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地下工程开挖的安全性贯穿始末,开挖前的地质物探可以帮助人们了解掌握工程前方的地质情况,高密度电法是较为普遍的方法之一,可以通过岩石的电阻率不同从而得到上层覆土的厚度以及工程前方的地质情况。在施工过程中,通过有限差分软件FLAC3D对方斗山隧道围岩稳定性进行分析,可以得到不同施工工序下围岩的应力与变形规律。结果表明,开挖后初期支护可以减轻围岩的应力集中现象及降低变形量,拱顶部的最大应力由未支护时的3.98 MPa降低到3.71 MPa,拱顶最大位移由35.9 mm减少为29.6 mm。可以指导施工适时地加强支护,采取相应的措施,确保施工及人员的安全。
The safety of underground excavation runs through the whole process. The geophysical exploration before excavation can help people understand the geological situation in front of the project. High-density electrical method is one of the more common methods. The upper resistive soil can be obtained by different resistivity of rock The thickness and the geological conditions in front of the project. During the construction process, the stability of the surrounding rock of Doosan Tunnel is analyzed by FLAC3D finite element software, and the stress and deformation law of surrounding rock under different construction procedures can be obtained. The results show that the initial support after excavation can reduce the stress concentration and reduce the deformation of the surrounding rock. The maximum stress at the dome decreases from 3.98 MPa to 3.71 MPa when unsupported and the maximum displacement decreases from 35.9 mm to 29.6 mm mm. It can guide the construction timely and strengthen support and take appropriate measures to ensure the safety of construction and personnel.