兰州水源地工程超长输水隧洞初始地应力反演研究  

Inversion Analysis of Initial Geostress of Long Water Conveyance Tunnel in Lanzhou Water Source Projects

作　　者：杨风威[1] 房敬年[1] 杨继华[1] 杨凡杰[2] 张传庆[2] YANG Feng-wei;FANG Jing-nian;YANG Ji-hua;YANG Fan-jie;ZHANG Chuan-qing(Yellow River Engineering Consulting Co.,Ltd.,Zhengzhou 450003,China;State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China)

机构地区：[1]黄河勘测规划设计有限公司,河南郑州450003 [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

出　　处：《水电能源科学》2018年第8期94-97,73,共5页Water Resources and Power

基　　金：黄河勘测规划设计有限公司自主研究开发项目(2016-ky57(2));国家自然科学基金项目(51404240)

摘　　要：兰州水源地工程输水隧洞全长31.29km,沿线地质条件复杂。为准确获得该超长输水隧洞沿线的初始地应力场分布情况,分别采用多元线性回归方法(方法1)和粒子群-神经网络智能反演方法(方法2)开展了初始地应力场研究。结果表明,兰州水源地工程输水隧洞沿线地应力属中等地应力场,以水平构造应力为主,埋深较大时(>380m)逐渐转变为以自重应力场为主;两种方法所得地应力值均与实测值相近,方法2的计算精度较方法1高,但计算量约大4倍,因而大范围地应力估算时方法1具有计算量小、精度足够的优点,而局部范围地应力估算时方法2精度更高、效果更好。The total length of water conveyance tunnel in Lanzhou water source projects is 31.29 km,and the geologic conditions along the tunnel layout line are complex.For accurately determining the distribution of initial geostress field,multiple linear regression method（method 1）and particle swarm-neural network intelligent inversion method（method 2）were adopted to analyze the initial geostress field.Results show that the geostress magnitude of water conveyance tunnel in Lanzhou water source projects belongs to medium level.The horizontal tectonic stress is dominated in the geostress field,but gradually dominated by gravity stress field after the depth is larger than 380 m.The geostress calculation values of two methods are both close to the measured values.The method 2 is better than method 1 in calculation accuracy,while the calculated amount of method 2 is about 4 times than method 1.Therefore,if geostress calculation is done in wide range,the method 1 is more suitable due to the smaller calculation amount and good calculation precision.But,if geostress precise calculation is demanded in a local scope,the method 2 can guarantee the calculation accuracy better.

关 键 词：兰州水源地工程 输水隧洞 初始地应力 回归分析 神经网络 

分 类 号：TV31[水利工程—水工结构工程] U455.4[建筑科学—桥梁与隧道工程]