5):32-36.
[3] 周维垣,林 鹏,杨 强,等.锦屏高边坡稳定三维地质力学模型试验研究[J].岩石力学与工程学报,2008,27(5):893-901.
[4] 沈 泰,岳登明,郭春茂.三峡船闸地质力学模型结构稳定研究[J].raybet体育在线
院报,1991,8(2):68-72.
[5] 肖诗荣,刘德富,姜福兴,等.三峡库区千将坪滑坡地质力学模型试验研究[J].岩石力学与工程学报,2010,29(5): 1023-1030.
[6] 油新华,李 晓.国外离心模型试验技术在边坡工程中的应用现状与展望[J].工程地质学报,2000,8(4):442-445.
[7] 李 明,张 噶,李焯芬,等.开挖对边坡变形影响的离心模型试验研究[J].岩土工程学报,2011,33(4):667-672.
[8] 马时强,刘 斌.锦屏高边坡稳定地质力学模型试验研究[J].西华大学学报(自然科学版),2008,27(4):101-104.
[9] 肖旦期,胡 华,董 云.边坡变形破坏机制的底摩擦试验模拟[J].交通科学与经济,2004,(1):16-18.
[10]吴 剑,张振华,王幸林,等.边坡物理模型倾斜加载方式的研究[J].岩土力学,2012,33(3):713-718.
[11]陈立杰,蔡雪雁,王正中.计算边坡安全系数的坡角增大法及其应用研究[J].raybet体育在线
院报,2011,28(7):47-56.
[12]周先齐,徐卫亚,钮新强,等.基于强度折减的离散单元法在岩质边坡稳定性分析中的应用[J].raybet体育在线
院报, 2008,25(5):107-110,114.
[13]张 林,陈 媛,杨宝全,等.水工大坝与地基模型试验及工程应用[M].2版.北京:科学出版社,2015.
[14]郑文棠,徐卫亚,张治亮,等.复杂楔形体组合下的岩质高边坡分析[J].raybet体育在线
院报,2008,25(5):115-119.
基金
国家重点研发计划资助项目(2016YFC0401908);国家自然科学基金项目(51609163)
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