复杂地质条件重力锚岩体力学试验及工程应用

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摘要 研究目的: 重力锚地基岩土体力学参数是抗滑稳定分析(或复核)的重要依据,本文在香丽高速公路虎跳峡金沙江大桥重力锚基坑底面,选取7个具有地质代表性的岩土层进行现场力学试验,以获得承载力、基底摩擦系数等力学参数。
研究结论: (1)碎石土夹块石体承载力特征值119 kPa、基底摩擦系数0.44,强风化千枚岩承载力特征值508 kPa、基底摩擦系数0.35,劈理密集带基底摩擦系数0.45,均不满足设计要求;(2)基础右侧劈理密集带承载力特征值719 kPa、基底摩擦系数0.95,劈理密集带承载力特征值为720 kPa,中风化砂质板岩承载力特征值1.44 MPa、基底摩擦系数1.22,中风化砂质板岩夹千枚岩承载力特征值1.44 MPa、基底摩擦系数0.65,强风化砂质板岩夹千枚岩承载力特征值719 kPa,均满足设计要求;(3)对不满足设计要求的碎石土夹块石体、强风化砂质板岩夹千枚岩地基,采用开挖换填混凝土、固结灌浆等措施进行加固,再通过复核重力锚的抗滑稳定系数;(4)本文研究成果可为复杂地质条件下重力锚的安全稳定运行提供参考。

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	郭喜峰
	余美万
	王新泽

关键词 ：重力锚, 承载力特征值, 基底摩擦系数, 施工措施

Abstract：Research purposes: The mechanical parameters of the rock and soil mass of the gravity anchor foundation are an important basis for the analysis (or review) of stability against sliding. In this paper, seven geologically representative foundations were selected and in-situ mechanical tests were carried out on the bottom of the gravity anchor foundation at the Jinsha River Bridge in the Tiger Leaping Gorge of Shangrila-Lijiang Expressway, to obtain mechanical parameters such as bearing capacity and friction coefficient of the base.
Research conclusions: (1) The characteristic value of bearing capacity of crushed stone soil is 119 kPa and the base friction coefficient is 0.44, the characteristic value of bearing capacity of the strongly weathered phyllite is 508 kPa and the base friction coefficient is 0.35, the base friction coefficient of the cleavage dense zone in the excavation area is 0.45, which does not meet the design requirements. (2) The characteristic value of bearing capacity of the cleavage dense zone on the right side of the anchorage foundation is 719 kPa and the friction coefficient of the base is 0.95, the characteristic value of bearing capacity of the cleavage dense zone in the excavation area of the left anchor rake angle of the anchorage foundation is 720 kPa, the characteristic value of moderate weathered sandy slate bearing capacity is 1.44 MPa and the base friction coefficient is 1.22, the characteristic value of medium weathered sandy slate with phyllite is 1.44 MPa and the base friction coefficient is 0.65, and the characteristic value of strong weathered sandy slate with phyllite 719 kPa, which all meet the design requirements. (3) For the foundations of the crushed soil with the stone mass and the strongly weathered sandy slate with phyllite that does not meet the design requirements, the measures such as excavation and replacement of concrete, consolidation grouting, are used for reinforcement, and then the anti-slip stability factors of gravity anchors are reviewed. (4) The research results can provide reference for the safe and stable operation of gravity anchorage under complex geological conditions.

Key words： gravity anchorage characteristic value of bearing capacity base friction coefficient construction measure

收稿日期: 2021-04-28

PACS:

TU459

基金资助:国家重点研发计划(2016YFC0401801);云南省重大科技专项计划(202002AF080003)

作者简介: ^**郭喜峰,1984年出生,男,高级工程师。

引用本文:

郭喜峰, 余美万, 王新泽. 复杂地质条件重力锚岩体力学试验及工程应用[J]. 铁道工程学报, 2022, 39(11): 57-62.
GUO Xifeng, YU Meiwan, WANG Xinze. Rockmass Mechanical Tests and Its Engineering Application about Complicated Geological Conditions Gravity Anchorage Basement. Journal of Railway Engineering Society, 2022, 39(11): 57-62.

链接本文:

https://tdgcxb.crec.cn/CN/ 或 https://tdgcxb.crec.cn/CN/Y2022/V39/I11/57

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