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糯扎渡水电站厂房区三维地应力场反演分析

ISSN号：1001-4179
期刊名称：《人民长江》
时间：0
分类：P64[天文地球—地质矿产勘探;天文地球—地质学]
作者机构：[1]河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京210098, [2]河海大学岩土工程研究所,江苏南京210098
相关基金：国家自然科学基金资助项目（50539110）

关键词：地应力场, 应力回归分析, 有限差分, 糯扎渡水电站, ground stress field, stress regression analysis, finite difference, Nuozhadu hydropower station

中文摘要：

在分析糯扎渡水电站地下厂房区工程地质资料及地应力实测资料的基础上，建立了三维地质概化模型。对现有地应力场反演方法进行优缺点与适用性分析，确定采用应力回归反演法。根据应力回归法原理．借助三维有限差分程序FLAC^3D，对施加应力边界条件和位移边界条件模拟构造作用的效果做了对比，确定采用施加位移边界条件模拟构造作用。同时考虑到研究区域总体地应力水平较低的实际情况，通过试算确定了模拟各构造作用的位移边界值的大小。通过模拟计算，获得了影响地应力场形成的各因素（自重与构造作用）单独作用下的基本应力场并提取得到测点处的计算应力值，继而形成回归分析样本数据，由此建立实测应力与自重应力分量及各基本构造作用应力分量问的多元线性回归关系，得到最优回归系数。对比实测与反演所得应力，两者在数值上的差值在可接受的范围内，方向上则基本接近。反演所得地应力场的规律性与依据实测数据所做的推断基本一致，可用于后续调压井及相关区域洞室开挖稳定性分析。

英文摘要：

Based on the geological data and measured data of in - situ stress in power house area of Nuozhadu Hydropower Station, a generalized 3D geology model is established. The stress regression analysis method is selected for inversion analysis after analyzing the advantage, disadvantage and applicability of existed methods. Based on the principle of stress regression analysis and with the aid of finite differential program FLAC^3D, the tectonism simulations are compared under the condition of considering stress boundary condition and displacement condition and it is determined that the tectonism should be simulated under displacement boundary conditions. Taking the low ground stress in the area into account and through trial calculation, the displacement boundary values are determined for the simulation of various tectonisms. Through simulation analysis, the fundamental stress fields corresponding to each individual factor which contribute to the formation of in - situ stress field（ such as gravity and geology tectonisms） and the stress at measuring points to construct samples data for regression analysis are obtained. Then, a linear multiple regression relationship among the measured in - situ stress, gravity stress and various tectonic stresses is built and the optimal regression coefficients are found using least squared method. With comparison of the measured data and the analysis results of regression analysis, it is found that two results are close in principle stress and orientation and the value error is tolerable. The law of ground stress field by regression analysis is basically in accordance with analysis result by measured data, which suggests that the calculated stress field can be applied to the stability analysis in follow - up excavation of surge shaft and caverns in related area.

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