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为加深在加筋土领域的研究和解决土的强度降低问题,基于对上海及周边地区的实地考察,选择了区域存有量较大的两种筋材——棕榈和麦秸秆作为土体加筋材料。试验结果表明:(1)麦秸秆丝加筋土其无侧限抗压强度试验:适宜加筋率和加筋长度分别为0.8%和15 mm。在适宜的加筋条件下,麦秸秆加筋土的无侧限抗压强度与素土相比略有提高。(2)棕榈加筋土无侧限抗压强度试验:棕榈为纤维状,同样,以同量加筋率和加筋长度作为影响因素,在相同的试验条件和试件尺寸下,适宜加筋率为0.8%,适宜加筋长度为15 mm。与素土相比,棕榈纤维明显提高了土的无侧限抗压强度和抗变形性能。(3)无侧限抗压强度试验确定棕榈与麦秸秆都可以改良土的抗压强度以及抗变形性能,并且棕榈加筋土的抗压强度与抗变形能力与麦秸秆加筋土相比,强度提高更明显。棕榈加筋土的应力应变关系曲线表现为应变强化型,破坏时试件的整体性依然很好;麦秸秆的应力应变关系曲线为应变软化型,应力峰值过后,随着应变的增加,应力迅速减小。因此,棕榈与麦秸秆均适宜作上海地区粘土的加筋材料,并且棕榈加筋效果优于麦秸秆。
In order to deepen the research in the field of reinforced earth and solve the problem of reducing the strength of soil, based on the field investigation in Shanghai and the surrounding areas, two kinds of tendons with large regional reserves, palm and wheat straw, were selected as soil Rib material. The experimental results show that: (1) The unconfined compressive strength test of wheat straw filament reinforced soil shows that the suitable reinforcement ratio and reinforcement length are 0.8% and 15 mm, respectively. Under the appropriate conditions of reinforcement, the unconfined compressive strength of wheat straw reinforced soil is slightly higher than that of plain soil. (2) Unconfined compressive strength test of palm-reinforced soil: The palm is fibrous. Similarly, with the same amount of reinforcement and the length of stiffener as the influencing factors, under the same test conditions and specimen sizes, The rate is 0.8%, suitable reinforcement length of 15 mm. Compared with plain soil, palm fibers significantly increase the unconfined compressive strength and deformation resistance of soil. (3) unconfined compressive strength test to determine the palm and wheat straw can improve the compressive strength and deformation resistance of soil, and the compressive strength and deformation resistance of palm-reinforced soil compared with wheat straw reinforced soil, Increased strength more pronounced. The stress-strain curve of the palm-reinforced soil shows strain-hardening type, and the integrity of the specimen is still good when the stress is applied. The stress-strain curve of wheat straw is strain-softening type. After the stress peak, with the increase of strain, Decrease Therefore, palm and wheat straw are suitable for the reinforcement material of clay in Shanghai, and the effect of palm reinforcement is better than wheat straw.