院报 ›› 2018, Vol. 35 ›› Issue (4): 91-96.DOI: 10.11988/ckyyb.20161171

• 岩土工程 • 上一篇    下一篇

土石混合料填方体原位剪切试验方法探讨

龚辉1, 张晓健2, 艾传井2, 尚思良2, 徐炎兵2   

  1. 1.贵州桥梁建设集团有限责任公司 总工程师办公室,贵阳 550004;
    2.中国电力工程顾问集团中南电力设计院有限公司 勘测工程公司,武汉 430071
  • 收稿日期:2016-11-08 出版日期:2018-04-01 发布日期:2018-04-16
  • 作者简介:龚 辉(1986-),男,云南会泽人,高级工程师,博士,主要从事地基与基础工程设计、检测及施工方面的研究工作。E-mail:gh5614@csepdi.com
  • 基金资助:
    国家自然科学基金项目(41630643);国家自然基金面上项目(41272305);中南电力设计院大型科技项目(40-1A-KY201510-G01)

Two Methods of In-situ Shear Test for Soil-rock Mixture Filling: Problems and Analysis

GONG Hui1, ZHANG Xiao-jian2, AI Chuan-jing2, SHANG Si-liang2, XU Yan-bing2   

  1. 1.Chief Engineer Office, Guizhou Bridge Construction Group Co., Ltd., Guiyang 550004, China;
    2.Central Southern China Electric Power Design Institute, China Power Engineering Consulting Group,Wuhan 430071, China
  • Received:2016-11-08 Online:2018-04-01 Published:2018-04-16

摘要: 土石混合料中物质组成复杂、结构分布不规律,采样进行室内试验相对困难,因此最好通过现场原位剪切试验获取某特定工程最具针对性的力学参数;但超粒径颗粒的存在,使得将常规原位剪切试验运用于土石混合料力学参数取值时存在诸多问题,会对试验结果造成不可忽视的影响。对原位直剪试验和原位水平推剪试验这2类常见试验中存在的问题进行分析和对比。结果表明:原位水平推剪试验更适用于土石混合料此类非均匀体;通过对比几组原位试验结果,发现2类原位剪切试验得到的内摩擦角相近,但是黏聚力的值差异性较大。最后,对土石混合料原位水平推剪试验的参数取值提出了建议。

关键词: 土石混合料, 原位直剪试验, 水平推剪试验, 对比分析, 力学参数

Abstract: In-situ shear test is an optimum means of obtaining targeted strength parameters of rock-soil aggregate for specific project as sampling and in-door test are demanding because of the complex composition and irregular structure of soil-rock mixture. Nonetheless, problems arise in conventional in-situ shear test due to large particles, posing unneglectable impact on test results. In view of this, we compared and analysed the problems in in-situ shear test and horizontal push-shear test, and concluded that horizontal push-shear test is more suitable for heterogeneous body such as soil-rock mixture. We also found that the internal friction angles obtained by the two methods are close, whereas cohesions differ greatly. Finally, we gave some suggestions on determining the parameter values for in-situ pull-shear test.

Key words: soil-rock mixture, in-situ direct shear test, horizontal push-shear test, comparative analysis, mechanics parameters

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