Inversion of the fine in-situ stress field for deep-buried tunnel: A case study on the Jiangranshan tunnel of the Shuangjiang-Cangyuan express way in southwest Yunnan
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摘要:
针对复杂地质条件下深埋隧道精细应力场准确反演以及主要地质条件对地应力场影响问题，以滇西南双江至沧源高速姜染山隧道为例开展研究。采用精细DEM数据、实测地质资料建立隧址区精细地质模型，以地应力实测数据和GPS速度场数据作为联合约束条件，开展姜染山隧道工程区精细地应力场反演计算，揭示了隧址区精细应力场特征及主要地质条件影响作用。结果表明：隧道区模拟变形速度场与GPS观测结果基本一致，模型能够较好反映工程区现今构造应力环境；隧址区地应力场存在应力水平西高东低、主应力方向局部偏转的特征，近E-W向的小黑江断裂对研究区地应力场的影响主要表现为造成主应力方向小幅偏转，未造成应力量值急剧变化，局部次级断裂和地形叠加影响作用有限；隧道沿线最大主应力在7.47~27.23 MPa之间，中间主应力在1.59~15.12 MPa之间，最小主应力在0.01~6.71 MPa之间，隧道沿线应力水平总体上未表现出明显异常特征；基于反演精细应力场数据的岩石应力强度比方法计算结果显示，现今地应力条件下，隧道岩石强度应力比结果总体在0.20~0.48之间，表明隧道围岩整体为无岩爆和轻微岩爆情况。本研究实例表明，复杂地质条件下，利用精细DEM和实际断层资料等，可以建立适合工程区尺度的精细地质模型，有效揭示工程区应力场特征和主要地质条件影响作用，支撑隧道围岩工程稳定性评价。
Abstract:Under complex geological conditions of fault system, stratum and terrain, an accurate inversion of the in-situ stress field is a challenging and hot issue in the study on engineering geology. Focusing on the accurate inversion of fine in-situ stress field for deep-buried tunnel under complex geological conditions, and the influence of major geological factors on the stress state, we took the Jiangranshan tunnel of the express way from Shuangjiang to Cangyuan in southwest Yunnan as a case to perform the study. We first established the fine geological model of the Jiangranshan tunnel area by integrating the fine DEM data and the geological survey data. Then, taking the measured in-situ stress data in the tunnel site and the measured GPS data of velocity field as the integrated constraints, we carried out the inversion of fine in-situ stress field in the engineering region of Jiangranshan tunnel. On the basis of the inversion results, we analyzed the characteristics of fine in-situ stress field in the tunnel site and the influence of main geological conditions on the current in-situ stress field. Finally, we estimated the engineering geological stability of the surrounding rock mass of the Jiangranshan tunnel.
The results show that the simulated displacement velocity field in the Jiangranshan tunnel area is basically consistent with the GPS observation results, revealing that the inversion model adopted in this study can well reflect the current tectonic stress environment of the engineering region. The simulation results show that the level of the in-situ stress field in the western part of the study area is relatively high, while it is low in the eastern part. The direction of the maximum principal stress shows partial deflection in the study area. The influence of the nearly E-W-striking Xiaoheijiang fault—the largest fault in the study area—on the in-situ stress is that it causes the slight deflection of the direction of the maximum principal stress; however, it does not cause abrupt change of the in-situ stress magnitude. The secondary faults and topography show little effect on the in-situ stress field, which is limited to very small area and does not cause notable disturbance of the in-situ stress field. The results reveal that the maximum, intermediate, and minimum principal stresses along the tunnel mainly distribute in 7.47–27.23 MPa, 1.59–15.12 MPa, and 0.01–6.71 MPa, respectively, and does not show obviously abnormal characteristics. The engineering geological stability of the surrounding rock mass of the Jiangranshan tunnel is estimated by the stress intensity index (i.e., the ratio of the maximum tangential stress to the uniaxial compress strength of rock). The estimation results, which are determined by integrating the stress field simulation results and the mechanical properties of the typical rocks obtained from the laboratory tests, show that the stress intensity indexes of the Jiangranshan tunnel mainly range between 0.20–0.48. It indicates that the surrounding rock masses of the Jiangranshan tunnel are mainly in a stable state or in a slight rockburst risk under the current in-situ stress conditions. The conclusion can be drawn from the case study that under the complex geological conditions, the fine geological model suitable for the scale of engineering area can be established by using the fine DEM and actual fault and strata data, which can effectively reveal the characteristics of the in-situ stress field in engineering area and the influence of the main geological conditions. This study provides not only the profound understanding of the in-situ stress field of the Jiangranshan tunnel area, but also the implications for the fine inversion of in-situ stress field under complex geological conditions in Yunnan and other similar areas. In addition, this study can directly support the stability evaluation of the surrounding rock of the deep-buried Jiangranshan tunnel.
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表 1 水压致裂地应力测量结果
Table 1. Results of the hydraulic fracturing measurements
测段
序号测段中心
深度/m压裂参数/MPa 主应力值/MPa SH
方向PH P0 Pb Pr Ps T SH Sh Sv 1 231.50 2.31 0 4.72 3.19 2.82 1.53 9.90 5.14 6.11 2 307.00 3.07 0 10.33 6.38 5.85 3.95 17.31 8.92 8.10 3 367.00 3.67 0 11.23 7.53 6.78 3.70 20.15 10.45 9.69 N12°W 4 393.00 3.93 0 13.90 7.64 7.32 6.26 22.18 11.25 10.38 N10°W 5 414.00 4.14 0.14 10.42 4.50 6.12 5.92 22.00 10.26 10.93 
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表 2 模型材料物理力学参数表
Table 2. Physical and mechanical parameters of the materials used in the model
体序号 地层名称 岩性 密度/g·cm−3 E/GPa 泊松比 1 P1dm 灰岩 2.65 20 0.4 2 P2n 粉砂岩 2.40 18 0.35 3 C3y 灰岩 2.30 18 0.3 4 f 断层破碎带 2.10 10 0.35
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