市區內的建築物彼此緊密林立，地下管線複雜密布，可以有效達到液化防治之目的且不擾民之工法相對有限。而滲透灌漿工法對於土層結構的干擾非常小，屬於地盤改良工法中常見且可以應用於大面積範圍的灌漿方式。故本研究以滲透灌漿工法作為液化防治之對策，使用本研究研發之甲基丙烯酸甲酯(MMA)改性之不飽和聚酯樹脂(UP)混合溶液作為高分子化學材料灌漿液，藉由各項常見應用於灌漿液性質檢測之試驗探討此項高分子化學材料灌漿液之基本性能。於相同土壤體積情況下，比較1.5倍和3倍砂土孔隙體積灌漿量注入之改良土樣試體的物理性質差異，並以小型模擬砂箱灌注試驗觀測改良土體於含水砂土層中之實際膠結硬固情形，以及透過振動台砂箱液化試驗觀察作為附加載重物之民房模型與灌漿液改良土材質基礎模型於疏鬆含水砂土層液化後之沉陷及傾倒行為，作為化學灌漿液對於液化抵抗成效之佐證。各項試驗結果皆顯示UP-MMA灌漿液具有優良之工作性與止水性，滲透灌漿改良後之砂土皆具備大於40 MPa之單壓強度，並且能有效抵抗膨潤之影響，能夠使地盤改良的效果同時滿足液化防治與土壤承載力提升，達到永久性地盤改良之目的。

The buildings in the urban area are closely connected with each other, and the underground pipelines are complex and dense. There are relatively limited construction methods that can effectively achieve the purpose of soil liquefaction prevention and control without disturbing the residents. The permeation grouting method has very little interference with the soil structure. It is also a common grouting method for the ground improvement method which can be applied to a large area. Therefore, this study uses the permeation grouting method as a countermeasure for soil liquefaction prevention, and uses the methyl methacrylate (MMA) modified unsaturated polyester resin (UP) mixed solution developed in this study as the polymer chemical grouting solution. The basic performance of this polymer chemical grouting solution is explored by various tests commonly used in the detection of grouting solution properties. In the case of the same soil volume, the difference in physical properties of the improved soil samples injected with 1.5 times and 3 times the sand pore volume grouting volume were compared. The actual cementation and hardening of the improved soil in the loose water-contain sand layer were observed by a grouting test in the small-scale simulated sandbox. And then, through the soil liquefaction test by shaking table test, the subsidence and dumping behavior of the residential house model and the grouting-solution-improved soil material foundation model as additional loads were observed after the loose water-contain sand layer liquefied, as the evidence of the effectiveness of chemical grouting solution on liquefaction resistance. All of the test results show that the UP-MMA grouting solution has excellent workability and waterproof performance. All the sand sample improved by permeation grouting has a uniaxial compressive strength greater than 40 MPa and has effective resistance to the influence of swelling. Using UP-MMA grouting by permeation grouting can make the effect of ground improvement satisfy the liquefaction prevention and soil bearing capacity improvement at the same time, achieving the purpose of permanent site improvement.

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