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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

第13卷    第2期    总第71期    2016年2月

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文章编号:1672-7029(2016)02-0301-08
基于周边收敛的初始地应力场反分析
傅鹤林,李亮,郑刚强,张加兵

(中南大学土木工程学院,湖南长沙 410075)

摘 要: 基于隧道开挖导致的周边收敛量测值,结合FLAC3D正分析得出的一些位移基础量,通过分解、模拟自重应力场及边界构造应力场,建立周边收敛位移的线性方程组,并采用最小二乘法矛盾方程,然后反推出初始地应力场。将反演分析得出的初始地应力场的结果代入FLAC3D进行数值模拟计算,正算该典型断面在开挖完成以后,下台阶收敛测线的最终净空收敛值,并将其与现场监控量测得到的实测数据进行对比分析。分析表明两者基本吻合,验证了反演分析的合理性。

 

关键字: 反分析;地应力场;数值模拟;位移反分析法

Inverse analysis on initial stress field based on peripheral displacement convergence
FU Helin, LI Liang, ZHENG Gangqiang, ZHANG Jiabing

School of Civil Engineering, Central South University University, Changsha 410075, China

Abstract:Based on peripheral convergence measurement value caused by tunnel excavation and basic displacement proposed by FLAC3D, system of linear equations of peripheral displacement convergence was established in this paper by disassembled and simulated self-weight stress field. By virtue of least square method, the inconsistent equation was solved, and the inital stress field was then datermined. Plugging the inverse analysis results into FLAC3D, the clearance convergence value in the bottom bench convergence survey line after the excavation of the typical sections is analyzed and the result was compared with the test data. The result show that the measured value basically agrees well with calculated value, which verifies the rationality of the inverse analysis.

 

Key words: inverse analysis; stress field; numerical simulation; displacement anti-analytic method

ISSN 1672-7029
CN 43-1423/U

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