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针对云南某基坑支护工程资金有限、工期短等特点,对原基坑支护预应力锚杆复合土钉墙进行如下改进:对于预应力锚杆复合土钉墙的腰梁,在满足其受力要求的前提下,将传统的梯形腰梁改为近似三角形腰梁,并利用混凝土护面将其覆盖;对基坑的东侧支护,采用同一排中预应力锚杆和土钉间隔布置的复合土钉墙技术,从而在保证基坑支护体系质量和安全的前提下,节约了工程造价、缩短了工期。并根据后期监测结果,验证了本基坑支护改进优化设计的有效性、可靠性和实用性,为类似基坑支护工程设计提供一定的参考。
In view of the limited funds and short construction period of a foundation pit supporting project in Yunnan, the improvement of the prestressed anchor composite soil nailing wall of the original foundation pit is as follows: For the lumbar beam of the prestressed anchor composite soil nailing wall, Under the premise of force requirements, the traditional trapezoidal waist beam is changed to approximate triangular waist beam, and covered with concrete cover; the east side of the pit support, using the same row of prestressed anchor and soil nail interval Arrangement of soil nail wall technology, so as to ensure the quality and safety of foundation pit support system premise, saving construction costs and shorten the construction period. According to the result of post-monitoring, the validity, reliability and practicability of the improved design of foundation pit support are verified, which can provide reference for the design of similar foundation pit support engineering.