【摘要】：節(jié)理的存在降低了巖體的完整性和連續(xù)性,對隧道圍巖的穩(wěn)定具有重要影響,若支護不及時或強度不夠?qū)䥽乐赝{施工安全。本文依托井岡山特長隧道,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,動態(tài)反饋、指導設(shè)計施工方案優(yōu)化。針對中風化砂巖、Ⅳ級圍巖區(qū)段,通過地質(zhì)素描與統(tǒng)計分析,建立基于節(jié)理特征的三維重構(gòu)地層模型;運用塊體理論,分析隧道開挖時臨空面關(guān)鍵塊體分布、失穩(wěn)形式及安全系數(shù);提出圍巖穩(wěn)定性動態(tài)反饋方法,并對比分析不同支護方案。研究表明:開挖后圍巖穩(wěn)定性較差,必須采取相應(yīng)的支護措施,根據(jù)動態(tài)反饋明確在實際施工時必須嚴格按照原設(shè)計方案施作錨桿支護�；谌S重構(gòu)的圍巖穩(wěn)定性快速分析及動態(tài)反饋,可以實現(xiàn)施工過程中地質(zhì)數(shù)據(jù)的動態(tài)采集、分析與反饋,及時依據(jù)實際開挖地層條件,動態(tài)調(diào)整支護體系,確保結(jié)構(gòu)的經(jīng)濟安全性。
[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：2162803