为研究预应力筋设计参数、轴压比、后浇混凝土厚度等关键参数对模块化混凝土双舱综合管廊结构整体受力性能的影响，采用ABAQUS有限元软件建立单舱管廊有限元模型并通过试验验证该模型的合理性。在此基础上建立混凝土双舱综合管廊的整体结构模型，开展有限元参数分析，主要参数包括截面平均预压应力（0.1、0.2、0.3 MPa）、侧壁轴压比（0、0.05、0.10）、中壁轴压比（0、0.1、0.2）、预应力筋布置方式及后浇混凝土厚度（20、30、40、50 mm）等。研究结果表明： 1）截面平均预压应力的提升对结构延性有显著影响，与截面平均预压应力为0.1 MPa相比，截面平均预压应力为0.2 MPa和0.3 MPa的结构延性提升约8.3%和13.3%； 2）轴压力对结构的承载力有一定影响，当轴压比为0.05和0.10时，整体结构的承载力相比无轴压力结构提升约5.0%和10.4%； 3）截面平均预压应力不变的情况下，顶板多设置预应力筋可以提高结构的延性，底板多设置预应力筋对结构的延性产生不利影响； 4）后浇混凝土厚度对结构的受力性能影响不大，差别在2%以内。
Herein, the effects of prestressed reinforcement design parameters, axial compression ratio, and post-cast concrete thickness on the overall mechanical performance of the structure of a concrete modular double-cabin utility tunnel are investigated. A finite element model of the single-cabin tunnel is developed using ABAQUS finite element software. Based on this model, a structural model of the concrete double-cabin utility tunnel is established, and a parametric finite element analysis is conducted. The key parameters include the average sectional precompression stress (0.1, 0.2, and 0.3 MPa), sidewall axial compression ratio (0, 0.05, and 0.10), midwall axial compression ratio(0, 0.1, and 0.2) prestressed tendon arrangement, and post-cast concrete thickness (20, 30, 40, and 50 mm). The main findings are as follows: (1) An increase in average sectional precompression stress significantly enhances the structural ductility. Compared with an average sectional precompression stress of 0.1 MPa, the ductility improves by approximately 8.3% and 13.3% at 0.2 MPa and 0.3 MPa, respectively. (2) Axial pressure influences the structural bearing capacity. When the axial compression ratio is 0.05 and 0.10, the overall bearing capacity increases by approximately 5.0% and 10.4%, respectively, relative to the structure without axial pressure. (3) Under constant average sectional precompression stress, increasing the prestressed tendons in the top slab improves structural ductility, whereas increasing the prestressed tendons in the bottom slab reduces it. (4) The thickness of post-cast concrete has a limited effect on structural performance, with an improvement of no more than 2%.
