【摘要】：節(jié)理的存在降低了巖體的完整性和連續(xù)性,對(duì)隧道圍巖的穩(wěn)定具有重要影響,若支護(hù)不及時(shí)或強(qiáng)度不夠?qū)?huì)嚴(yán)重威脅施工安全。本文依托井岡山特長(zhǎng)隧道,提出了基于三維重構(gòu)、塊體理論的隧道圍巖穩(wěn)定性快速分析方法,動(dòng)態(tài)反饋、指導(dǎo)設(shè)計(jì)施工方案優(yōu)化。針對(duì)中風(fēng)化砂巖、Ⅳ級(jí)圍巖區(qū)段,通過(guò)地質(zhì)素描與統(tǒng)計(jì)分析,建立基于節(jié)理特征的三維重構(gòu)地層模型;運(yùn)用塊體理論,分析隧道開(kāi)挖時(shí)臨空面關(guān)鍵塊體分布、失穩(wěn)形式及安全系數(shù);提出圍巖穩(wěn)定性動(dòng)態(tài)反饋方法,并對(duì)比分析不同支護(hù)方案。研究表明:開(kāi)挖后圍巖穩(wěn)定性較差,必須采取相應(yīng)的支護(hù)措施,根據(jù)動(dòng)態(tài)反饋明確在實(shí)際施工時(shí)必須嚴(yán)格按照原設(shè)計(jì)方案施作錨桿支護(hù)�；谌S重構(gòu)的圍巖穩(wěn)定性快速分析及動(dòng)態(tài)反饋,可以實(shí)現(xiàn)施工過(guò)程中地質(zhì)數(shù)據(jù)的動(dòng)態(tài)采集、分析與反饋,及時(shí)依據(jù)實(shí)際開(kāi)挖地層條件,動(dòng)態(tài)調(diào)整支護(hù)體系,確保結(jié)構(gòu)的經(jīng)濟(jì)安全性。
[Abstract]:The existence of joints reduces the integrity and continuity of rock mass, and has an important effect on the stability of surrounding rock. If the support is not timely or the strength is not enough, the construction safety will be seriously threatened. Based on the Jinggangshan extra long tunnel, this paper puts forward a fast analysis method of surrounding rock stability based on 3D reconstruction and block theory, dynamic feedback to guide the optimization of design and construction scheme. Based on geological sketch and statistical analysis, a three-dimensional reconstruction stratigraphic model based on joint characteristics is established for the middle weathered sandstone and grade 鈪，

本文編號(hào)：2162803