本文選題：盾構(gòu)隧道 + 水下巖溶��； 參考：《巖土工程學(xué)報》2017年10期

【摘要】：開發(fā)了一種水下巖溶注漿材料抗分散性質(zhì)測試裝置,能科學(xué)評價注漿漿液的抗分散性質(zhì)。利用該裝置進行了改性黏土水泥膏漿充填水下巖溶的抗分散性質(zhì)試驗,采用留存率指標對漿液在不同水固比、巖溶水流速下的抗分散性質(zhì)進行了定量評價,并對留存體進行物理力學(xué)性能測試。試驗表明,改性黏土水泥膏漿抗分散性能受漿液水固比、巖溶充填物及巖溶水流速等因素影響明顯,在不大于0.8 m/s的巖溶水流速下漿液抗分散性能良好,隨著漿液水固比或巖溶水流速的減小,漿液留存率呈增大趨勢,而充填物的存在會顯著提高漿液的留存率。取留存體進行物理力學(xué)性能測試,留存體密實度受充填物影響較大,漿液水固比次之,巖溶水流速影響較小;動水巖溶環(huán)境下注漿時,漿液順水擴散距離大于逆水擴散距離,漿液黏度對擴散距離影響明顯,巖溶水流速有利于漿液沿順水流方向擴散而抑制漿液沿逆水流方向擴散;留存體28 d抗壓強度受抗沖條件影響明顯,影響因素中充填物對留存體的抗壓強度影響最大,其次為漿液水固比和巖溶水流速,巖溶水養(yǎng)護環(huán)境下28 d抗壓強度明顯小于淡水環(huán)境養(yǎng)護,但仍可達3 MPa。經(jīng)工程應(yīng)用原型試驗表明,改性黏土水泥膏漿可用于一定巖溶水流速下的巖溶區(qū)治理,室內(nèi)試驗提出的水下巖溶治理工程漿液配比選取原則可行,可為盾構(gòu)隧道水下巖溶注漿治理提供理論指導(dǎo)。
[Abstract]:A testing device for the anti-dispersion property of underwater karst grouting material is developed, which can scientifically evaluate the anti-dispersion property of grouting fluid.The anti-dispersion property of modified clay cement paste filling underwater karst was tested by this device. The anti-dispersion property of slurry under different water / solid ratio and karst water velocity was evaluated quantitatively by using retention rate index.The physical and mechanical properties of the retention material were tested.The test results show that the anti-dispersion performance of modified clay cement paste is obviously affected by the factors such as water / solid ratio, karst filling material and karst water velocity, and the anti-dispersion performance of the slurry is good at the flow rate of less than 0.8 m / s of karst water.With the decrease of slurry water / solid ratio or karst water flow rate, the slurry retention rate increases, and the existence of filling material can significantly improve the slurry retention rate.The physical and mechanical properties of the retention body were tested. The density of the retention body was influenced by the filling material, the water / solid ratio of slurry was the second, and the velocity of karst water was less. When grouting was carried out in the dynamic karst environment, the diffusion distance of the slurry along the water was larger than the diffusion distance of the reverse water.The viscosity of slurry has an obvious effect on the diffusion distance, the velocity of karst water is favorable to the diffusion of the slurry along the direction of downstream water flow, and the diffusion of slurry along the direction of reverse flow is inhibited, and the compressive strength of the retention body is obviously affected by the impact conditions on the compressive strength of the slurry for 28 days.Among the influencing factors, the filling had the greatest influence on the compressive strength of the retention body, followed by the slurry water / solid ratio and the karst water velocity. The compressive strength in the karst water maintenance environment for 28 days was obviously lower than that in the fresh water environment, but it could still reach 3 MPA.The prototype test shows that the modified clay cement paste can be used to control the karst area at a certain velocity of karst water, and the principle of selecting the proportion of slurry in the underwater karst treatment project proposed by laboratory test is feasible.It can provide theoretical guidance for underwater karst grouting treatment of shield tunnel.
【作者單位】： 中南大學(xué)土木工程學(xué)院;長沙理工大學(xué)水利學(xué)院;中鐵十四局集團隧道工程有限公司;
【基金】：國家自然科學(xué)基金項目(51279019) 中國電力投資集團公司重大科技計劃項目(2011-036-WLDKJ-X) 中南大學(xué)中央高�；究蒲袠I(yè)務(wù)費專項資金項目(2016zzts075)
【分類號】：U455.43
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本文編號：1757245