论文部分内容阅读
采用探地雷达对顶管顶进中管节壁后触变泥浆进行探测,通过对雷达探测图像的数据处理及解译测得触变泥浆的相对介电常数,获得管节壁后触变泥浆套的分布状况。结果表明:管节壁后泥浆套厚度并非均匀一致,但沿顶进方向能够形成致密的泥浆套且其厚度为理论建筑空隙厚度的8~17倍,而实际施工中泥浆套厚度为建筑空隙的6~7倍时即能达到同样的减摩效果,本次雷达探测能够优化顶管施工质量;此外,通过与盾构隧道管片壁后注浆进行对比发现:电磁波在顶管触变泥浆中的传播速度明显小于其在盾构隧道浆液的传播速度,浆液的含水量及水化速度是影响电磁波在介质中传播速度的关键。
Using GPR to detect the thixotropic mud in the pipe jacking wall, the relative dielectric constant of the thixotropic mud was measured by data processing and interpretation of the radar detection image to obtain the thixotropic mud Set of distribution. The results show that the thickness of the mud jacket after the pipe wall is not uniform, but the dense mud jacket can be formed along the heading direction, and the thickness of the mud jacket is 8 to 17 times of the theoretical construction. However, the actual thickness of the mud jacket is the construction void 6 to 7 times that is able to achieve the same anti-friction effect, this radar detection can optimize the quality of pipe jacking; In addition, by contrast with shield tunneling pipe wall grouting found: electromagnetic waves in the pipe thixotropic mud Is significantly less than its propagation velocity in the shield tunnel slurry. The water content of the slurry and the hydration rate are the key factors affecting the propagation speed of the electromagnetic wave in the medium.