Bài viết sử dụng phương pháp mô hình số 3D bằng phần mềm Abaqus để mô phỏng quá trình thi công đường hầm và dự báo ảnh hưởng của giá trị áp lực gương đào đến độ lún mặt đất. | Nghiên cứu ảnh hưởng của áp lực gương đào đường hầm đến độ lún mặt đất khi thi công đường hầm bằng máy khiên đào Journal of Mining and Earth Sciences Vol. 61 Issue 1 2020 28 - 36 Study of the influence of face pressure on surface settlements by shield tunneling Thai Ngoc Do 1 Toan Duc Do 2 1 Faculty of Civil Engineering Hanoi University of Mining and Geology Vietnam 2 Power Engineering Consulting Joint Stock Company 4 Vietnam ARTICLE INFO ABSTRACT Article history In the mechanized excavation of subway tunnels the shield tunnel boring Received 18th Nov 2019 machine TBM has been developed in recent decades for managing the Accepted 9th Jan. 2020 instability of the excavation profile in complicated geotechnical Available online 28th Feb. 2020 conditions in urban areas. The paper presents a 3D simulation procedure Keywords for the detailed description of TBM via the finite element code Abaqus Tunnel and quantifies the influence of TBM face pressure on ground surface Shield tunneling machines settlements. The model is used to calculate ground surface settlements for different values of TBM face pressure. An additional aspect of the Face pressure investigation is the determination of the critical value of TBM face Surface settlements. pressure which controls face instability in very weak ground. During the advancement of shield tunnel boring machines the face-stabilizing pressure is one of the most important factors of critical. In tunneling by shield tunnel boring machines high face pressure often leads to surface upheaval whereas low face pressure leads to sudden collapse of the face and ultimately settlement of the surface. For the model condition the maximum value was quantity 250 kPa and the minimum value obtained quantity 150 KPa. Copyright 2020 Hanoi University of Mining and Geology. All rights reserved. Corresponding author E-mail dongocthai@ DOI 1 .04 28 Tạp chí Khoa học Kỹ thuật Mỏ - Địa chất Tập 61 Kỳ 1
