【摘要】：針對(duì)王市嶺隧道隧改路工程,采用探地雷達(dá)檢測(cè)襯砌壁后空洞,并進(jìn)行鉆孔取芯驗(yàn)證,結(jié)果表明探地雷達(dá)用于壁后空洞檢測(cè)可行且具有較高的可信度。為系統(tǒng)分析壁后空洞對(duì)隧道結(jié)構(gòu)的影響,基于現(xiàn)場(chǎng)原位測(cè)試數(shù)據(jù),建立了連拱隧道的三維快速拉格朗日有限差分模型。數(shù)值分析結(jié)果表明,拱頂、拱肩和邊墻部位的空洞均會(huì)導(dǎo)致襯砌局部產(chǎn)生拉壓應(yīng)力集中,應(yīng)力集中程度受空洞位置與尺寸的雙重影響。在豎向地應(yīng)力為主的條件下,拱肩部位的空洞對(duì)襯砌危害最大,易導(dǎo)致拱肩上側(cè)部位出現(xiàn)較大的應(yīng)力集中,因此在隧道壁后空洞病害檢測(cè)時(shí)應(yīng)重點(diǎn)考慮拱肩部位。
[Abstract]:Aiming at the tunnel modification project of Wangshiling tunnel, ground penetrating radar (GPR) is used to detect the hole behind the lining wall, and the coring test is carried out. The results show that the GPR is feasible and has high reliability in the detection of the hole behind the wall. A three-dimensional fast Lagrangian finite-difference model of multi-arch tunnel is established based on in-situ test data to systematically analyze the influence of post-wall cavity on tunnel structure. The results of numerical analysis show that the cavity in arch roof, arch shoulder and side wall will cause local stress concentration of lining, and the degree of stress concentration will be affected by the location and size of the cavity. Under the condition that the vertical ground stress is dominant, the cavity in the arch shoulder is the most harmful to the lining, and it is easy to cause the stress concentration to appear in the upper side of the arch shoulder. Therefore, the arch shoulder part should be taken into account in the detection of the cavity disease behind the tunnel wall.
【作者單位】： 同濟(jì)大學(xué)巖土及地下工程教育部重點(diǎn)實(shí)驗(yàn)室;同濟(jì)大學(xué)地下建筑與工程系;浙江公路水運(yùn)工程咨詢公司;
【分類號(hào)】：U457

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