CAJ | 학술논문

厦(门)深(圳)铁路梁山隧道穿越L7富水软弱带使施工严重受阻。为确保隧道顺利通过L7富水软弱带，通过多种经济、技术比选，最终确定通过超前预加固措施改良地层条件后，采用十字交叉隔壁后拆式工法施工。阐述十字交叉隔壁后拆式工法的特点及施工工序，同传统CRD工法相比，该工法的最大特点是：“后拆式”的十字交叉临时支撑体系，确保在临时支撑体系拆除时，初期支护和二次衬砌已经同时承载，避免传统工法中因拆撑时应力释放导致的初期支护结构失稳风险，确保施工过程中的安全可靠性。然后通过数值计算和力学分析方法，对十字交叉隔壁后拆式工法在施工过程中的支护力学转换体系进行详细分析，得出以下结论：初期支护与临时支撑组成的支护体系，在开挖的每一步中，都是承载的主体，尽可能早地闭合成环；二次衬砌的闭合时机就是二次衬砌的支护时间，以初期支护极限位移的60％作为施工二次衬砌的位移指导值较为合理。
하(문)심(수)철로량산수도천월L7부수연약대사시공엄중수조。위학보수도순리통과L7부수연약대，통과다충경제、기술비선，최종학정통과초전예가고조시개량지층조건후，채용십자교차격벽후탁식공법시공。천술십자교차격벽후탁식공법적특점급시공공서，동전통CRD공법상비，해공법적최대특점시：“후탁식”적십자교차림시지탱체계，학보재림시지탱체계탁제시，초기지호화이차츤체이경동시승재，피면전통공법중인탁탱시응력석방도치적초기지호결구실은풍험，학보시공과정중적안전가고성。연후통과수치계산화역학분석방법，대십자교차격벽후탁식공법재시공과정중적지호역학전환체계진행상세분석，득출이하결론：초기지호여림시지탱조성적지호체계，재개알적매일보중，도시승재적주체，진가능조지폐합성배；이차츤체적폐합시궤취시이차츤체적지호시간，이초기지호겁한위이적60％작위시공이차츤체적위이지도치교위합리。
During the construction of Liangshan tunnel on Xiamen to Shenzhen railway crossing L7 rich water weak stripe area, the working processes are obstructed heavily. In order to assure tunnelling safely through the area, comparisons are made economically and technically before the adoption of the post-dismantled decussated diaphragm method until the improvement of the stratum condition by advance strengthening measures. The characteristics and construction procedures of post-dismantled decussated diaphragm method are explained in this paper. Compared with the traditional CRD method, its greatest characteristic is “post-dismantled” decussated temporary support system. When temporary support is dismantled, the surrounding rock load is supported with primary support and second lining at the same time to avoid instability resulted in the release of dismantling supporting stress of the primary support structure in traditional method, and ensure the safety and reliability in the process of construction. The supporting mechanics conversion system of post-dismantled decussated diaphragm method in construction process is studied with numerical calculation and mechanics analysis. Conclusions show that the main bearing structure is the support system comprised of primary support and temporary support and the support system should be shaped in circular section as soon as possible; the time for closing the second lining is the time for supporting the second lining; and 60% of the primary support limit displacement is taken reasonably to guide the second lining displacement.