›› 2017, Vol. 38 ›› Issue (S2): 311-316.doi: 10.16285/j.rsm.2017.S2.043

• 基础理论与实验研究 • 上一篇    下一篇

基于裂隙充填特征的坝基岩体灌浆效果评价

伍宇腾1,韩增强2,王川婴2,周济芳1,胡 胜2,汪进超1   

  1. 1. 雅砻江流域水电开发有限公司,四川 成都 610051;2. 中国科学院武汉岩土力学研究所 岩土力学与工程国家重点实验室,湖北 武汉 430071
  • 收稿日期:2017-03-10 出版日期:2017-11-23 发布日期:2018-06-05
  • 通讯作者: 韩增强,男,1986年生,博士,助理研究员,主要从事钻孔摄像技术及岩土工程测试方面的研究。E-mail: zqhan@whrsm.ac.cn E-mail:wuyuteng@ylhdc.com.cn
  • 作者简介:伍宇腾,男,1970年生,学士,高级工程师,主要从事大型水电工程建设和质量管理工作。
  • 基金资助:

    国家自然科学基金项目(No. 41402278, No. 41472271)。

Grouting effect evaluation of dam foundation rock mass based on fracture filling characteristics

WU Yu-teng 1, HAN Zeng-qiang 2, WANG Chuan-ying2, ZHOU Ji-fang1, HU Sheng2, WANG Jin-chao1   

  1. 1. Yalong River Hydropower Development Co., Ltd., Chengdu, Sichuan 610051, China; 2. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China
  • Received:2017-03-10 Online:2017-11-23 Published:2018-06-05
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (41402278, 41472271).

摘要: 灌浆是水工建筑物基础处理中最常用的技术手段,通过灌浆封堵裂隙使基础岩体的防渗性、结构强度等达到设计要求。裂隙是透水透浆的最基本结构面,在灌浆处理中浆液对裂隙的充填程度是灌浆效果最直观的表现,由于灌浆工程的隐蔽性,裂隙的充填特征难以直接获取到,目前大多采用间接的压水试验法进行效果评价。利用钻孔摄像技术对灌浆钻孔进行成像探测,获取钻孔360°壁面图像,识别灌浆后的裂隙充填特征,考虑不同充填特征对灌浆效果的影响,建立以充填裂隙和未充填裂隙为要素的灌浆效果评价指标——钻孔内裂隙充填指数(borehole fracture filling integrity,BFFI),探讨BFFI与常规压水试验透水率结果的相关关系,利用三次多项式拟合两种评价指标的函数关系,建立基于钻孔内裂隙充填指数的灌浆效果评价标准,并将该方法应用到雅砻江桐子林水电站厂房坝区帷幕灌浆补充试验中,结果表明,(1)压水试验法和BFFI法的灌浆效果评价结果吻合度较高,进一步说明了BFFI法评价灌浆效果的可行性;(2)利用钻孔摄像技术开展灌浆效果评价,既直观地展示浆液在裂隙中的充填特征,又能反映灌浆效果,为灌浆效果评价提供了新的思路和方法。

关键词: 灌浆效果评价, 钻孔摄像, 裂隙充填特征, 压水试验, 裂隙充填指数

Abstract: Grouting is the most commonly used method in the foundation treatment of hydraulic structures. It can block cracks or fractures of the dam foundation rock mass to meet the design requirements, such as seepage resistance, structural strength, etc. The fracture is the most basic structural surface of the water permeability and the filling degree of grout is the most direct manifestation of grouting effect. However, due to the hidden feature of the grouting project, it is difficult to obtain the filling characteristics of the cracks directly. At present, the indirect water pressure test is the most method in grouting evaluation. The 360°borehole wall image obtained by borehole camera technology is used to identify the characteristics of fracture filling. Then an evaluation index based on the characteristics of fracture filling is put forward, which is called borehole fracture filling integrity(BFFI). The relationship between BFFI and permeability is discussed and the function relation of two evaluation indexes is established using the cubic polynomial. Based on the conventional evaluation method of water pressure test, the BFFI standard for grouting effect evaluation is established. The method is applied to the Yalong River Tongzilin hydropower station test grouting workshop, verifying the reliability of the proposed evaluation method. The results show that: (1) The results of water pressure test method and the BFFI method grouting effect evaluation are consistent, so as to further illustrate the feasibility of BFFI method to evaluate grouting effect. (2) The evaluation of grouting effect can be carried out based on the technology of borehole camera, which can not only show the filling situation of the grout in the fractures, but also reflect the grouting effect. The method based on fracture filling characteristics provides a new idea for grouting effect evaluation.

Key words: grouting effect evaluation, borehole camera, fracture filling characteristics, packer permeability test, borehole fracture filling integrity(BFFI)

中图分类号: 

  • TU 452

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