深切河谷区地应力场分布规律研究

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Abstract Based on statistical analysis of the measured in-situ stress results in seven dam areas of the west route of South-to-North Water Transfer Project by using hydrofracturing method，the piecewise linear relationship between magnitude of maximum horizontal principal stress and borehole depth is obtained in steep and narrow river valleys. The analysis results also show that the magnitude of maximum horizontal principal stress increases less in shallower parts(stress relief zone) but increases more in deeper parts(stress concentration zone) with the increment of buried depth of rocks. In addition，back analysis for in-situ stress field in Ada dam area is carried out by using the fast Lagrangian analysis of continua in 3 dimensions(FLAC3D). The results are as follows：(1) The stress field in shallow bank slope areas is obviously affected by unloading effect of river valleys；so the hydrofracturing method might not be used to determine the stress of this local area. The orientation of stress field in the riverbed is practically unaffected by unloading effect；and the hydrofracturing method can be used to determine the state of stress in the river valley. (2) The initial stress field both in the river valley and along the bank slope may be divided into three parts，i.e. stress relief zone，stress concentration zone and smooth stress zone. (3) The depth of stress concentration zone in steep and narrow river valleys is between 60–140 m beneath the riverbed. (4) The depth of stress concentration zone in steep and narrow river valleys is greatly affected by unloading characteristics of rock masses as well as geographical and topographic features.

Key words： rock mechanics deep and narrow river valleys in-situ stress field stress relief stress concentration back analysis

Received: 14 February 2011

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https://rockmech.whrsm.ac.cn/EN/Y2011/V30/I12/2435

[1] 白世伟，李光煜. 二滩水电站坝区岩体应力场研究[J]. 岩石力学与工程学报，1982，1(1)：45–56.(BAI Shiwei，LI Guangyu. Study on in-situ stress field of rock masses in dam area of Ertan hydropower plant[J]. Chinese Journal of Rock Mechanics and Engineering，1982，1(1)：45–56.(in Chinese)) [2] 修俊峰，徐同海，马岱馨，等. 沿河谷地区地应力的地质成因及其展布规律[J]. 岩石力学与工程学报，1986，5(3)：257–265.(XIU Junfeng，XU Tonghai，MA Daixin，et al. Geological factor and distribution regularities of in-situ stress field of rock masses in valley area[J]. Chinese Journal of Rock Mechanics and Engineering，1986，5(3)：257–265.(in Chinese)) [3] 朱焕春，陶振宇. 地形地貌与地应力分布的初步分析[J]. 水利水电技术，1994，(1)：29–33.(ZHU Huanchun，TAO Zhengyu. A preliminary analysis of ground stress and topography morphology[J]. Water Resources and Hydropower Engineering，1994，(1)：29–33.(in Chinese)) [4] 朱焕春，陶振宇，黄德凡. 河谷走向与河谷地应力分布[J]. 岩石力学与工程学报，1995，14(1)：17–24.(ZHU Huanchun，TAO Zhengyu，HUANG Defan. Influence of the trend of river on rock stress in valley[J]. Chinese Journal of Rock Mechanics and Engineering，1995，14(1)：17–24.(in Chinese)) [5] 朱焕春，赵海斌. 河谷地应力场数值模拟[J]. 水利学报，1996，(5)：29–36.(ZHU Huanchun，ZHAO Haibin. Numerical simulation for rock stress field in a valley[J]. Journal of Hydraulic Engineering，1996，(5)：29–36.(in Chinese)) [6] 黄润秋，张卓元. 中国西南地壳浅表层动力学过程及其工程环境效应研究[M]. 成都：四川大学出版社，2001：227–232.(HUANG Runqiu，ZHANG Zhuoyuan. Study on dynamics process of shallow crust and engineering- environment effects in Southwest China[M]. Chengdu：Sichuan University Press，2001：227–232.(in Chinese)) [7] 黄润秋. 中国西部岩石高边坡应力场特征及其卸荷破裂机制[J]. 工程地质学报，2004，9(3)：227–232.(HUANG Runqiu. Geo-stress distribution and unloading fracturing mechanism of high rock slopes in Western part of China[J]. Journal of Engineering Geology，2004，9(3)：227–232.(in Chinese)) [8] 田玉中，李攀峰. 两种典型河谷应力场应力分布特征对比分析[J]. 地质灾害与环境保护，2002，13(3)：60–63.(TIAN Yuzhong，LI Panfeng. Study on distributing features of two typical deep-cutting gorges[J]. Journal of Geological Hazards and Environment Preservation，2002，13(3)：60–63.(in Chinese)) [9] 中国科学院武汉岩土力学研究所. 南水北调西线二期工程地应力测试报告(II)[R]. 武汉：中国科学院武汉岩土力学研究所，2005. (Institute of Rock and Soil Mechanics，Chinese Academy of Sciences. Experimental report on in-situ stress in the second stage of west route of South-to-North Water Transfer Project(II)[R]. Wuhan：Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，2005.(in Chinese)) [10] 刘亚群，罗超文，李海波. 南水北调西线工程区地应力测量及地应力场特征分析[J]. 岩石力学与工程学报，2005，24(20)：3 620–3 624. (LIU Yaqun，LUO Chaowen，LI Haibo，et al. Study on in-situ stress measurements and characteristics of in-situ stress field in west route of South-to-North Water Transfer Project[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(20)：3 620–3 624.(in Chinese)) [11] 刘允芳，罗超文，龚壁新，等. 岩体地应力与工程建设[M]. 武汉：湖北科学技术出版社，2000：202–215.(LIU Yunfang，LUO Chaowen，GONG Bixin，et al. Geostress of rock mass and engineering construction[M]. Wuhan：Hubei Science and Technology Press，2000：202–215.(in Chinese)) [12] 付成华，汪卫明，陈胜宏. 溪洛渡水电站坝区初始地应力场反演分析研究[J]. 岩石力学与工程学报，2006，25(11)：2 305–2 312.(FU Chenghua，WANG Weiming，CHEN Shenghong. Back analysis of initial geostress field of dam site for Xiluodu hydropower project[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(11)：2 305–2 312.(in Chinese))