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王    姣

 

（ 河北醫(yī)科大學第四醫(yī)院 ，河北 石家莊 050051)

摘   要 ：在城市地下基坑開挖過程中， 由于地下水和工程地質(zhì)條件的影響 ，普通注漿材料對破碎巖體地層  的加固效果較差 。本次研究利用改性聚氨酯粘合劑對普通快硬性水泥注漿材料進行改良 ，室內(nèi)制備了改性聚氨酯／水泥基新型復合注漿材料 ，并對其展開了綜合試驗研究。研究表明：(1)  摻入改性聚氨酯粘合劑后，注漿材  料的擴散半徑和抗壓強度會逐漸降低，但流動性及承載能力依然在良好的范圍內(nèi) ；新型復合注漿材料的初凝時  間和終凝時間得到了大幅改善 ，不同 MP 材料濃度條件下，新型盾構(gòu)注漿漿液初凝時間分別為 21  min、18 min、12 min、10 min 以及 8. 5 min ,  終凝時間則分別為 117min、91 min、66 min、57 min以及42 min;   (2) 隨著 MP 材料濃度的增大，碎石土注漿結(jié)石體試樣的滲透性逐漸減小。利用純水泥注漿材料注漿加固的結(jié)石體試樣的滲透系數(shù)為 2. 01× 10-9 cm · s- 1 ,  隨著 MP 材料濃度的逐漸增大，結(jié)石體的滲透系數(shù)分別降低到 1 . 79× 10-9 cm · s- 1 、 1 . 68× 10-9 cm · s- 1 、1 . 61× 10-9 cm · s- 1 以及 1 . 55× 10-9 cm · s- 1 ; (3) 當養(yǎng)護時間較短時 ，新型復合注漿材料對碎  石體的加固效果不斷增強 ，結(jié)石體的抗壓強度和抗折強度也不斷提高，而當養(yǎng)護時間足夠長時， 隨著 MP 材料濃度的不段增大，結(jié)石體的抗壓強度和抗折強度均呈現(xiàn)出先增大后減小的變化趨勢。

關鍵詞 ：改性聚丙烯粘合劑 ；富水 ；破碎巖體 ；注漿材料 ；基坑加固

中圖分類號 ：TU045           

文獻標志碼 ：A            

文章編號 ：1005- 8249  (2023)   03- 0006- 05

 DOI : 10. 19860/j . cnki . issn1005- 8249. 2023 . 03 . 006

WANG Jiao

( The Fourth Hospital of Hebei Medical University ,   Shijiazhuang China ,  050051)

Abstract: During the excavation of urban underground foundation pit, due to the influence of groundwater and engineering geological conditions, the reinforcement effect of ordinary grouting materials on the broken rock stratum is poor. In this study, modified polyurethane adhesive was used to improve the ordinary quick hardening cement grouting material, and a new type of modified polyurethane/cement-based composite grouting material was prepared indoor, and a comprehensive experimental study was carried out on it. The results show that: (1) after adding modified polyurethane adhesive, the diffusion radius and compressive strength of grouting materials will gradually decrease, but the fluidity and bearing capacity are still in a good range; The initial setting time and final setting time of the new composite grouting material have been greatly improved. Under different MP material concentrations, the initial setting time of the new shield grouting slurry is 21 min, 18 min, 12 min, 10 min and 8.5 min respectively, and the final setting time is 117 min, 91 min, 66 min, 57 min and 42 min respectively; (2) With the increase of MP material concentration, the permeability of gravel soil grouting stone sample decreases gradually. The permeability coefficient of the stone sample reinforced by pure cement grouting material is 2.01 × 10-9 cm · s-1, with the gradual increase of MP material concentration, the permeability coefficient of stone body decreases to 1.79 × 10-9 cm·s-1、1.68 × 10-9 cm·s-1、1.61 × 10-9 cm · s-1 and 1.55 × 10-9 cm·s-1； (3) When the curing time is short, the strengthening effect of the new composite grouting material on the gravel body is continuously enhanced, and the compressive strength and flexural strength of the stone body are also continuously improved. When the curing time is long enough, the compressive strength and flexural strength of the stone body will increase first and then decrease with the increase of MP material concentration.

   Keywords :  modified polypropylene adhesive ;  rich water;  broken rock mass ;  grouting materials ;  foundation pit reinforcement

 

作者簡介 ：王姣  (1989—) ,  女，本科，工程師 ，主要從事醫(yī)院基建項目質(zhì)量 、進度管理工作。

收稿日期 ：2022- 11 - 01