基于改进Sheorey模型的地应力估算方法及应用  

Estimation Method for Geostress Based on a Modified Shoerey Model

作　　者：裴启涛[1] 丁秀丽[1] 黄书岭[1] 张雨霆[1] 罗超文[2] 

机构地区：[1]长江科学院水利部岩土力学与工程重点实验室,武汉430010 [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,武汉430071

出　　处：《现代隧道技术》2017年第5期36-43,共8页Modern Tunnelling Technology

基　　金：国家重点研发计划项目(2016YFC0401802;2016YFC0401804);中央级公益性科研院所基本科研业务费项目(CKSF2017030/YT);国家自然科学基金青年科学基金项目(51609018)

摘　　要：地应力是地下工程的基本荷载之一,垂直应力一般可采用上覆岩层压力计算,而水平应力却很难确定。Sheorey建立的静弹性热力学模型在国际上认可度非常高,但该模型未涉及构造作用影响的区域性差异,且没有解决最大、最小水平主应力的各自分布特征问题。文章通过引入区域构造应力修正系数,并结合弹性力学理论,对Sheorey模型进行改进,提出了弹性岩层中水平地应力估算方法。为进一步考察该方法的有效性与实用性,以福建梅花山隧道为依托,进行了原岩应力及岩体模量现场测试工作,并将实测地应力值与计算值进行对比。研究结果表明:理论计算值和实测值存在一定的误差,这主要是由局部地质构造及岩体非均匀性引起的,但在误差允许范围内,仍可满足工程精度要求。Geostress is one of the basic loads of underground works, and the vertical stress of a rock mass can be calculated using the overburden pressure while the horizontal stress is difficult to determine. The elasto-static ther- mal stress model established by Shoerey is widely accepted, but the model does not take the tectonic movement in- duced by regional differences into consideration, and the distribution rules of the horizontal maximum principal stress and minimum principal stress haven＇t been obtained. In this paper, Shoerey＇s model is modified by introduc- ing the correction factors of regional tectonic stress based on elasticity theory, and an estimation method for horizon- tal stress in an elastic rock mass is proposed. An in-situ stress and rock mass modulus measurement are carried out for the Meihuashan tunnel, and a comparison between the calculated results and the measured geostress data are conducted. The results show that the prediction error caused by the local geological structure and rock mass homoge- neousness is small and within the allowed scope, meeting the precision requirements for engineering.

关 键 词：铁路隧道 地下工程 地应力 弹性岩层 Sheorey模型 估算方法 

分 类 号：TU459[建筑科学—岩土工程] U451[建筑科学—土工工程]