某项目部承接一项直径为4.8m的隧道工程，起始里程为DK10+100，终点里程为DK10+868，环宽为1.2m，采用土压平面盾构施工，盾构隧道穿越地层主要为淤泥质黏土和粉砂土。项目施工过程中发生以下事件：事件一：盾构始发时，发现洞门处地质情况与勘察报告不符，需改变加固形式。加固施工造成工期延误10天，增加费用30万。事件二：盾构侧面下穿一座房屋后，由于项目部设定的盾构土仓压力过低，造成房屋最大沉降达到50mm，穿越后房屋沉降继续发展，项目部采用二次注浆进行控制。最终房屋出现裂缝，维修费用为40万。事件三：随着盾构逐渐进入全断面粉砂层，出现掘进速度明显下降现象，并且刀盘扭矩和总推力逐渐增大，最终停止盾构推进。经分析为粉砂流塑性过差引起。项目部对粉砂采取改良措施后继续推进，造成工期延误5天，费用增加25万元。（区间隧道贯通后计算处平均推进速度为8环/天）
问题：
1.事件一、二、三中，项目部可索赔的工期和费用各是多少？说明理由。
2.事件二中，二次注浆应采用什么浆液？
3.事件三中，采用何种材料可以改良粉砂的流塑性？
4.整个隧道掘进的完成时间是多少天？（写出计算过程）
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