Highway Arch Tunnel Monitoring And Measurement And Construction Mechanics

The double-arch tunnel is a kind of novel but of special structure tunnel form, it have many virtues such as: be little limited by the geography condition, have a smooth line form, the down-lead covers little, can across a wide span, the space utilization is high, have a good structure of the whole and the colligate price is low etc. However, still the application and study of the double-arch tunnel is still at the in quest and entry-level stage. Aimed at these, this article mainly does the following work:(1) Analyzed the development of the double-arch tunnel and its characteristics, then sum up the current local popular tunnel dig methods and the application range of these methods. Introduced the construction technique and craft of waterproof and draining, introduced more and in details of the waterproof and draining technique and craft at the easiest water seepage and make water part.(2) Summarized the monitoring measure project put in practice in the actual work, analysis the monitor data of the typical cross section, drew the curves variety with the time , and make some regress analysis to the constringency data, and give out the regress equations of the representative cross sections. Based upon the regress equations, forecasted the ultimate displacement.(3) Based on the measure graph of the internal force of the anchor, the internal force of the steel bolster and the stress of the wall rock. Admit that the wall rock transmutation of the side which lay aboard the middle walls is bigger during the excavating process; while using the up and down steps method to excavate the tunnel, the excavation of the down step have little influence to the transmutation of the wall rock, but have bigness influence to the transformation of the internal force measurement.(4) Introduced the theories background of the FLAC^3D. Mainly recommend some structure unit which are used in the paper for instance : the anchor unit, the steel bolster unit, the liner unit etc. Define the reasoning process of the realization process of the Mohr-Coulomb rule in FLAC. Collated FLAC and the finite element program with each characteristic.(5) Set up the three-dimension double-arch tunnel with the finite difference method, then, simulated excavation of the tunnel and the mechanical response before and after the supporting, analyzed the deformation response of the surrounding rock after different supporting structures.(6) Simulated the influence that the later excavation mutual to the precession excavation of the double-arch tunnel, compare with two different excavation methods of the double-arch tunnel, through computational analysis, show the superior and inferior of different surrounding rock model in the simulating.