Affected by material type, construction technology, construction quality and late external environmental load, urban underground comprehensive pipe corridor is prone to structural cracks, leakage and other diseases. Based on a water-rich strata integrated pipe corridor project in Jinan City, this paper carried out the detection and analysis of the health state of the structure of the pipe corridor project, and identified the disease characteristics of the structure mainly vertical cracks. On this basis, ABAQUS finite element software was used to simulate and analyse the cracking response law of the structural sidewalls under different concrete linear expansion coefficients and pipe section casting lengths, and reveal the distribution pattern of the sidewall cracks and the stress evolution characteristics. Finally, a new modified epoxy repair plugging material was developed and proposed. Through uniaxial compression test and dry-wet bonding test of the new material, the repair mechanism of the new material to the cracks of concrete structure was revealed, and the plugging application of pipe corridor cracks was carried out in the field. The research results of this paper can provide some theoretical and technical references for the prevention and control of structural cracks in the integrated pipe corridor in water-rich strata.

This study proposed the numerical simulation method of full-length prestressed anchor grouting support based on the post-grouting technology, and the modification of the embedded PILE structural unit in FLAC^3D software. Specifically, we conducted the numerical simulation and made comparison in terms of the control effect of roadway surrounding rock under six types of factors: ground stress, strength grade of original rock, length of supporting members, layout spacing, grouting strengthening index and prestress, with the aim to reveal how these factors affect the deformation of surrounding rock and the evolution of plastic zone. Then, we proposed the sensitivity evaluation index of control effect under full-length prestressed anchor grouting support. The influencing factors are divided into 3 levels: strength of surrounding rock, ground stress and design of bolt-grouting support members. Suggestions for engineering are also given according to the sensitivity level of each factor. Finally, the combined high-strength grouting bolt and high-strength hollow grouting cable are developed based on a typical roadway in weak broken strata. It can effectively enhance the self-carrying capacity of weak broken surrounding rock, give full play to the supporting potential of anchoring members, and limit the deformation and failure of roadway surrounding rock. Through the field application, the full-length prestressed bolt-grouting support is verified.