Stability Analysis for the Expansive Soil Slope Considering the Influence of Cracks Based on the Upper Bound Method

Xie, Canrong; Shen, Qian; Wu, Zhiwen; Zhao, Yanlin; Mei, Guoxiong

doi:10.1088/1755-1315/189/2/022014

Cited by 4 publications

(2 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Wang et al [9] made a local physical model to assess the stability evaluation of the expansive soil slope in the An Kang area. Xie et al [10] developed a stability analysis method based on the upper bound theory of limit analysis to consider the crack effect for the expansive soil slope. Based on the fuzzy recognition theory and the analytic hierarchy process (AHP), Jian et al [11] worked out a recognition model to evaluate the stability of expansive soil slopes.…”

Section: Introductionmentioning

confidence: 99%

Reliability Analysis of Expansive Soil Slope Stability Based on the Three-Broken Line Model

Wang

Zuo

et al. 2021

Mathematical Problems in Engineering

View full text Add to dashboard Cite

Based on the characteristics of an expansive soil slope, the slip mass can be simplified to a simpler model with three-broken line rigid bodies. A solution was formulated to calculate the safety factors of the slope, and the results are similar to those based on the strength reduction method. However, similar to conventional methods to analyze the stability of slopes, the deterministic method to obtain the safety factors only calculates the safety factor using deterministic values without considering the randomness of soil parameters, which leads to unstable results. To improve the rationality of the calculated results, this paper aims to construct a reliability analysis method based on the simplified three-broken line model of a landslide. The reliability is calculated with the response surface method in a spreadsheet with efficiency and convenience. The designed program considers the changes in the strength of the shallow soil and the depth of the strongly weathered layer for different stages of the wetting-drying cycles and solves for the probability of failure of the sliding surface at the interface between the strong and weak weathered layers. Considering an expansive soil slope as an example, the reliability of the slope was analyzed based on laboratory test data and the proposed formula. The results show that multiple wetting-drying cycles significantly increase the probability of failure of an expansive soil slope and that the slope typically becomes unstable after six wetting-drying cycles. Slope cutting helps alleviate the adverse effects of wetting-drying cycles.

show abstract

Section: Introductionmentioning

confidence: 99%

Reliability Analysis of Expansive Soil Slope Stability Based on the Three-Broken Line Model

Wang

Zuo

et al. 2021

Mathematical Problems in Engineering

View full text Add to dashboard Cite

show abstract

“…Akhirnya, retakan dapat membentuk bagian dari permukaan bidang gelincir yang tidak memiliki kekuatan geser. Xie (2018), retakan akan membentuk saluran yang besar saat curah hujan tinggi, yang dapat meningkatkan kedalaman infiltrasi dan tekanan air.…”

unclassified

Pengaruh Hujan Terhadap Stabilitas Lereng Dengan Retakan Pada Tanah Kohesif

Muchtaranda

Sulistyowati

Muhajirah

2022

View full text Add to dashboard Cite

Banyak kejadian lereng longsor pada saat hujan lebat atau sesaat setelah hujan reda. Hal ini dikarenakan air hujan berinfiltrasi ke dalam tanah, sehingga tanah menjadi jenuh, tekanan air pori di dalam tanah meningkat dan terjadinya tekanan air lateral pada retakan. Sehingga kekuatan tanah berkurang, dan akibatnya terjadi peristiwa longsor. Salah satu penyebab air hujan cepat berinfiltrasi ke dalam tanah adalah adanya retakan (crack) pada permukaan tanah, baik pada permukaan tanah datar maupun pada bagian yang miring dari suatu lereng tanah. Retakan dapat terjadi karena sifat kembang susut tanah, kegiatan pembangunan oleh manusia, penurunan tanah tidak seragam dan masih banyak penyebab lainnya. Pada penelitian ini, lereng dimodelkan dengan retakan pada puncak lereng dengan jarak 5 m dan variasi kedalaman 5 m dan 10 m. Lereng juga dipengaruhi hujan dengan variasi intensitas sebesar 0,2 mm/jam pada intensitas yang sering terjadi; 4,2 mm/jam pada intensitas rata-rata dan 33,3 mm/jam pada intensitas maksimum dengan durasi hujan 1,2,3 dan 4 hari. Hasil analisis menunjukkan bahwa semakin tinggi intensitas hujan, semakin lama durasi hujan dan semakin dalam retakan, maka perubahan muka air tanah, tekanan air pori dan tekanan lateral air di retakan semakin besar, mengakibatkan semakin menurunnya angka faktor keamanan dari lereng.

show abstract