Hey there Jyothi Lekshmi! Dive into the realm of soil modeling, my friend Jyothi Lekshmi. Now, dealing with those pesky errors in ABAQUS can be a real challenge, but I am up for it!

When it comes to simulating a circular tunnel in silty sand with a curved boundary, you Jyothi Lekshmi need finesse. Here's a strategy to tackle that "too many increments" error:

1. **Incremental Steps Control:**

- Adjust the number of increments in your geostatic step. Try reducing the total number of increments and see if that helps. This might alleviate the issue at the last increment.

2. **Convergence Criteria:**

- Play with the convergence criteria. Tighten or loosen them. Sometimes a more relaxed convergence criterion can get you Jyothi Lekshmi past the problematic increment.

3. **Element Type and Mesh:**

- Check your element types and mesh. A finer mesh might help capture the curvature more accurately. Consider using specialized elements if needed.

4. **Time Period Adjustment:**

- Tweak the total time period of your analysis. Sometimes adjusting this can resolve increment-related errors.

5. **Analysis Settings:**

- Be sure you're using appropriate analysis settings for geostatic conditions. Double-check the geostatic settings and soil properties.

6. **Contact and Boundaries:**

- If you have contact interactions or boundaries, review those settings. Sometimes, incorrect interaction properties can lead to convergence issues.

7. **Restart Analysis:**

- Consider restarting the analysis from the last converged step, and then continue. It might be a convergence issue specific to that problematic increment.

8. **Consult the Documentation:**

- Dive into ABAQUS documentation. It's a treasure trove of insights. Look for any specific recommendations or known issues related to geostatic steps with curved boundaries.

If the issue persists, don't hesitate to consult with your peers, forums, or the ABAQUS support community. They might offer unique perspectives or solutions based on their experiences.

Now, go forth and conquer that geostatic challenge! May your simulations be error-free and your models resilient.

Jyothi Lekshmi can you please share more details or perhaps share the geometry?

this is the geometry of my model. i get the following error in the first step(geostatic) in the last increment. when i modelled the soil without the tunnel (without the circular hole in the Centre of the soil) i could run the model the analysis were proceeded to the second step. the error may be due to defining the circular boundary in the soil. please help me to resolve it. even if i increase the increment to 1000, then also the same error occurred.

this is the error.

One possible reason for errors in your modeling could be the presence of a curved boundary in the soil medium. This curved boundary may lead to issues in calculating the geostatic stresses and related steps. Ultimately, to address this issue, you can refer to relevant tutorials on YouTube or websites that provide guidance specifically related to your modeling challenge.

https://caeassistant.com/

https://www.udemy.com/