基于改进Sheorey模型的地应力估算方法及应用

发布时间：2018-06-23 13:05

本文选题：铁路隧道 + 地下工程　；参考：《现代隧道技术》2017年05期

【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。
[Abstract]:Geostress is one of the basic loads in underground engineering. Vertical stress can generally be calculated by overlying rock pressure. However, it is difficult to determine the static elastic thermodynamics model established by .Sheorey, which has a very high degree of recognition in the world. However, the model does not deal with the regional differences of tectonic effects, and does not solve the distribution characteristics of maximum and minimum horizontal principal stresses. By introducing the correction coefficient of regional tectonic stress and combining with the theory of elasticity, the Sheorey model is improved, and a method for estimating horizontal in-situ stress in elastic strata is put forward. In order to further investigate the effectiveness and practicability of the method, based on the Meihuashan Tunnel in Fujian Province, the field test work of the original rock stress and rock mass modulus was carried out, and the measured in-situ stress values were compared with the calculated values. The results show that there is a certain error between the theoretical calculation value and the measured value, which is mainly caused by the local geological structure and the heterogeneity of rock mass, but it can still meet the requirements of engineering precision within the range of error.
【作者单位】：长江科学院水利部岩土力学与工程重点实验室;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;
【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)
【分类号】：U451

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